Structure of 10406-06-1
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CAS No. : | 10406-06-1 |
Formula : | C9H6BrNO2 |
M.W : | 240.05 |
SMILES Code : | C2=C(C(O)=O)C1=CC(=CC=C1[NH]2)Br |
MDL No. : | MFCD05664007 |
InChI Key : | JVZMBSGNSAHFCY-UHFFFAOYSA-N |
Pubchem ID : | 7018243 |
GHS Pictogram: |
![]() |
Signal Word: | Warning |
Hazard Statements: | H302-H315-H319-H332-H335 |
Precautionary Statements: | P261-P280-P305+P351+P338 |
Num. heavy atoms | 13 |
Num. arom. heavy atoms | 9 |
Fraction Csp3 | 0.0 |
Num. rotatable bonds | 1 |
Num. H-bond acceptors | 2.0 |
Num. H-bond donors | 2.0 |
Molar Refractivity | 52.96 |
TPSA ? Topological Polar Surface Area: Calculated from |
53.09 Ų |
Log Po/w (iLOGP)? iLOGP: in-house physics-based method implemented from |
1.36 |
Log Po/w (XLOGP3)? XLOGP3: Atomistic and knowledge-based method calculated by |
2.68 |
Log Po/w (WLOGP)? WLOGP: Atomistic method implemented from |
2.63 |
Log Po/w (MLOGP)? MLOGP: Topological method implemented from |
1.8 |
Log Po/w (SILICOS-IT)? SILICOS-IT: Hybrid fragmental/topological method calculated by |
2.54 |
Consensus Log Po/w? Consensus Log Po/w: Average of all five predictions |
2.2 |
Log S (ESOL):? ESOL: Topological method implemented from |
-3.46 |
Solubility | 0.0827 mg/ml ; 0.000344 mol/l |
Class? Solubility class: Log S scale |
Soluble |
Log S (Ali)? Ali: Topological method implemented from |
-3.45 |
Solubility | 0.0857 mg/ml ; 0.000357 mol/l |
Class? Solubility class: Log S scale |
Soluble |
Log S (SILICOS-IT)? SILICOS-IT: Fragmental method calculated by |
-3.52 |
Solubility | 0.0732 mg/ml ; 0.000305 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 |
Yes |
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) |
Yes |
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 |
-5.86 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 |
0.0 |
Bioavailability Score? Abbott Bioavailability Score: Probability of F > 10% in rat |
0.56 |
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) |
1.34 |
* 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 |
---|---|---|
100% | A flask was charged with 1-(5-bromo-1H-indol-3-yl)-2,2,2-trifluoroethanone (hb) (4.30 g, 14.72 mmol) and an aqueous solution of sodium hydroxide (180 mL, 20% wt.) was added. This mixture was refluxed for 2h30 then carefully acidified to pH = 1 with an aqueous solution of 6M HCl. During this acidification, the carboxylic acid precipitated. The resulting suspension was filtered. The solid was washed with water and dissolved in a mixture of ethyl acetate/methanol (about 9/1). The organic layer was dried over anhydrous MgSO4 and evaporated under vacuum. The desired product (2b) (3.528 g, 14.7 mmol) was obtained as a beige solid. Yield: quant. 1H NMR (300 MHz, DMSO-d6): delta = 7.30 (dd, J = 2.1 and 8.7 Hz, 1H, CH), 7.45 (d, J = 8.7 Hz, 1H, CH), 8.04 (d, J = 3.0 Hz, 1H, CH), 8.12 (d, J = 2.1 Hz, 1H, CH), 12.09 (br s, 1H, NH) ppm. 13C NMR (75.5 MHz, DMSO-d6): delta = 107.0 (C), 113.8 (CH), 114.4 (C), 122.6 (CH), 124.6 (CH), 127.8 (C), 133.4 (CH), 135.2 (C), 165.6 (CO) ppm. | |
100% | A flask was charged with 1-(5-bromo-lH-indol-3-yl)-2,2,2-trifluoroethanone (hb) (4.30 g, 14.72 mmol) and an aqueous solution of sodium hydroxide (180 mL, 20% wt.) was added. This mixture was refluxed for 2h30 then carefully acidified to pH = 1 with an aqueous solution of 6M HCl. During this acidification, the carboxylic acid precipitated. The resulting suspension was filtered. The solid was washed with water and dissolved in a mixture of ethyl acetate/methanol (about 9/1). The organic layer was dried over anhydrous MgSO4 and evaporated under vacuum. The desired product (2b) (3.528 g, 14.7 mmol) was obtained as a beige solid. Yield: quant.1H NMR (300 MHz, DMSO-d6): delta = 7.30 (dd, J = 2.1 and 8.7 Hz, 1H, CH), 7.45 (d, J = 8.7 Hz, 1H, CH), 8.04 (d, J = 3.0 Hz, 1H, CH), 8.12 (d, J = 2.1 Hz, 1H, CH), 12.09 (br s, 1H, NH) ppm. 13C NMR (75.5 MHz, DMSO-d6): delta = 107.0 (C), 113.8 (CH), 114.4 (C), 122.6 (CH), 124.6 (CH), 127.8 (C), 133.4 (CH), 135.2 (C), 165.6 (CO) ppm. | |
24 g of the compound obtained in Preparation 1.1 is added to a solution of 46.1 g of potassium hydroxide in 25 ml of water, and is heated for 4 hours under reflux. The reaction mixture is cooled and is washed with ether, The aqueous phase is cooled to 5 C. and is then neutralized with a solution of phosphate buffer preloaded with 35% hydrochloric acid. The precipitate formed is drained and is washed with water. 15.6 g of the expected compound is obtained in the form of a white powder,m.p.=234 C.1H NMR: DMSO-d6 (250 MHz): delta (ppm): 7.32 (1H, d); 7.46 (1H, d); 8.06 (1H, s); 8.14 (1H, s); 12.00/7H, br). |
2. Preparations of the compounds of formula (VIII: X = CH).Preparation 2.15-Bromo-1 /-/-indole-3-carboxylic acid(VIII): X = CH; R4 = Br; R5 = H.24 g of the compound obtained in Preparation 1 .1 is added to a solution of 46.1 g of potassium hydroxide in 25 ml of water, and is heated for 4 hours under reflux. The reaction mixture is cooled and is washed with ether. The aqueous phase is cooled to 5C and is then neutralized with a solution of phosphate buffer preloaded with 35% hydrochloric acid. The precipitate formed is drained and is washed with water. 15.6 g of the expected compound is obtained in the form of a white powder.m.p. = 234C.1H NMR: DMSO-de (250 MHz): delta (ppm): 7.32 (1 H, d); 7.46 (1 H, d); 8.06 (1 H, s); 8.14 (1 H, s); 12.00 (2H, br). | ||
With sodium hydroxide; at 55℃; | General procedure: One of compounds 3a-3f (20 mmol) was dissolved in DMF (10 mL). Trifluoroacetic anhydride (4.2 mL, 30 mmol) was added dropwise at 0C. After stirring for 3.5 h, water was added, the solid filtered off and treated with 20% NaOH (40 mL, 0.2 mol) at 55C overnight. Upon cooling down, the solution was extracted with Et2O. The aqueous phase was acidified with concentrated HCl and the residue was filtered off to give one of compounds 4a-4f. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
General procedure: The intermediatesindole-2(3)-carbohydrazide (2) and indole-3-carboxaldehyde(4) were prepared starting from commercially available indole,as described previously. Indole-3-carboxylic acids 1were prepared from the reaction of indole with trifluoroaceticanhydride followed by hydrolysis with sodium hydroxide. Toobtain the corresponding ester, a solution of indole-3-carboxylicacid 1 (1 mmol) in absolute ethanol (20 mL) was refluxed witha catalytic amount of concentrated sulfuric acid for 20 h and theresidue was extracted with ethyl acetate (30 mL), washed with asaturated sodium bicarbonate solution (20 mL), dried, andevaporated. As shown in Scheme 1, a solution of theappropriate ester (1 mmol) and hydrazine hydrate (2 mmol)in ethanol (15 mL) was refluxed for 24 h and cooled, and thesolid that was obtained was filtered and recrystallized fromethanol to give pure indole-2(3)-carbohydrazide (2) in 85-90% yield.For preparation of indole-3-carboxaldehydes 4, withcontinuous stirring, phosphorous oxychloride (8.41 mL, 90mmol) was added to 0 C dimethylformamide (28 mL, 370mmol) for 30 min followed by addition of a solution of indole 3(85.47 mmol) in DMF (10 mL, 130 mmol) at roomtemperature until it became a yellow paste. At the end of thereaction, 30 g of crushed ice was added to the paste followed bydropwise addition of a sodium hydroxide solution (1 N solution, 100 mL) while the mixture was being stirred. Theresulting suspension was heated rapidly to 90 C, cooled atroom temperature, and refrigerated overnight. The product wasfiltered, washed with water (2 × 100 mL), and air-dried toafford the pure indole-3-carboxaldehydes 4 in 80-90% yields(Scheme 1).Finally, to the mixture of indole-2(3)-carboxylic acidhydrazide 2 (1 mmol) and indole-3-carboxaldehyde 4 (1mmol) in absolute ethanol (20 mL) was added a catalyticamount of glacial acetic acid, and the mixture was refluxed at 80C for 5 h and cooled and the solid that separated out wasfiltered and recrystallized from ethanol to afford bis(indolyl)-hydrazide-hydrazones in 75-90% yields (Scheme 1). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
96% | With lithium tert-butoxide; In N,N-dimethyl-formamide; at 100℃; under 760.051 Torr; for 24h; | General procedure: In a dried two-necked test tube was charged with LiOtBu (160 mg, 2.00 mmol) and indole 1a (23.4 mg, 0.4 mmol). The reaction vessel was evacuated under high vacuum and the atmosphere was replace with a balloon of CO2. Then DMF (2 mL) was added and the mixture was stirred for 24 h at 100C. Then the result mixture was cooled and carefully quenched with a solution of HCl (2 N) and extracted with EtOAc (5x). The combined organic layers were washed with water (2x), brine (1x) and dry over MgSO4. The dried organics were concentrated under reduce pressure and the residue was purified by preparative TLC (hexane:acetone = 1:1) to afford the desired product 2a (153.0 mg, 95%) as a white solid. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
76% | With 1-ethyl-(3-(3-dimethylamino)propyl)-carbodiimide hydrochloride; In tetrahydrofuran; at 20℃; for 20h; | In a flask, the indolic amine (gb) (150 mg, 0.627 mmol) was dissolved in 10 mL of THF. To this solution, <strong>[10406-06-1]5-bromo-1H-indole-3-carboxylic acid</strong> (2b) (150 mg, 0.627 mmol) and 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide (EDCI, 107 mg, 0.690 mmol) were added. The reacting mixture was stirred for 20 hours at room temperature. The crude material was then diluted in a large amount of ethyl acetate. The organic layer was washed twice with a 1N aqueous solution of HCl and once with brine. The organic layer was dried over anhydrous MgSO4 and concentrated. The crude material was purified by flash chromatography (from EtOAc/pentane 3/7 to 1/1) to afford the desired product 4 (220 mg, 0.477 mmol) as a white solid. Yield: 76 %. Mp: 144 C. IR (ATR): 3298, 3160, 2986, 1592, 1537, 1445, 1205 cm-1. 1H NMR (400 MHz, DMSO-d6): delta = 1.61 (d, J = 6.8 Hz, 3H, CH3), 5.49-5.56 (m, 1H, CH), 7.17 (dd, J = 1.6 and 8.4 Hz, 1H, CH), 7.27 (dd, J = 2.0 and 8.8 Hz, 1H, CH), 7.32-7.41 (m, 3H, CH), 7.82 (s, 1H, CH), 8.12 (d, J = 2.4 Hz, 1H, NH), 8.16 (d, J = 8.4 Hz, 1H, CH), 8.38 (s, 1H, CH), 11.11 (br s, 1H, NH), 11.70 (br s, 1H, NH) ppm. 13C NMR (100 MHz, DMSO-d6): delta = 20.9 (CH3), 40.0 (CH), 110.2 (C), 111.0 (C), 113.0 (C), 113.3 (CH), 113.7 (CH), 118.1 (C), 121.3 (CH), 123.3 (CH), 123.4 (CH), 123.7 (CH), 124.2 (CH), 127.8 (C), 128.2 (C), 128.8 (CH), 134.7 (C), 135.0 (C), 163.2 (C) ppm. LRMS (ESI): m/z = 458, 460 and 462 [(M-H)-]. |
76% | With N-(3-dimethylaminopropyl)-N-ethylcarbodiimide; In tetrahydrofuran; at 20℃; for 20h; | In a flask, the indolic amine (gb) (150 mg, 0.627 mmol) was dissolved in 10 mL of THF. To this solution, 5-bromo-lH-indole-3-carboxylic acid (2b) (150 mg, 0.627 mmol) and l-ethyl-3- (3-dimethylaminopropyl)carbodiimide (EDCI, 107 mg, 0.690 mmol) were added. The reacting mixture was stirred for 20 hours at room temperature. The crude material was then diluted in a large amount of ethyl acetate. The organic layer was washed twice with a IN aqueous solution of HC1 and once with brine. The organic layer was dried over anhydrous MgSC^ and concentrated. The crude material was purified by flash chromatography (from EtOAc/pentane 3/7 to 1/1) to afford the desired product 4 (220 mg, 0.477 mmol) as a white solid. Yield: 76 %.Mp: 144 C. IR (ATR): 3298, 3160, 2986, 1592, 1537, 1445, 1205 cm"1. 1H NMR (400 MHz, DMSO-de): delta = 1.61 (d, J = 6.8 Hz, 3H, CH3), 5.49-5.56 (m, 1H, CH), 7.17 (dd, J = 1.6 and 8.4 Hz, 1H, CH), 7.27 (dd, J = 2.0 and 8.8 Hz, 1H, CH), 7.32-7.41 (m, 3H, CH), 7.82 (s, 1H, CH), 8.12 (d, J= 2.4 Hz, 1H, NH), 8.16 (d, J= 8.4 Hz, 1H, CH), 8.38 (s, 1H, CH), 1 1.11 (br s, IotaEta, NuEta), 11.70 (br s, 1H, NH) ppm. 13C NMR (100 MHz, DMSO-d6): delta = 20.9 (CH3), 40.0 (CH), 110.2 (C), 111.0 (C), 113.0 (C), 113.3 (CH), 113.7 (CH), 118.1 (C), 121.3 (CH), 123.3 (CH), 123.4 (CH), 123.7 (CH), 124.2 (CH), 127.8 (C), 128.2 (C), 128.8 (CH), 134.7 (C), 135.0 (C), 163.2 (C) ppm. LRMS (ESI): m/z = 458, 460 and 462 [(M-H)"]. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
61% | With 1-ethyl-(3-(3-dimethylamino)propyl)-carbodiimide hydrochloride; In tetrahydrofuran; at 20℃; | In a flask, the amine (ob) (1.13 g, 4.0 mmol) was dissolved in 50 mL of THF. To this solution, <strong>[10406-06-1]5-bromo-1H-indole-3-carboxylic acid</strong> (2b) (862 mg, 3.6 mmol) and 1-ethyl-3-(3-dimethylaminopropyl) carbodiimide (EDCI, 680 mg, 0.768 mL, 4.38 mmol) were added. The reacting mixture was stirred overnight at room temperature. The crude material was then diluted in a large amount of ethyl acetate. The organic layer was washed twice with 1N aqueous HCl solution and once with brine. The organic layer was dried over anhydrous MgSO4 and concentrated. The crude material was purified by flash chromatography (EtOAc/pentane, 1/1 then 7/3 and neat ethyl acetate) to afford the desired product 11 as a white solid. Yield: 75 %. This solid was washed with pentane to remove entirely ethyl acetate (1.10 g, 2.18 mmol). Yield: 61%. Mp: 126 C. IR (ATR): 3223, 3031, 1752, 1704, 1597, 1537, 1435, 1372, 1204 cm-1. 1H NMR (300 MHz, DMSO-d6): delta = 3.67 (s, 3H, CH3), 5.82 (d, J = 6.0 Hz, 1H, CH), 7.24 (dd, J = 1.8 and 6.6 Hz, 1H, CH), 7.28 (dd, J= 2.1 and 8.7 Hz, 1H, CH), 7.39 (d, J= 8.7 Hz, 1H, CH), 7.41 (d, J= 8.7 Hz, 1H, CH), 7.53 (d, J = 2.4 Hz, 1H, CH), 7.80 (d, J = 2.1 Hz, 1H, CH), 8.29 (d, J = 2.4 Hz, 1H, CH), 8.33 (d, J = 1.8 Hz, 1H, CH), 8.55 (d, J= 6.0 Hz, 1H, NH), 11.41 (br s, 1H, NH), 11.78 (br s, 1H, NH) ppm. 13C NMR (75.5 MHz, DMSO-d6): delta = 49.3 (CH), 51.9 (OCH3), 108.9 (C), 109.0 (C), 111.6(C), 113.2 (C), 113.6 (CH), 113.8 (CH), 121.2 (CH), 123.2 (CH), 123.9 (CH), 124.4 (CH), 126.5 (CH), 127.7 (C), 128.2 (C), 130.1 (CH), 134.7 (C), 134.9 (C), 164.2 (C), 171.6 (C) ppm. LRMS (ESI): m/z = 502, 504 and 506 [(M-H)-]. |
61% | With N-(3-dimethylaminopropyl)-N-ethylcarbodiimide; In tetrahydrofuran; at 20℃; | In a flask, the amine (ob) (1.13 g, 4.0 mmol) was dissolved in 50 mL of THF. To this solution, 5-bromo-lH-indole-3-carboxylic acid (2b) (862 mg, 3.6 mmol) and l-ethyl-3-(3- dimethylaminopropyl) carbodiimide (EDCI, 680 mg, 0.768 mL, 4.38 mmol) were added. The reacting mixture was stirred overnight at room temperature. The crude material was then diluted in a large amount of ethyl acetate. The organic layer was washed twice with IN aqueous HCl solution and once with brine. The organic layer was dried over anhydrous MgSC>4 and concentrated. The crude material was purified by flash chromatography (EtOAc/pentane, 1/1 then 7/3 and neat ethyl acetate) to afford the desired product 11 as a white solid. Yield: 75 %. This solid was washed with pentane to remove entirely ethyl acetate (1.10 g, 2.18 mmol). Yield: 61%. Mp: 126 C. IR (ATR): 3223, 3031, 1752, 1704, 1597, 1537, 1435, 1372, 1204 cm"1. 1H NMR (300 MHz, DMSO-de): delta = 3.67 (s, 3H, CH3), 5.82 (d, J = 6.0 Hz, 1H, CH), 7.24 (dd, J = 1.8 and 6.6 Hz, 1H, CH), 7.28 (dd, J= 2.1 and 8.7 Hz, 1H, CH), 7.39 (d, J= 8.7 Hz, 1H, CH), 7.41 (d, J = 8.7 Hz, 1H, CH), 7.53 (d, J = 2.4 Hz, 1H, CH), 7.80 (d, J = 2.1 Hz, 1H, CH), 8.29 (d, J = 2.4 Hz, 1H, CH), 8.33 (d, J = 1.8 Hz, 1H, CH), 8.55 (d, J= 6.0 Hz, 1H, NH), 1 1.41 (br s, 1H, NH), 1 1.78 (br s, 1H, NH) ppm. 13C NMR (75.5 MHz, DMSO-d6): delta = 49.3 (CH), 51.9 (OCH3), 108.9 (C), 109.0 (C), 111.6(C), 113.2 (C), 113.6 (CH), 113.8 (CH), 121.2 (CH), 123.2 (CH), 123.9 (CH), 124.4 (CH), 126.5 (CH), 127.7 (C), 128.2 (C), 130.1 (CH), 134.7 (C), 134.9 (C), 164.2 (C), 171.6 (C) ppm. LRMS (ESI): m/z = 502, 504 and 506 [(M-H)"]. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
72% | With N-(3-dimethylaminopropyl)-N-ethylcarbodiimide; In tetrahydrofuran; at 20℃; for 20h; | In a flask, the 2-amino-2-(lH-indol-3-yl)ethyl]carbamic acid tert-butyl ester (la) (150 mg, 0.545 mmol) was dissolved in 8 mL of THF. To this solution, 5-bromo-lH-indole-3-carboxylic acid (2b) (131 mg, 0.545 mmol) and l-ethyl-3-(3-dimethylaminopropyl)carbodiimide (EDCI, 110 mu?,, 0.599 mmol) were added. The reacting mixture was stirred during 20 hours at room temperature and then diluted in a large amount of EtOAc (30 mL). The organic layer was washed twice with IN aqueous HCl then once with brine, dried over anhydrous MgS04 and then evaporated under vacuum. The resulting crude material was purified by flash chromatography (EtOAc/pentane, 1/1 then 3/7) to afford the desired product 3c (195 mg, 0.392 mmol) as a white solid. Yield: 72%.Mp: 183 C (EtOAc/pentane). 1H NMR (300 MHz, MeOD): delta = 1.35 (s, 9H), 3.60-3.74 (m, 2H), 5.62-5.66 (m, 1H), 6.99-7.05 (m, 1H), 7.08-7.13 (m, 1H), 7.25-7.31 (m, 4H), 7.71-7.74 (m, 1H), 7.91 (s, 1H), 8.32 (s, 1H) ppm. 13C NMR (75.5 MHz, MeOD): delta = 28.7 (C(CH3)3), 45.7 (CH2), 48.6 (CHN), 80.3 (C(CH3)3), 111.7, 112.4, 114.4, 115.4, 119.9, 120.1, 122.7, 123.2, 124.7, 126.3, 127.7, 129.2, 130.2, 136.7, 138.3, 159.1, 167.6 ppm. IR: 3374, 3309, 1728, 1652, 1626, 1533, 1455, 1371, 1355, 1293, 1256, 1166, 739.cm_1. LRMS (ESI): m/z = 519 and 521 [(M+Na)+]. HRMS (ESI) calcd for C24H25 403Br a: 519.1002 and 521.0985. Found: 519.1004 and 521.0982 [(M+Na)+]. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
68% | With N-(3-dimethylaminopropyl)-N-ethylcarbodiimide; In tetrahydrofuran; at 20℃; for 20h; | In a flask, the [2-amino-2-(5-bromo-lH-indol-3-yl)ethyl]carbamic acid tert-butyl ester (lb) (60 mg, 0.169 mmol) was dissolved in 5 mL of THF. To this solution, 5-bromo-lH-indole-3- carboxylic acid (2b) (41 mg, 0.169 mmol) and l-ethyl-3-(3-dimethylaminopropyl)carbodiimide (EDCI, 33 mu?, 0.186 mmol) were added. The reacting mixture was stirred for 20 hours at room temperature. The homogeneous crude material was then diluted in a large amount of ethyl acetate (30 mL). The organic layer was washed twice with IN aqueous HCl and once with brine. The organic layer was dried over anhydrous MgS04 and concentrated. The crude material was purified by flash chromatography (EtOAc/pentane, 1/1 then 3/7) to afford the desired product 3f (67 mg, 0.116 mmol) as a white solid. Yield: 68%. Mp: 225 C (EtOAc/pentane). 1H NMR (300 MHz, MeOD): delta = 1.35 (s, 9H), 3.56-3.71 (m, 2H), 5.55-5.59 (m, 1H), 7.18 (dd, J = 1.8 and 8.6 Hz, 1H), 7.25-7.34 (m, 4H), 7.89-7.92 (m, 2H), 8.31 (br s, 1H) ppm. 13C NMR (75.5 MHz, MeOD): delta = 28.7 (C(CH3)3), 45.6 (CH2), 48.3 (CHN), 80.3 (C(CH3)3), 111.6, 113.3, 114.0, 114.3, 115.3, 122.5, 124.6, 124.7, 125.4, 126.3, 129.1, 129.4, 5 130.1, 136.7, 138.8, 159.0, 167.5 ppm. IR (ATR): 3429, 3376, 3296, 2985, 1729, 1647, 1625, 1525, 1457, 1361, 1254, 1164, 887, 790 cm"1. LRMS (ESI): m/z = 597, 599 and 601 [(M+Na)+]. HRMS (ESI) calcd for C24H24 403Br2 a: 597.0107, 599.0089 and 601.0073. Found: 597.0114, 599.0091 and 601.0071 [(M+Na)+]. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
52% | With N-(3-dimethylaminopropyl)-N-ethylcarbodiimide; In tetrahydrofuran; at 20℃; for 20h; | In a flask, the [2-amino-2-(6-bromo-lH-indol-3-yl)ethyl]carbamic acid tert-butyl ester (lc) (40 mg, 0.113 mmol) was dissolved in 3 mL of THF. To this solution, 5-bromo-lH-indole-3- carboxylic acid (2b) (27 mg, 0.113 mmol) and l-ethyl-3-(3-dimethylaminopropyl)carbodiimide (EDCI, 22 muEpsilon, 0.124 mmol) were added. The reacting mixture was stirred for 20 hours at room temperature. The homogeneous crude material was then diluted in a large amount of ethyl acetate (30 mL). The organic layer was washed twice with IN aqueous HC1 and once with brine, dried over anhydrous MgS04 and concentrated. The crude material was purified by flash chromatography (EtOAc/pentane, 1/1 then 3/7) to afford the desired product 3h (34 mg, 0.059 mmol) as a white solid. Yield: 52%.Mp: 227 C (EtOAc/pentane). 1H NMR (300 MHz, MeOD): delta = 1.35 (s, 9H), 3.61-3.71 (m, 2H), 5.59-5.65 (m, 1H), 7.12 (dd, J = 1.7 and 8.5 Hz, 1H), 7.24-7.34 (m, 3H), 7.51 (d, J = 1,5 Hz, 1H), 7.64 (d, J = 8.5 Hz, 1H), 7.92 (s, 1H), 8.32 (br s, 1H) ppm. 13C NMR (75.5 MHz, MeOD): delta = 28.7 (C(CH3)3), 45.6 (CH2), 48.2 (CHN), 80.3 (C(CH3)3), 11 1.6, 114.3, 115.3, 115.3, 115.8, 116.1, 121.4, 123.2, 124.1, 124.6, 126.3, 126.6, 129.1, 130.1, 136.7, 139.0, 159.1, 167.5 ppm. IR (ATR): 3364, 3293, 2978, 2933, 1652, 1628, 1530, 1455, 1290, 1253, 1162, 800, 788 cm"1. LRMS (ESI): m/z = 597, 599 and 601 [(M+Na)+]. HRMS (ESI) calcd for C24H24N403Br2Na: 597.0107, 599.0089 and 601.0073. Found: 597.0113, 599.0091 and 601.0071 [(M+Na)+]. |
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