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Chemical Structure| 97817-23-7 Chemical Structure| 97817-23-7

Structure of 97817-23-7

Chemical Structure| 97817-23-7

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Product Details of [ 97817-23-7 ]

CAS No. :97817-23-7
Formula : C6H9N3S
M.W : 155.22
SMILES Code : NC1=NC2=C(CNCC2)S1
MDL No. :MFCD06657759
Boiling Point : No data available
InChI Key :YYZRTZLOUDOIGR-UHFFFAOYSA-N
Pubchem ID :13519687

Safety of [ 97817-23-7 ]

GHS Pictogram:
Signal Word:Warning
Hazard Statements:H302-H315-H319-H335
Precautionary Statements:P261-P305+P351+P338

Computational Chemistry of [ 97817-23-7 ] Show Less

Physicochemical Properties

Num. heavy atoms 10
Num. arom. heavy atoms 5
Fraction Csp3 0.5
Num. rotatable bonds 0
Num. H-bond acceptors 2.0
Num. H-bond donors 2.0
Molar Refractivity 45.86
TPSA ?

Topological Polar Surface Area: Calculated from
Ertl P. et al. 2000 J. Med. Chem.

79.18 Ų

Lipophilicity

Log Po/w (iLOGP)?

iLOGP: in-house physics-based method implemented from
Daina A et al. 2014 J. Chem. Inf. Model.

1.3
Log Po/w (XLOGP3)?

XLOGP3: Atomistic and knowledge-based method calculated by
XLOGP program, version 3.2.2, courtesy of CCBG, Shanghai Institute of Organic Chemistry

0.08
Log Po/w (WLOGP)?

WLOGP: Atomistic method implemented from
Wildman SA and Crippen GM. 1999 J. Chem. Inf. Model.

-0.15
Log Po/w (MLOGP)?

MLOGP: Topological method implemented from
Moriguchi I. et al. 1992 Chem. Pharm. Bull.
Moriguchi I. et al. 1994 Chem. Pharm. Bull.
Lipinski PA. et al. 2001 Adv. Drug. Deliv. Rev.

-0.29
Log Po/w (SILICOS-IT)?

SILICOS-IT: Hybrid fragmental/topological method calculated by
FILTER-IT program, version 1.0.2, courtesy of SILICOS-IT, http://www.silicos-it.com

1.96
Consensus Log Po/w?

Consensus Log Po/w: Average of all five predictions

0.58

Water Solubility

Log S (ESOL):?

ESOL: Topological method implemented from
Delaney JS. 2004 J. Chem. Inf. Model.

-1.22
Solubility 9.29 mg/ml ; 0.0599 mol/l
Class?

Solubility class: Log S scale
Insoluble < -10 < Poorly < -6 < Moderately < -4 < Soluble < -2 Very < 0 < Highly

Very soluble
Log S (Ali)?

Ali: Topological method implemented from
Ali J. et al. 2012 J. Chem. Inf. Model.

-1.3
Solubility 7.83 mg/ml ; 0.0505 mol/l
Class?

Solubility class: Log S scale
Insoluble < -10 < Poorly < -6 < Moderately < -4 < Soluble < -2 Very < 0 < Highly

Very soluble
Log S (SILICOS-IT)?

SILICOS-IT: Fragmental method calculated by
FILTER-IT program, version 1.0.2, courtesy of SILICOS-IT, http://www.silicos-it.com

-1.8
Solubility 2.45 mg/ml ; 0.0158 mol/l
Class?

Solubility class: Log S scale
Insoluble < -10 < Poorly < -6 < Moderately < -4 < Soluble < -2 Very < 0 < Highly

Soluble

Pharmacokinetics

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)
and tested on 415 molecules (test set)
10-fold CV: ACC=0.72 / AUC=0.77
External: ACC=0.88 / AUC=0.94

Yes
CYP1A2 inhibitor?

Cytochrome P450 1A2 inhibitor: SVM model built on 9145 molecules (training set)
and tested on 3000 molecules (test set)
10-fold CV: ACC=0.83 / AUC=0.90
External: ACC=0.84 / AUC=0.91

No
CYP2C19 inhibitor?

Cytochrome P450 2C19 inhibitor: SVM model built on 9272 molecules (training set)
and tested on 3000 molecules (test set)
10-fold CV: ACC=0.80 / AUC=0.86
External: ACC=0.80 / AUC=0.87

No
CYP2C9 inhibitor?

Cytochrome P450 2C9 inhibitor: SVM model built on 5940 molecules (training set)
and tested on 2075 molecules (test set)
10-fold CV: ACC=0.78 / AUC=0.85
External: ACC=0.71 / AUC=0.81

No
CYP2D6 inhibitor?

Cytochrome P450 2D6 inhibitor: SVM model built on 3664 molecules (training set)
and tested on 1068 molecules (test set)
10-fold CV: ACC=0.79 / AUC=0.85
External: ACC=0.81 / AUC=0.87

No
CYP3A4 inhibitor?

Cytochrome P450 3A4 inhibitor: SVM model built on 7518 molecules (training set)
and tested on 2579 molecules (test set)
10-fold CV: ACC=0.77 / AUC=0.85
External: ACC=0.78 / AUC=0.86

No
Log Kp (skin permeation)?

Skin permeation: QSPR model implemented from
Potts RO and Guy RH. 1992 Pharm. Res.

-7.19 cm/s

Druglikeness

Lipinski?

Lipinski (Pfizer) filter: implemented from
Lipinski CA. et al. 2001 Adv. Drug Deliv. Rev.
MW ≤ 500
MLOGP ≤ 4.15
N or O ≤ 10
NH or OH ≤ 5

0.0
Ghose?

Ghose filter: implemented from
Ghose AK. et al. 1999 J. Comb. Chem.
160 ≤ MW ≤ 480
-0.4 ≤ WLOGP ≤ 5.6
40 ≤ MR ≤ 130
20 ≤ atoms ≤ 70

None
Veber?

Veber (GSK) filter: implemented from
Veber DF. et al. 2002 J. Med. Chem.
Rotatable bonds ≤ 10
TPSA ≤ 140

0.0
Egan?

Egan (Pharmacia) filter: implemented from
Egan WJ. et al. 2000 J. Med. Chem.
WLOGP ≤ 5.88
TPSA ≤ 131.6

0.0
Muegge?

Muegge (Bayer) filter: implemented from
Muegge I. et al. 2001 J. Med. Chem.
200 ≤ MW ≤ 600
-2 ≤ XLOGP ≤ 5
TPSA ≤ 150
Num. rings ≤ 7
Num. carbon > 4
Num. heteroatoms > 1
Num. rotatable bonds ≤ 15
H-bond acc. ≤ 10
H-bond don. ≤ 5

1.0
Bioavailability Score?

Abbott Bioavailability Score: Probability of F > 10% in rat
implemented from
Martin YC. 2005 J. Med. Chem.

0.55

Medicinal Chemistry

PAINS?

Pan Assay Interference Structures: implemented from
Baell JB. & Holloway GA. 2010 J. Med. Chem.

0.0 alert
Brenk?

Structural Alert: implemented from
Brenk R. et al. 2008 ChemMedChem

0.0 alert: heavy_metal
Leadlikeness?

Leadlikeness: implemented from
Teague SJ. 1999 Angew. Chem. Int. Ed.
250 ≤ MW ≤ 350
XLOGP ≤ 3.5
Num. rotatable bonds ≤ 7

No; 1 violation:MW<1.0
Synthetic accessibility?

Synthetic accessibility score: from 1 (very easy) to 10 (very difficult)
based on 1024 fragmental contributions (FP2) modulated by size and complexity penaties,
trained on 12'782'590 molecules and tested on 40 external molecules (r2 = 0.94)

2.52

Application In Synthesis of [ 97817-23-7 ]

* 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.

  • Downstream synthetic route of [ 97817-23-7 ]

[ 97817-23-7 ] Synthesis Path-Downstream   1~25

  • 1
  • [ 2253-73-8 ]
  • [ 97817-23-7 ]
  • 2-amino-5-(N-isopropyl-thiocarbamoyl)-4,5,6,7-tetrahydrothiazolo<5,4-c>pyridine [ No CAS ]
  • 2
  • [ 97817-23-7 ]
  • [ 10191-60-3 ]
  • [ 97817-32-8 ]
  • 3
  • [ 97817-23-7 ]
  • [ 1795-48-8 ]
  • 2-amino-5-(N-isopropyl-carbamoyl)-4,5,6,7-tetrahydrothiazolo<5,4-c>pyridine [ No CAS ]
  • 4
  • [ 17356-08-0 ]
  • 3-bromo-piperidin-4-one-hydrobromide [ No CAS ]
  • [ 97817-23-7 ]
  • 6
  • [ 124627-86-7 ]
  • [ 97817-23-7 ]
  • 3-(2-amino-6,7-dihydro-4<i>H</i>-thiazolo[5,4-<i>c</i>]pyridin-5-yl)-2-(2,4-difluoro-phenyl)-1-[1,2,4]triazol-1-yl-butan-2-ol [ No CAS ]
  • 7
  • [ 97817-23-7 ]
  • 2-amino-5-(N-cyano-N'-methylguanyl)-4,5,6,7-tetrahydrothiazolo<5,4-c>pyridine [ No CAS ]
  • 8
  • [ 124458-11-3 ]
  • [ 97817-23-7 ]
YieldReaction ConditionsOperation in experiment
With sodium hydroxide; ammonium chloride; In ethanol; chloroform; 2. 2-Amino-4,5,6,7-tetrahydrothiazolo[5,4-c]pyridine 5-Acetyl-2-amino-4,5,6,7-tetrahydrothiazolo-[5,4-c]pyridine (110 mg, 0.51 mmol) was dissolved in ethanol (1 ml) and treated with sodium hydroxide (15.4 mg, 0.38 mmol) in ethanol (1 ml). The solution was heated to 100 for 16 hours, then treated with additional sodium hydroxide (25.6 mg, 0.64 mmol) and heated to reflux for an additional 16 hours. Solid ammonium chloride was added, and the mixture was filtered and concentrated in vacuo. The residue was dissolved in chloroform, dried over sodium sulfate and solvent was removed, leaving the title product (67.4 mg, 0.43 mmol, 84% yield) as a yellow solid, which was used without further purification.
  • 9
  • [ 124458-10-2 ]
  • [ 97817-23-7 ]
YieldReaction ConditionsOperation in experiment
91% With formaldehyd; acetic acid; In methanol; 6. 2-Amino-4,5,6,7-tetrahydrothiazolo[5,4-c]pyridine A solution of 2-amino-4-(2-aminoethyl)thiazole (1.57 g, 11.0 mmol) in methanol (120 ml) was treated with acetic acid (0.15 ml, 2.6 mmol) and formaldehyde (0.89 ml of a 37% aqueous solution, 11 mmol). After ten minutes, the reaction mixture was concentrated in vacuo and subjected to column chromatography (eluant: 95:4:1 chloroform:methanol:concentrated ammonium hydroxide). The product was obtained as a white solid, m.p. 169-173 (1.547 g, 10.0 mmol, 91% yield). 1 H NMR (DMSO-d6): 6.64 (s, 2H), 3.59 (s, 2H), 2.87 (t, J=6 Hz, 2H), 2.33 (bt, 2H).
  • 10
  • N-cyano-S,S-dimethyl cyanodithioiminocarbonate [ No CAS ]
  • [ 97817-23-7 ]
  • 2-amino-5-(methylthio-N-cyano-iminomethyl)-4,5,6,7-tetrahydrothiazolo[5,4-c]pyridine [ No CAS ]
YieldReaction ConditionsOperation in experiment
85% In ethanol; EXAMPLE 9 2-Amino-5-(N-cyano-N'-methyl-amidino)-4,5,6,7-tetrahydrothiazolo[5,4-c]pyridine (n=0, R1 =R2 =H, R3 =CH3, X=NR8, R8 =CN)-FCE 22952 To a solution of 3.1 g (20 mmol) of <strong>[97817-23-7]2-amino-4,5,6,7-tetrahydrothiazolo[5,4-c]pyridine</strong> in 40 ml of absolute ethanol, 4.09 (28 mmol) of N-cyano-S,S-dimethyl cyanodithioiminocarbonate (IV: X"=NR8, R8 =CN) was added at room temperature. After standing for 30 hours, the reaction mixture was filtered to afford 2-amino-5-(methylthio-N-cyano-iminomethyl)-4,5,6,7-tetrahydrothiazolo[5,4-c]pyridine (V: R1 =R2 =H, n=0, X"=R8, R8 =CN), m.p. 152-155 C., in 85% yield. 4.33 g (17 mmol) of the compound V thus prepared was dissolved in 17 ml of absolute ethanol and treated at room temperature with a 33% solution of methylamine in 55 ml of ethanol.
  • 11
  • [ 24424-99-5 ]
  • [ 97817-23-7 ]
  • [ 365996-05-0 ]
YieldReaction ConditionsOperation in experiment
11.6 g With potassium carbonate; In 1,4-dioxane; water; at 0 - 20℃; for 3h; 6.01.16.03 2-Amino-6,7-dihydro-4H-thiazolo(5,4-c)pyridine-5-carboxylic acid tert-butyl ester 15.8 g <strong>[97817-23-7]4,5,6,7-tetrahydro-thiazolo(5,4-c)pyridin-2-ylamine</strong> and 100 mL dioxane was added to 15.2 g potassium carbonate in 158 mL water. 13.1 g di tert-butyl dicarbonate in 58 mL dioxane was added at 0 C. The reaction mixture was allowed to stir for 3 h at ambient temperature. The reaction mixture was diluted with water and the solid was filtered through silica gel, washed with water (2*50 mL) to afford the desired product. The filtrate was concentrated, diluted with waterand extracted with ethyl acetat. The organic layer was dried over magnesium sulfate and concentrated to afford 11.6 g desired product. 1H NMR (400 MHz, DMSO-d6): delta 1.41 (s, 9H), 2.43 (t, 2H), 3.56 (t, 2H), 4.28 (s, 2H), 6.80 (s, 2H)
11.6 g With potassium carbonate; In 1,4-dioxane; water; at 0 - 20℃; for 3h; 6.01.08.03 2-Amino-6,7-dihydro-4H-thiazolo[5,4-c]pyridine-5-carboxylic acid tert-butyl ester 15.8 g <strong>[97817-23-7]4,5,6,7-tetrahydro-thiazolo[5,4-c]pyridin-2-yl-amine</strong> and 100 mL dioxane was added to 15.2 g potassium carbonate in 158 mL water. 13.1 g di tert-butyl dicarbonate in 58 mL dioxane was added at 0 C. The reaction mixture was allowed to stir for 3 h at ambient temperature. The reaction mixture was diluted with water and the solid was filtered through silica gel, washed with water (2*50 mL) to afford the desired product. The filtrate was concentrated, diluted with water and extracted with ethyl acetat. The organic layer was dried over magnesium sulfate and concentrated to afford 11.6 g of the desired product. 1H NMR (400 MHz, DMSO-d6): delta 1.41 (s, 9H), 2.43 (t, 2H), 3.56 (t, 2H), 4.28 (s, 2H), 6.80 (s, 2H); (M+H)+: 256
  • 12
  • [ 97817-23-7 ]
  • [ 1440954-95-9 ]
  • 13
  • [ 97817-23-7 ]
  • [ 1209487-67-1 ]
  • 14
  • [ 97817-23-7 ]
  • [ 1209528-85-7 ]
  • 15
  • [ 97817-23-7 ]
  • [ 1440954-96-0 ]
  • 16
  • [ 97817-23-7 ]
  • [ 1440954-97-1 ]
  • 17
  • [ 1373615-78-1 ]
  • [ 97817-23-7 ]
  • [ 1542266-10-3 ]
YieldReaction ConditionsOperation in experiment
37.8% With cesium fluoride; In dimethyl sulfoxide; at 120℃; for 36h; [0128] Method F-Step c: 5-(5'-chloro-3,5-dimethyl-[2,4'-bipyridin]-2'-yl)-4,5,6,7- tetrahydrothiazolo[5,4-c]pyridin-2-amine [0129] 2',5'-Dichloro-3,5-dimethyl-2,4'-bipyridine (180 mg, 0.7 mmol) was dissolved in DMSO (lmL) followed by addition of CsF (152mg, lmmol) and 4,5,6,7- tetrahydrothiazolo[5,4-c]pyridin-2-amine (55mg, 0.35mmol). The mixture was stirred at 120 C for 36 hours. Then the mixture was portioned between ethyl acetate (10 mL) and water (5 mL), washed with brine (5 mL). The organic layer was dried over Na2S04 and concentrated under reduced pressure, purified by silica gel column chromatography ( MeOH:CH2Cl2 = 1:100) to give a yellow oil (50mg, 37.8%). FontWeight="Bold" FontSize="10" H NMR (400 MHz, CDC13) delta 8.35 (s, 1H), 8.21 (s, 1H), 7.44 (s, 1H), 6.65 (s, 1H), 4.56 (s, 2H), 3.86 (s, 2H), 2.75 (s, 2H), 2.38 (s, 3H), 2.17 (s, 3H); ESI-MS(m z): 371.8[M+1]+.
  • 18
  • [ 1373615-78-1 ]
  • [ 97817-23-7 ]
  • [ 1542266-11-4 ]
  • 20
  • [ 365996-05-0 ]
  • [ 97817-23-7 ]
YieldReaction ConditionsOperation in experiment
87% With hydrogenchloride; In ethyl acetate; at 20℃; for 3h; [0126] Method F-Step b: 4,5,6,7-tetrahydrothiazolo[5,4-c]pyridin-2-amine [0127] Tert-butyl 2-amino-6,7-dihydrothiazolo[5,4-c]pyridine-5(4H)-carboxylate(200 mg, 0.78 mmol) was dissolved in 3M HCl/ethyl acetate (3 mL). The mixture was stirred at room temperature for 3 hours, then the solvent was removed by vacuum, and the residue was portioned between CH2CI2 (20 mL) and saturated aqueous sodium bicarbonate (5 mL), the organic layer was separated, dried over Na2S04 and concentrated to give a white solid (105mg, 87%).
With trifluoroacetic acid; In dichloromethane; at 20℃; for 1h; The confirmed TR-03a was then treated with 1 : 1 ratio ofdichloromethane and trifluoroacetic acid and stirred for 1 hat room temperature. The reaction mixture was concentratedand washed with water and diethyl ether. Then the reactionmixture was dissolved in dichloromethane, washed with water and brine, and concentrated by drying over anhydrous Na2SO4 to obtain TR-03. The purity of the compound wasconfirmed by NMR spectra; 1H NMR (300MHz, DMSO-d6) delta= 2.32 (t, 2H, J = 5.4Hz), 2.86 (t, 2H, J = 5.4Hz), 3.59 (s,2H), 6.63 (s, 2H, NH2).
With hydrogenchloride; In 1,4-dioxane; water; at 20℃; for 3h; To a solution of compound 20q (1.42 g, 5.6 mmol) indioxane (5 mL) was added 10 mL 4 N hydrochloric acid in dioxane.The resulting mixture was stirred at room temperature for 3 h. Thereaction mixture was filtered and solid was washed with ethylacetate, then dried under vacuum to obtain the hydrochloride 20r,which was used in the next step without further purification.
With trifluoroacetic acid; In dichloromethane; at 5℃; for 2h; Step (2), shown in the structural formula (CAS: 365996-05-0)2-Amino-6,7-dihydrothiazolo[5,4-c]pyridine-5(4H)-carboxylic acid tert-butyl ester (80.00 g, 303.91 mmol)As raw material, it was mixed with 300 mL of trifluoroacetic acid in 300 mL of dichloromethane, reacted at 5 C for 2 h, concentrated, without purification.Directly obtained as shown in the structural formula (CAS: 97817-23-7)4,5,6,7-tetrahydrothiazole [5,4-C]pyridin-2-amine (303.91 mmol, yield 100%);

  • 21
  • [ 97817-23-7 ]
  • [ 79-44-7 ]
  • 2-amino-N,N-dimethyl-6,7-dihydrothiazolo[5,4-c]pyridine-5(4H)-carboxamide [ No CAS ]
YieldReaction ConditionsOperation in experiment
To a solution of 20r inacetonitrile (25 mL) was added potassium carbonate (1.53 g,11.1 mmol), followed by the addition of dimethylformamide (2.90 g,11.1 mmol). The mixture was stirred at 0 C for 1 h under atmosphere.Then N,N-dimethylcarbamoyl chloride (0.60 g, 5.56 mmol)was added dropwise at 0 C. The reaction mixture was stirredovernight at room temperature.Water was added, and the reactionmixture was partitioned between ethyl acetate and water. Theorganic layer was washed with water and brine successively, driedover anhydrous sodium sulfate, and concentrated in vacuum toobtain the desired product as a beige solid (0.40 g), mp 210e211 C.Overall yield of the two steps: 32%. 1H NMR (300 MHz, DMSO-d6)d 6.77 (s, 2H), 4.11 (s, 2H), 3.50e3.44 (m, 2H) 2.75 (s, 6H), 2.69e2.54(m, 2H). MS (ESI) m/z: 227.1 [MH].
  • 22
  • [ 97817-23-7 ]
  • (S)-2-(3-(4-(azetidine-1-carbonyl)phenoxy)-5-((1-methoxypropan-2-yl)oxy)benzamido)-N,N-dimethyl-6,7-dihydrothiazolo[5,4-c]pyridine-5(4H)-carboxamide [ No CAS ]
  • 23
  • [ 144-48-9 ]
  • [ 97817-23-7 ]
  • 2-(2-amino-6,7-dihydro[1,3]thiazolo[5,4-c]pyridin-5(4H)-yl)acetamide [ No CAS ]
YieldReaction ConditionsOperation in experiment
54% With N-ethyl-N,N-diisopropylamine; In tetrahydrofuran; at 20℃; To a mixture of <strong>[97817-23-7]4,5,6,7-tetrahydro[1,3]thiazolo[5,4-c]pyridin-2-amine</strong> (50 mg, 0.322 mmol) and DIPEA (0.072 mL, 0.418 mmol) in THE (3 mL), 2-iodoacetamide (65 mg, 0.354 mmol) was added and the reaction let under stirring at rt overnight. After solvent removal under reduced pressure, the title compound was isolated by column chromatography (eluant DCM:MeOH = 90:10) as white solid (37 mg, 54%).NMR (500 MHz, DMSO-d6) ppm 2.73 (t, J=5.72 Hz, 2 H) 3.03 (s, 2 H) 3.46 (s, 2 H) 6.70 (br. s., 2 H) 7.12 (br. s.,H) 7.23 (br. s., 1 H).HRMS (ESI+): calcd. for 08H13N40S [M + H] 213.0805; found 213.0799.
  • 24
  • [ 97817-23-7 ]
  • [ 501-53-1 ]
  • 2-amino-5-CBZ-4,5,6,7-tetrahydrothiazolo[5,4-c]pyridine [ No CAS ]
YieldReaction ConditionsOperation in experiment
With triethylamine; In dichloromethane; at 5℃; for 1h; Step (3), using 4,5,6,7-tetrahydrothiazole [5,4-C]pyridin-2-amine (303.91 mmol) represented by the structural formula (CAS: 97817-23-7) as a raw material,Mix well with triethylamine (92.25 g, 911.69 mmol) in dichloromethane (DCM).Benzyl chloroformate (57.03 g, 334.29 mmol) of the formula (CAS: 501-53-1) was added dropwise at 5 C to obtain a reaction mixture, and then the reaction mixture was stirred for 1 h.The reaction mixture was quenched with additional 500 mL of water and then extracted three times with 200 mL dichloromethane (DCM).The organic phase obtained by the extraction is washed once with water and brine, dried over anhydrous sodium sulfate, filtered and concentrated to give a crude product.The crude product was beaten with 100 mL of ethyl acetate to give the final product as a yellow solid.2-Amino-5-CBZ-4,5,6,7-tetrahydrothiazolo[5,4-C]pyridine, the structure identification data is as follows:
  • 25
  • 2-(4-((4-fluoro-3-methylphenyl)carbamoyl)-1,3,5-trimethyl-1H-pyrrol-2-yl)-2-oxoacetic acid [ No CAS ]
  • [ 97817-23-7 ]
  • 5-(2-(2-amino-6,7-dihydrothiazolo[5,4-c]pyridin-5(4H)-yl)-2-oxoacetyl)-N-(4-fluoro-3-methylphenyl)-1,2,4-trimethyl-1H-pyrrole-3-carboxamide [ No CAS ]
YieldReaction ConditionsOperation in experiment
General procedure: HATU (90 mg, 0.24 mmol) was added to a solution of 1g (60 mg, 0.19) in DMA (0.75 mL) at 0 C. After 20 min, tert-butylamine (20 mg, 0.28) and DIPEA (50 mg, 0.38 mmol) in DMA (0.4 mL) were added. The reaction mixture was stirred at rt for 20 hrs. The reaction mixture was quenched with aqueous TFA (4%, 0.4 mL), then, extracted with EtOAc (10 mL). The organic layer was washed with water and brine, concentrated in vacuo, then, purified by reverse phase chromatography eluted with ACN and water, and dried using lyophilization to afford the title product as white solid. ESI-MS, m/z 360 (MH)+.
 

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