Structure of 40963-14-2
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CAS No. : | 40963-14-2 |
Formula : | C6H14N2O |
M.W : | 130.19 |
SMILES Code : | C(C(=O)N)(N)(C(C)C)C |
MDL No. : | MFCD02682920 |
InChI Key : | YCPQUHCGFDFLSI-UHFFFAOYSA-N |
Pubchem ID : | 9793773 |
GHS Pictogram: |
![]() |
Signal Word: | Warning |
Hazard Statements: | H302-H315-H319-H335 |
Precautionary Statements: | P261-P305+P351+P338 |
Num. heavy atoms | 9 |
Num. arom. heavy atoms | 0 |
Fraction Csp3 | 0.83 |
Num. rotatable bonds | 2 |
Num. H-bond acceptors | 2.0 |
Num. H-bond donors | 2.0 |
Molar Refractivity | 36.61 |
TPSA ? Topological Polar Surface Area: Calculated from |
69.11 Ų |
Log Po/w (iLOGP)? iLOGP: in-house physics-based method implemented from |
1.31 |
Log Po/w (XLOGP3)? XLOGP3: Atomistic and knowledge-based method calculated by |
-0.22 |
Log Po/w (WLOGP)? WLOGP: Atomistic method implemented from |
-0.15 |
Log Po/w (MLOGP)? MLOGP: Topological method implemented from |
-0.01 |
Log Po/w (SILICOS-IT)? SILICOS-IT: Hybrid fragmental/topological method calculated by |
-0.55 |
Consensus Log Po/w? Consensus Log Po/w: Average of all five predictions |
0.08 |
Log S (ESOL):? ESOL: Topological method implemented from |
-0.38 |
Solubility | 54.7 mg/ml ; 0.42 mol/l |
Class? Solubility class: Log S scale |
Very soluble |
Log S (Ali)? Ali: Topological method implemented from |
-0.77 |
Solubility | 21.9 mg/ml ; 0.168 mol/l |
Class? Solubility class: Log S scale |
Very soluble |
Log S (SILICOS-IT)? SILICOS-IT: Fragmental method calculated by |
-0.33 |
Solubility | 60.5 mg/ml ; 0.465 mol/l |
Class? Solubility class: Log S scale |
Soluble |
GI absorption? Gatrointestinal absorption: according to the white of the BOILED-Egg |
High |
BBB permeant? BBB permeation: according to the yolk of the BOILED-Egg |
No |
P-gp substrate? P-glycoprotein substrate: SVM model built on 1033 molecules (training set) |
No |
CYP1A2 inhibitor? Cytochrome P450 1A2 inhibitor: SVM model built on 9145 molecules (training set) |
No |
CYP2C19 inhibitor? Cytochrome P450 2C19 inhibitor: SVM model built on 9272 molecules (training set) |
No |
CYP2C9 inhibitor? Cytochrome P450 2C9 inhibitor: SVM model built on 5940 molecules (training set) |
No |
CYP2D6 inhibitor? Cytochrome P450 2D6 inhibitor: SVM model built on 3664 molecules (training set) |
No |
CYP3A4 inhibitor? Cytochrome P450 3A4 inhibitor: SVM model built on 7518 molecules (training set) |
No |
Log Kp (skin permeation)? Skin permeation: QSPR model implemented from |
-7.25 cm/s |
Lipinski? Lipinski (Pfizer) filter: implemented from |
0.0 |
Ghose? Ghose filter: implemented from |
None |
Veber? Veber (GSK) filter: implemented from |
0.0 |
Egan? Egan (Pharmacia) filter: implemented from |
0.0 |
Muegge? Muegge (Bayer) filter: implemented from |
1.0 |
Bioavailability Score? Abbott Bioavailability Score: Probability of F > 10% in rat |
0.55 |
PAINS? Pan Assay Interference Structures: implemented from |
0.0 alert |
Brenk? Structural Alert: implemented from |
0.0 alert: heavy_metal |
Leadlikeness? Leadlikeness: implemented from |
No; 1 violation:MW<1.0 |
Synthetic accessibility? Synthetic accessibility score: from 1 (very easy) to 10 (very difficult) |
1.22 |
* All experimental methods are cited from the reference, please refer to the original source for details. We do not guarantee the accuracy of the content in the reference.
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
82% | In methanol; water; | EXAMPLE 8 Preparation of 2-butyl-4-methyl-4-(2-methylethyl)-imidazolidin-5-one 20.0 g of <strong>[40963-14-2]2-amino-2,3-dimethylbutyramide</strong> (>96%, 0.147 mol.) are dissolved at room temperature in 100 ml of H2 O and 50 ml of methanol and mixed with 13.2 g of valeraldehyde (0.152 mol.). The mixture is heated for 2.5 hours at 70 C. The two-phase mixture is extracted three times at room temperature using 200 ml of MIBK each time, and the combined organic phases are concentrated in vacuo. 25.3 g (97.8% (cis/trans mixture: 25:72; no assignment) of a white solid were obtained, corresponding to a yield of 82% of the theoretical yield. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
With potassium tert-butylate; In toluene; | EXAMPLE 2 PREPARATION OF 5-FORMYL-2-(4-ISOPROPYL-4-METHYL-5-OXO-2-IMIDAZOLIN-2-YL)-6-METHYLNICOTINIC ACID, 5-(DIMETHYL ACETAL) STR11 Potassium tert-butoxide (1.39 g, 12.4 mmol) is added to a stirred solution of dimethyl 5-formyl-6-methyl-2,3-pyridinedicarboxylate, 5-(dimethyl acetal) (1.93 g, 6.2 mmol) and <strong>[40963-14-2]2-amino-2,3-dimethylbutyramide</strong> (0.81 g, 6.2 mmol) in toluene (25 mL). The reaction is heated at 80 C. for 1 hour, cooled to room temperature and diluted with water (20 mL). The layers are separated and the aqueous solution acidified to pH 3.0 with 2N hydrochloric acid. The aqueous solution is extracted with methylene chloride (3*30 mL), the extracts dried over anhydrous magnesium sulfate and concentrated in vacuo to give the title compound as an orange solid (1.56 g, 4.5 mmol, 72% yield), mp 147-150 C., identified by IR and NMR spectral analyses. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
With hydrogenchloride; In potassium tert-butylate; water; toluene; | STR9 To a mixture of 98.8 g (0.415 mole) of diethyl 2-methylpyrimidine-4,5-dicarboxylate (compare, for example, J. Heterocycl. Chem. 2, 202-204 [1965]) and 54.0 g (0.415 mole) of <strong>[40963-14-2]2-amino-2,3-dimethylbutyramide</strong> in 700 ml of anhydrous toluene there are added in portions 102.2 g (0.913 mole) of potassium tert.-butylate, and the mixture is subsequently stirred for 16 hours at 80 C. For working-up, the reaction mixture is cooled, the solid which has precipitated is filtered, washed several times with diethyl ether and subsequently dissolved in water. The aqueous solution is brought to pH 5 using half-concentrated hydrochloric acid, and the mixture is extracted five times using 200 ml portions of dichloromethane. The combined organic extracts are dried over sodium sulphate and concentrated in vacuo. The residue can be purified by chromatography on silica gel. 59 g (51% of theory) of 2-methyl-4-(4-methyl-4-isopropylimidazolin-5-on-2-yl)-pyrimidine-5carboxylic acid of melting point 56-57 C. are obtained. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
In tetrahydrofuran; sodium hydroxide; water ethanol; acetic anhydride; | EXAMPLE 82 Preparation of 6-(4-isopropyl-4-methyl-5-oxo-2-imidazolin-2-yl)-1H-1-methyl-pyrazolo-[3,4-b]pyridine-5-carboxylic acid STR168 Diethyl-1-methyl-1H-pyrazolo[3,4-b]pyridine-5,6-dicarboxylate (24 g) in 200 mL of 1:1 ethanol-water is heated as reflux overnight, then concentrated on a rotary evaporator. The residue is acidified to pH 1 with 6N HCl, cooled and filtered to remove the solid diacid product, which is then washed with cold water and air dried. The yielde is (32%) of crude diacid mp 228-229 C. (dec). The diacid (9 g) in acetic anhydride (40 mL) is stirred at 85-90 C. for two hours. The reaction mixture is filtered while hot and the filtrate is concentrated under reduced pressure to yield the crude anhydride as a gum. The product is dissolved in tetrahydrofuran (50 mL), <strong>[40963-14-2]2-amino-2,3-dimethylbutyramide</strong> is then added and the mixture is stirred while heating to 40 C. for one and one-half hours and then at reflux for 16 hours. Upon completion of the reaction, the mixture is cooled to room temperature and concentrated in vacuo. The residue is dissolved in aqueous NaOH (10 g/100 mL), 100 mL) and the resulting solution is stirred at 75-85 C. for four hours. After cooling to room temperature the reaction mixture is cooled to 10 C. and acidified to pH 2 with concentrated hydrochloric acid. The resulting precipitate is collected by filtration, dried and purified by column chromatography on silica gel utilizing ethyl acetate-ethanol on the eluant to give the title product as a tan solid having a melting point 239-243 C. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
67% | With sodium hydroxide; sulfuric acid; In tetrahydrofuran; | EXAMPLE 68 Synthesis of 5-Ethyl-2-(5-isopropyl-5-methyl-4-oxo-2-imidazolin-2-yl) Nicotinic Acid from 5-EPDC Anhydride 2-Amino-2,3-dimethylbutyramide (0.80 g, 6.1 mmol) was added to a solution of 5-ethylpyridine-2,3-dicarboxylic acid anhydride (1.02 g, 5.80 mmol) in anhydrous tetrahydrofuran (8 mL). The reaction mixture was stirred for 24 hours at room temperature under nitrogen and concentrated under reduced pressure to afford light brown material. Sodium hydroxide (6M solution, 8 mL) was added to the brown residue and stirred for four hours at 70 C. The reaction mixture was cooled to room temperature and sulfuric acid was added (3M solution, 7 mL) to bring pH to 8.76. The reaction mixture was extracted twice with diethyl ether (25 mL each). The organic extracts were discarded. The sulfuric acid was added to the aqueous layer to bring the pH to 3.0, upon which the product precipitated as white crystals. The product, 5-ethyl-2-(5-isopropyl-5-methyl-4-oxo-2-imidazolin-2-yl), was filtered and dried (1.12 g, 67% yield). The product was characterized by proton NMR. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
In acetic acid; toluene; | EXAMPLE 8 Preparation of 6-(thiophen-3-yl)-2-(5-isopropyl-5-methyl-4-oxo-imidazol-2-yl)-pyridine-3-carboxylic acid STR44 12 g of potassium tert.-butoxide are added to a solution of 14 g of 6-(thiophen-3-yl)-pyridine-2,3-dicarboxylic acid diethyl ester and 6 g of 2-amino-2,3-dimethyl- butyramide in 100 ml of dry toluene while stirring and the solution is heated at 80 C. for 5 hours. The reaction solution is then poured onto ice, the phases are separated and the aqueous phase is acidified with 10 ml of glacial acetic acid. After some time the above acid crystallises out and is filtered off with suction and dried. In this manner 13.5 g of 6-(thiophen-3-yl)-2-(5-isopropyl-5-methyl-4-oxo-imidazol-2-yl)-pyridine-3-carboxylic acid having a melting point of 253-257 C. are obtained. The 6-(thiophen-3-yl)-pyridine-2,3-dicarboxylic acid diethyl ester required as starting material is prepared as follows: |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
With potassium tert-butylate; In toluene; | EXAMPLE 12 PREPARATION OF 5-FORMYL-2-(4-ISOPROPYL-4-METHYL-5-OXO-2-IMIDAZOLIN-2-YL)NICOTINIC ACID, 5-(DIMETHYL ACETAL) STR22 Potassium tert-butoxide (26.55 g, 0.236 mol) is added portionwise to a stirred solution of 5-formyl-2,3-pyridinedicarboxylic acid, dimethyl ester, 5-dimethyl acetal (30.31 g, 0.112 mol) and <strong>[40963-14-2]2-amino-2,3-dimethylbutyramide</strong> (14.67 g, 0.113 mol) in toluene, the reaction mixture exotherms to about 40 C. The reaction mixture is heated at 80 C. for 1 hour, cooled to room temperature and diluted with water. The layers are separated and the aqueous solution is acidified to pH 3.0 with concentrated hydrochloric acid. The aqueous solution is then extracted with methylene chloride and the combined methylene chloride extracts are dried over anhydrous magnesium sulfate and concentrated in vacuo to give the title compound as a tan solid, (32.12 g, 85%), mp 135-139 C., identified by IR and NMR spectral analyses. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
With sodium methylate; In methanol; ethanol; hexane; | EXAMPLE 5 Preparation of 6-cyclopropyl-2-(5-isopropyl-5-methyl-4-oxoimidazolin-2-yl)-pyridine-3-carboxylic acid STR41 10 g of 30% sodium methoxide in methanol are added to a solution of 6 g of 6-cyclopropylpyridine-2,3-dicarboxylic acid diethyl ester and 3 g of <strong>[40963-14-2]2-amino-2,3-dimethylbutyramide</strong> in 100 ml of ethanol and the reaction mixture is boiled under reflux for 3 hours. It is then concentrated, the residue is dissolved in a small amount of water, and the solution is saturated with sodium chloride. The pH is then adjusted to 4 with concentrated hydrochloric acid and the solution is extracted three times with 150 ml of ethyl acetate each time. The organic phase is dried over magnesium sulphate, filtered and concentrated. The residue crystallises from ether/hexane 1:2. In this manner 4 g of 6-cyclopropyl-2-(5-isopropyl-5-methyl-4-oxoimidazolin-2-yl)-pyridinecarboxylic acid having a melting point of 118-121 are obtained. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
In tetrahydrofuran; | EXAMPLE 16 Preparation of 2-(N-2-methyl-valylamide)-carbamoyl-6-phenoxymethyl-nicotinic acid STR57 13 g of 2-methyl-valinamide are added to a solution of 2.55 g of 6-phenoxymethylpyridine-2,3-dicarboxylic acid in 30 ml of tetrahydrofuran while stirring and the reaction mixture is further stirred for 14 hours at room temperature before being concentrated by evaporation. An oily residue remains, which is purified by crystallisation from ether/petroleum ether. 3.4 g of white crystals having a melting point of 108-110 are obtained. The 2-carbamoyl-nicotinic acid derivatives of formula VIII listed in Tables 8.00 to 8.02 are prepared in a manner analogous to that described in Example 16. STR58 |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
57% | With potassium tert-butylate; In water; toluene; | EXAMPLE 23 PREPARATION OF 5-(1,3-DIOXEPAN-2-YL)-2-(4-ISOPROPYL-4-METHYL-5-OXO-2-IMIDAZOLIN-2-YL)NICOTINIC ACID STR36 5-(1,3-Dioxepan-2-yl)-2,3-pyridinedicarboxylic acid, dimethyl ester (0.9 g, 0.00305 mol) in toluene is added to <strong>[40963-14-2]2-amino-2,3-dimethylbutyramide</strong> (0.4 g, 0.00305 mol) and potassium tert-butoxide (0.69 g, 0.0061 mol) in toluene. The mixture is heated for 3 hours from 60 to 70 C. The reaction mixture is cooled to room temperature, water is added and the mixture is concentrated in vacuo to give an oil. The oil is diluted with water and washed with ether. The aqueous solution is acidified to pH 3.1 with 2 normal hydrochloric acid solution and extracted with methylene chloride. The combined methylene chloride extracts are dried over anhydrous magnesium sulfate and concentrated in vacuo to give the title compound as a white solid (0.63 g, 57%) mp 60-69 C., identified by IR and NMR spectral analyses. Following the above procedure and substituting the appropriate formula I 2,3-pyridinedicarboxylate, the following formula II compounds are obtained. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
100% | With ammonium chloride; potassium tert-butylate; In chloroform; toluene; | EXAMPLE 24 PREPARATION OF 5-(1-ACETYL-3-METHYL-2-IMIDAZOLIDINYL)-2-(4-ISOPROPYL-4-METHYL-5-OXO-2-IMIDAZOLIN-2-YL)NICOTINIC ACID AMMONIUM SALT STR38 To a stirred solution of dimethyl 5-(1-acetyl-3-methyl-2-imidazolidinyl)pyridine-2,3-dicarboxylate (0.70 g, 0.0022 mol), and 2-amino-2,3dimethylbutyramide (0.28 g, 0.0022 mol) in toluene (10 mL) is added potassium tert-butoxide (0.49 g, 0.0044 mol). The resulting mixture is stirred for 2 hours at 80 C. to 90 C. After cooling to room temperature, the reaction is quenched by the addition of water (15 mL) and ammonium chloride (0.25 g). The layers are separated, the aqueous solution concentrated under high vacumn, the product triturated with 33% ethanol in chloroform and filtered. The filtrate is concentrated in vacuo to afford the title compound (0.95 g, 100%) as a gold solid, mp 93-98 C., identified by IR and NMR spectral analyses. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
In tetrahydrofuran; | EXAMPLE 5 Preparation of intermediate 2-[(1-carbamoyl-1,2-dimethylpropyl)carbamoyl]-3-quinolinecarboxylic acid A solution of 2,3-quinolinedicarboxylic anhydride (0.37 mol) in tetrahydrofuran (THF, 250 mL) is stirred at 5 C. under a drying tube, and a solution of <strong>[40963-14-2]2-amino-2,3-dimethylbutyramide</strong> (0.37 mol) in THF (50 mL) added thereto, in small increments, over a 15 minute period. The reaction mixture is allowed to warm slowly to room temperature for an extended period of time, i.e. about 17 hours. The solvent is evaporated in vacuo to afford a gummy residue, which is triturated with hot ethyl acetate (400 mL) and then filtered to afford the desired 2-[(1-carbamoyl-1,2-dimethylpropyl)carbamoyl]-3-quinolinecarboxylic acid, mp 172.5-173.5 C. | |
In tetrahydrofuran; | EXAMPLE 8 Preparation of 2-[(1-carbamoyl-1,2-dimethylpropyl)-carbamoyl]-3-quinolinecarboxylic acid A solution of 2,3-quinolinedicarboxylic anhydride (0.037 mol) in tetrahydrofuran (THF, 250 mL) is stirred at 5 C. under a drying tube, and a solution of <strong>[40963-14-2]2-amino-2,3-dimethylbutyramide</strong> (0.037 mol) in THF (50 mL) added thereto, in small increments, over a 15 minute period. The reaction mixture is allowed to warm slowly to room temperature for an extended period of time, i.e. about 17 hours. The solvent is evaporated in vacuo to afford a gummy residue, which is triturated with hot ethyl acetate (400 mL) and then filtered to afford the desired 2-[(1-carbamoyl-1,2-dimethylpropyl)-carbamoyl]-3-quinolinecarboxylic acid, mp 172.5-173.5 C. | |
In tetrahydrofuran; | EXAMPLE 8 Preparation of 2-[(1-carbamoyl-1,2-dimethylpropyl)carbamoyl]-3-quinolinecarboxylic acid A solution of 2,3-quinolinedicarboxylic anhydride (0.037 mol) in tetrahydrofuran (THF, 250 ml) is stirred at 5 C. under a drying tube, and a solution of <strong>[40963-14-2]2-amino-2,3-dimethylbutyramide</strong> (0.037 mol) in THF (50 ml) added thereto, in small increments, over a 15 minute period. The reaction mixture is allowed to warm slowly to room temperature for an extended period of time, i.e. about 17 hours. The solvent is evaporated in vacuo to afford a gummy residue, which is triturated with hot ethyl acetate (400 ml) and then filtered to afford the desired 2-[(1-carbamoyl-1,2-dimethylpropyl)carbamoyl]-3-quinolinecarboxylic acid, mp 172.5-173.5 C. |
In tetrahydrofuran; | EXAMPLE 95 Preparation of 2-[(1-carbamoyl-1,2-dimethylpropyl)carbamoyl]-3-quinolinecarboxylic acid A solution of 2,3-quinolinedicarboxylic anhydride (0.037 mol) in tetrahydrofuran (THF, 250 ml) is stirred at 5 C. under a drying tube, and a solution of <strong>[40963-14-2]2-amino-2,3-dimethylbutyramide</strong> (0.037 mol) in THF (50 ml) added thereto, in small increments, over a 15 minute period. The reaction mixture is allowed to warm slowly to room temperature for an extended period of time, i.e. about 17 hours. The solvent is evaporated in vacuo to afford a gummy residue, which is triturated with hot ethyl acetate (400 ml) and then filtered to afford the desired 2-[(1-carbamoyl-1,2-dimethylpropyl)carbamoyl]-3-quinolinecarboxylic acid, mp 172.5-173.5 C. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
100% | In tetrahydrofuran; | EXAMPLE 21 PREPARATION OF 2-[(1-CARBAMOYL-1,2-DIMETHYLPROPYL)-CARBAMOYL]-5-(1,3-DIOXOLAN-2-YL)NICOTINIC ACID STR34 A solution of 5-(1,3-dioxolan-2-yl)-2,3-pyridinedicarboxylic anhydride (2.64 g, 0.012 mol) and <strong>[40963-14-2]2-amino-2,3-dimethylbutyramide</strong> (1.55 g, 0.012 mol) in tetrahydrofuran is stirred for 2 days at room temperature. The reaction mixture is concentrated in vacuo to give the title compound as an orange oil (5.4 g, 100%), identified by NMR spectra analysis. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
With triethylamine; In tetrahydrofuran; thionyl chloride; water; ethyl acetate; toluene; | EXAMPLE 10 Methyl N-(1-carbamoyl-1,2-dimethylpropyl)-6-nitrophthalamate STR56 A suspension of 4.94 g 2-methyl 3-nitrophthalate in 20 mL thionyl chloride is stirred at room temperature for 72 hours. The mixture is concentrated and the residue dissolved in toluene and again concentrated. This process is repeated. The residue (crude acid chloride) in 30 mL dry THF is added dropwise at room temperature with stirring under nitrogen to a solution containing 3.84 g <strong>[40963-14-2]2-amino-2,3-dimethylbutyramide</strong> and 4.4 mL triethylamine in 50 mL dry THF. After stirring at room temperature for 24 hours, 50 mL water and 50 mL CH2 Cl2 is added, the phases separated and the aqueous phase reextracted with 50 mL ethyl acetate. The combined organic extract is dried and concentrated. The residue is triturated with ether to give the product which is recrystallized from ethyl acetate to give the desired product with mp 100-107 C. | |
With triethylamine; In tetrahydrofuran; thionyl chloride; water; ethyl acetate; toluene; | EXAMPLE 10 Preparation of methyl N-(1-carbamoyl-1,2-dimethylpropyl)-6-nitrophthalamate STR21 A suspension of 4.94 g 2-methyl-3-nitrophthalate in 20 ml thionyl chloride is stirred at room temperature for 72 hours. The mixture is concentrated and the residue dissolved in toluene and again concentrated. This process is repeated. The residue (crude acid chloride) in 30 ml dry THF is added dropwise at room temperature with stirring under nitrogen to a solution containing 3.84 g <strong>[40963-14-2]2-amino-2,3-dimethylbutyramide</strong> and 4.4 ml triethylamine in 50 ml dry THF. After stirring at room temperature for 24 hours, 50 ml water and 50 ml CH2 Cl2 is added, the phases separated and the aqueous phase reextracted with 50 ml ethyl acetate. The combined organic extract is dried and concentrated. The residue is triturated with ether to give the product which is recrystallized from ethyl acetate to give the desired product with mp 100-107 C. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
With toluene-4-sulfonic acid; In toluene; | EXAMPLE 25 Preparation of methyl o-[N-(1-carbamoyl-1,2-dimethylpropyl)formimidoyl]benzoate STR77 A mixture containing 5.0 g methyl 2-formylbenzoate [C. Brown and M. V. Sargent, J. Chem. Soc. (C), 1818 (1969)] and 4.0 g <strong>[40963-14-2]2-amino-2,3-dimethylbutyramide</strong> and 50 mg p-toluenesulfonic acid in 100 mL toluene is heated under reflux under a Dean-Stark water separator for three hours. The mixture is filtered and concentrated in vacuo. The residue crystallizes on standing and is recrystallized from etherhexane to give analytically pure methyl o-[N-(1-carbamoyl-1,2-dimethylpropyl)formimidoyl]benzoate, mp 79-80.5 C. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
With triethylamine; In tetrahydrofuran; water; | EXAMPLE 13 Preparation of N2 -(1-carbamoyl-1,2-dimethylpropyl)-3-fluoro-N',N'-diisopropyl-4-methylphthalamide STR59 To a stirred solution of 8.18 g 6-fluoro-N,N-diisopropyl-5-methylphthalamic acid in 100 mL dry THF at -2 C. and under nitrogen is added dropwise 2.78 mL ethylchloroformate followed by 4.5 mL triethylamine. After one-half hour, there is added dropwise a solution of 3.77 g <strong>[40963-14-2]2-amino-2,3-dimethylbutyramide</strong> in 125 mL dry THF at -2 to +2 C. After the addition, the mixture is allowed to warm to room temperature and stirred for three hours. To the mixture is added 100 mL water. The organic phase is separated, washed with brine and the combined aqueous phases extracted with 100 mL ethyl acetate. The combined organic phases are dried (MgSO4) and concentrated to give a foam which is used directly in the next step. | |
With triethylamine; In tetrahydrofuran; water; | EXAMPLE 13 Preparation of N2 -(1-carbamoyl-1,2-dimethylpropyl)-3-fluoro-N',N'-diisopropyl-4-methylphthalamide STR24 To a stirred solution of 8.18 g 6-fluoro-N,N-diisopropyl-5-methylphthalamic acid in 100 mL dry THF at -2C. and under nitrogen is added dropwise 2.78 mL ethylchloroformate followed by 4.5 mL triethylamine. After one-half hour, there is added dropwise a solution of 3.77 g <strong>[40963-14-2]2-amino-2,3-dimethylbutyramide</strong> in 125 mL dry THF at -2 to +2 C. After the addition, the mixture is allowed to warm to room temperature and stirred for three hours. To the mixture is added 100 mL water. The organic phase is separated, washed with brine and the combined aqueous phases extracted with 100 mL ethyl acetate. The combined organic phases are dried (MgSO4) and concentrated to give a foam which is used directly in the next step. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
With sodium hydroxide; In tetrahydrofuran; | EXAMPLE 45 Preparation of 5-(4-isopropyl-4-methyl-5-oxo-2-imidazolin-2-yl)thieno[3,2-b]pyridine-6-carboxylic acid STR168 Thieno[3,2-b]pyridine-5,6-dicarboxylic acid (2.5 g, 0.011 mol) is heated slowly to 85 C. for one hour with acetic anhydride (25 mL), then cooled, filtered and washed with diethyl ether to give the anhydride as a solid, mp 266-267 C. A mixture of the anhydride and <strong>[40963-14-2]2-amino-2,3-dimethylbutyramide</strong> (2.6 g, 0.02 mol) in THF (70 mL) is stirred at room temperature for 15 hours. After heating at reflux for two hours, the mixture is cooled and diluted with THF (50 mL). Solid 5-[(1-carbamoyl-1,2-dimethylpropyl)carbamoyl]thieno[3,2-b]pyridine-6-carboxylic acid is filtered off, washed with ether and dried. The above solid is mixed with an aqueous 60 mL) solution of sodium hydroxide (6 g 0.05 mol) and heated at 85 C. for two hours and 30 minutes, then set aside at room temperature overnight. After cooling in an ice bath, the mixture is acidified to pH 3 with concentrated hydrochloric acid. A solid (3 g) is filtered off and dried. Crystallization from ethyl acetate affords (5-(4-isopropyl-4-methyl-5-oxo-2-imidazolin-2-yl)thieno[3,2-b]pyridine-6-carboxylic acid, mp 242-244 C. in 46% yield. Utilizing the above procedure and substituting the appropriate pyridine-5,6-dicarboxylic acid for thieno[3,2-b]pyridine-5,6-dicarboxylic acid yields the compounds illustrated below. | |
With sodium hydroxide; In tetrahydrofuran; | EXAMPLE 22 Preparation of 5-(4-isopropyl-4-methyl-5-oxo-2-imidazolin-2-yl)thieno[3,2-b]pyridine-6-carboxylic acid STR124 Thieno[3,2-b]pyridine-5,6-dicarboxylic acid (2.5 g, 0.011 mol) is heated slowly to 85 C. for one hour with acetic anhydride (25 mL), then cooled, filtered and washed with diethyl ether to give the anhydride as a solid, mp 266-267 C. A mixture of the anhydride and <strong>[40963-14-2]2-amino-2,3-dimethylbutyramide</strong> (2.6 g, 0.02 mol) in THF (70 mL) is stirred at room temperature for 15 hours. After heating at reflux for two hours, the mixture is cooled and diluted with THF (50 mL). Solid 5-[(1-carbamoyl-1,2-dimethylpropyl)carbamoyl]thieno[3,2-b]pyridine-6-carboxylic acid is filtered off, washed with ether and dried. The above solid is mixed with an aqueous 60 mL) solution of sodium hydroxide (6 g 0.05 mol) and heated at 85 C. for two hours and 30 minutes, then set aside at room temperature overnight. After cooling in an ice bath, the mixture is acidified to pH 3 with concentrated hydrochloric acid. A solid (3 g) is filtered off and dried. Crystallization from ethyl acetate affords (5-(4-isopropyl-4-methyl-5-oxo-2-imidazolin-2-yl)thieno[3,2-b]pyridine-6-carboxylic acid, mp 242-244 C. in 46% yield. Utilizing the above procedure and substituting the appropriate pyridine-5,6-dicarboxylic acid for thieno[3,2-b]pyridine-5,6-dicarboxylic acid yields the compounds illustrated below. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
In tetrahydrofuran; | EXAMPLE 44 Preparation of 5-[(1-carbamoyl-1,2-dimethylpropyl)]-3-chlorothieno[3,2-b]pyridine-6-carboxylic acid STR166 2-Amino-2,3-dimethylbutyramide (0.71 g) all in one portion is added to a stirred solution of 3-chlorothieno[3,2-b]pyridine-5,6-dicarboxylic acid anhydride, (1.2 g) in THF (1.0 mL). After standing for five minutes, the ice bath is removed and the reaction stirred at room temperature for 28 hours. THF (5 mL) is added and the mixture heated at reflux for two hours and then set aside overnight. The cooled mixture is filtered and the collected solid washed with ether to give 1.4 g of the desired 5-[(1-carbamoyl-1,2-dimethylpropyl)carbamoyl]3-chlorothieno[3,2-b]pyridine-6-carboxylic acid. Utilizing the above procedure and substituting the appropriate pyridine-5,6-dicarboxylic acid anhydride for 3-chlorothieno[3,2-b]pyridine-5,6-dicarboxylic acid anhydride and the appropriate aminoamide yields the compounds illustrated below. | |
In tetrahydrofuran; | EXAMPLE 7 Preparation of 5-(1-carbamoyl-1,2-dimethylpropyl)-3-chlorothieno[3,2-b]pyridine-6-carboxylic acid STR23 2-Amino-2,3-dimethylbutyramide (0.71 g) all in one portion is added to a stirred solution of 3-chlorothieno[3,2-b]pyridine-5,6-dicarboxylic acid anhydride, (1.2 g) in THF (1.0 mL). After standing for five minutes, the ice bath is removed and the reaction stirred at room temperature for 28 hours. The (5 mL) is added and the mixture heated at reflux for two hours and then set aside overnight. The cooled mixture is filtered and the collected solid washed with ether to give 1.4 g of the desired 5-[(1-carbamoyl-1,2-dimethylpropyl)carbamoyl]-3-chlorothieno[3,2-b]pyridine-6-carboxylic acid. Utilizing the above procedure and substituting the appropriate pyridine-5,6-dicarboxylic and anhydride for 3-chlorothieno[3,2-b]pyridine-5,6-dicarboxylic acid anhydride and the appropriate aminoamide yields the compounds illustrated below. | |
In tetrahydrofuran; | EXAMPLE 21 Preparation of 5-[(1-carbamoyl-1,2-dimethylpropyl)-carbamoyl]-3-chlorothieno[3,2-b]pyridine-6-carboxylic acid STR122 2-Amino-2,3-dimethylbutyramide (0.71 g) all in one portion is added to a stirred solution of 3-chlorothieno[3,2-b]pyridine-5,6-dicarboxylic acid anhydride, (1.2 g) in THF (1.0 mL). After standing for five minutes, the ice bath is removed and the reaction stirred at room temperature for 28 hours. THF (5 mL) is added and the mixture heated at reflux for two hours and then set aside overnight. The cooled mixture is filtered and the collected solid washed with ether to give 1.4 g of the desired 5-[(1-carbamoyl-1,2-dimethylpropyl)carbamoyl]3-chlorothieno[3,2-b]pyridine-6-carboxylic acid. Utilizing the above procedure and substituting the appropriate pyridine-5,6-dicarboxylic acid anhydride for 3-chlorothieno[3,2-b]pyridine-5,6-dicarboxylic acid anhydride and the appropriate aminoamide yields the compounds illustrated below. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
With sodium hydroxide; In tetrahydrofuran; ethanol; water; | EXAMPLE 49 Preparation of 5-[(1-carbamoyl-1,2-dimethylpropyl)carbamoyl]furo[3,2-b]pyridine-6-carboxylic acid and 5-(4-isopropyl-4-methyl-5-oxo-2-imidazolin-2-yl)furo[3,2-b]pyridine-6-carboxylic acid STR175 Furo[3,2-b]pyridine-5,6-dicarboxylic acid anhydride (3.01 g, 0.015 mol) is suspended in THF (100 mL) to which <strong>[40963-14-2]2-amino-2,3-dimethylbutyramide</strong> (2.3 g, 0.018 mol) is added. After stirring for 20 hours, the solution is stripped to an oily solid which dissolves in a water/dilute sodium hydroxide solution. The alkaline solution is extracted with methylene chloride, and then acidified and reextracted with methylene chloride but on stirring only minute traces of material is isolated. The water layer is concentrated to an oily solid which is dissolved in ethanol, filtered and concentrated to a purple gum which is predominantly the crude product, 5-[(1-carbamoyl-1,2-dimethylpropyl)carbamoyl]furo[3,2-b]pyridine-6-carboxylic acid and is used without further purification to prepare the final 2-imidazolin-2-yl product by dissolving it in 10% sodium hydroxide solution (40 mL) and warming at 80 C. for three hours. On cooling the reaction is acidified and a small amount of solid precipitated out and was filtered off. | |
With sodium hydroxide; In tetrahydrofuran; ethanol; water; | EXAMPLE 12 Preparation of 5-[(1-carbamoyl-1,2-dimethylpropyl)-carbamoyl]furo[3,2-b]pyridine-6-carboxylic acid and 5-(5-isopropyl-5-methyl-4-oxo-2-imidazolin-2-yl)furo[3,2-b]pyridine-6-carboxylic acid STR31 Furo[3,2-b]pyridine-5,6-dicarboxylic acid anhydride (3.01 g, 0.015 mol) is suspended in THF (100 mL) to which <strong>[40963-14-2]2-amino-2,3-dimethylbutyramide</strong> (2.3 g, 0.018 mol) is added. After stirring for 20 hours, the solution is stripped to an oily solid which dissolves in a water/dilute sodium hydroxide solution. The alkaline solution is extracted with methylene chloride, and then acidified and reextracted with methylene chloride but on stirring only minute traces of material is isolated. The water layer is concentrated to an oily solid which is dissolved in ethanol, filtered and concentrated to a purple gum which is predominantly the crude product, 5-[(1-carbamoyl-1,2-dimethylpropyl)carbamoyl]furo[3,2-b]pyridine-6-carboxylic acid and is used without further purification to prepare the final 2-imidazolin-2-yl product by dissolving it in 10% sodium hydroxide solution (40 mL) and warming at 80 C. for three hours. On cooling the reaction is acidified and a small amount of solid precipitated out and was filtered off. | |
With sodium hydroxide; In tetrahydrofuran; ethanol; water; | EXAMPLE 26 Preparation of 5-[(1-carbamoyl-1,2-dimethylpropyl)carbamoyl]furo[3,2-b]pyridine-6-carboxylic acid and 5-(4-isopropyl-4-methyl-5-oxo-2-imidazolin-2-yl)furo[3,2-b]pyridine-6-carboxylic acid STR131 Furo[3,2-b]pyridine-5,6-dicarboxylic acid anhydride (3.01 g, 0.015 mol) is suspended in THF (100 mL) to which <strong>[40963-14-2]2-amino-2,3-dimethylbutyramide</strong> (2.3 g, 0.018 mol) is added. After stirring for 20 hours, the solution is stripped to an oily solid which dissolves in a water/dilute sodium hydroxide solution. The alkaline solution is extracted with methylene chloride, and then acidified and reextracted with methylene chloride but on stirring only minute traces of material is isolated. The water layer is concentrated to an oily solid which is dissolved in ethanol, filtered and concentrated to a purple gum which is predominantly the crude product, 5-[(1-carbamoyl-1,2-dimethylpropyl)carbamoyl]furo[3,2-b]pyridine-6-carboxylic acid and is used without further purification to prepare the final 2-imidazolin-2-yl product by dissolving it in 10% sodium hydroxide solution (40 mL) and warming at 80 C. for three hours. On cooling the reaction is acidified and a small amount of solid precipitated out and was filtered off. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
17.35 g (72%) | In tetrahydrofuran; | EXAMPLE 54 Preparation of 6-[(1-carbamoyl-1,2-dimethylpropyl)carbamoyl]thieno[2,3-b]pyridine-5-carboxylic acid STR185 2-Amino-2,3-dimethylbutyramide (9.84 g, 0.076 mol) is added to a stirred suspension of thieno[2,3-b]pyridine-5,6-dicarboxylic acid anhydride (14.8 g, 0.072 mol) in THF under an inert atmosphere of N2 at room temperature. The dark solution is stirred at room temperature overnight and the resulting solid filtered off, washed with THF and air dried to give 17.35 g (72%) of 6-[(1-carbamoyl-1,2-dimethylpropyl)carbamoyl]thieno[2,3-b]pyridine-5-carboxylic acid. Utilizing the above procedure and substituting the appropriate substituted thieno[2,3-b]pyridine-5,6-dicarboxylic acid anhydride yields the compounds illustrated below. |
17.35 g (72%) | In tetrahydrofuran; | EXAMPLE 17 Preparation of 6-[(1-carbamoyl-1,2-dimethylpropyl)carbamoyl]thieno[2,3-b]pyridine-5-carboxylic acid STR41 2-Amino-2,3-dimethylbutyramide (9.84 g, 0.076 mol) is added to a stirred suspension of thieno[2,3-b]pyridine-5,6-dicarboxylic acid anhydride (14.8 g, 0.072 mol) in THF under an inert atmosphere of N2 at room temperature. The dark solution is stirred at room temperature overnight and the resulting solid filtered off, washed with THF and air dried to give 17.35 g (72%) of 6-[(1-carbamoyl-1,2-dimethylpropyl)carbamoyl]thieno[2,3-b]pyridine-5-carboxylic acid. Utilizing the above procedure and substituting the appropriate substituted thieno[2,3-b]pyridine-5,6-dicarboxylic acid anhydride yields the compounds illustrated below. |
17.35 g (72%) | In tetrahydrofuran; | EXAMPLE 31 Preparation of 6-[(1-carbamoyl-1,2-dimethylpropyl)carbamoyl]thieno[2,3-b]pyridine-5-carboxylic acid STR141 2-Amino-2,3-dimethylbutyramide (9.84 g, 0.076 mol) is added to a stirred suspension of thieno[2,3-b]pyridine-5,6-dicarboxylic acid anhydride (14.8 g, 0.072 mol) in THF under an inert atmosphere of N2 at room temperature. The dark solution is stirred at room temperature overnight and the resulting solid filtered off, washed with THF and air dried to give 17.35 g (72%) of 6-[(1-carbamoyl-1,2-dimethylpropyl)carbamoyl]thieno[2,3-b]pyridine-5-carboxylic acid. Utilizing the above procedure and substituting the appropriate substituted thieno[2,3-b]pyridine-5,6-dicarboxylic acid anhydride yields the compounds illustrated below. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
In tetrahydrofuran; | EXAMPLE 67 Preparation of 6-[(1-carbamoyl-1,2-dimethylpropyl)carbamoyl]-furo[2,3-b]pyridine-5-carboxylic acid STR209 2-Amino-2,3-dimethylbutyramide (2.1 g, 0.016 mol) is added to a stirred suspension of furo[2,3-b]pyridine-5,6-dicarboxylic acid anhydride (3.0 g, 0.016 mol) in tetrahydrofuran (7.5 mL) and the mixture allowed to stir at room temperature for 16 hours. The reaction mixture is then stirred at 60 C. for one hour, cooled to room temperature, ether added, and the solid filtered off and dried to give 5 g of 6-[(1-carbamoyl-1,2-dimethylpropyl)carbamoyl]furo[2,3-b]pyridine-5-carboxylic acid mp 192-196 C. (dec). | |
In tetrahydrofuran; | EXAMPLE 37 Preparation of 6-[(1-carbamoyl-1,2-dimethylpropyl)carbamoyl]-furo[2,3-b]pyridine-5-carboxylic acid STR68 2-Amino-2,3-dimethylbutyramide (2.1 g, 0.016 mol) is added to a stirred suspension of furo[2,3-b]pyridine-5,6-dicarboxylic acid anhydride (3.0 g, 0.016 mol) in tetrahydrofuran (7.5 mL) and the mixture allowed to stirr at room temperature for 16 hours. The reaction mixture is then stirred at 60 C. for one hour, cooled to room temperature, ether added, and the solid filtered off and dried to give 5 g of 6-[(1-carbamoyl-1,2-dimethylpropyl)carbamoyl]furo[2,3-b]pyridine-5-carboxylic acid mp 192-196 C. (dec). | |
In tetrahydrofuran; | EXAMPLE 44 Preparation of 6-[(1-carbamoyl-1,2-dimethylpropyl)carbamoyl]-furo[2,3-b]pyridine-5-carboxylic acid STR167 2-Amino-2,3-dimethylbutyramide (2.1 g, 0.016 mol) is added to a stirred suspension of furo[2,3-b]pyridine-5,6-dicarboxylic acid anhydride (3.0 g, 0.016 mol) in tetrahydrofuran (7.5 mL) and the mixture allowed to stir at room temperature for 16 hours. The reaction mixture is then stirred at 60 C. for one hour, cooled to room temperature, ether added, and the solid filtered off and dried to give 5 g of 6-[(1-carbamoyl-1,2-dimethylpropyl)carbamoyl]furo[2,3-b]pyridine-5-carboxylic acid mp 192-196 C. (dec). |
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