反应详情

2-Methyl-1H-imidazole-4-carboxylic acid (1.364 g, 10.82 mmol) was suspended in N,N-Dimethyl formamide (25 ml). 0-(benzotriazol-1-yl)-N,N,N′,N′-tetramethyluroniumhexafluorophosphate (0.342 g, 0.901 mmol), 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride (2.073 g, 10.82 mmol), DIPEA (3.14 ml, 18.03 mmol) and (S)-4-(1-(2-aminopropyl)-1H-pyrazol-3-yl)-2-chlorobenzonitrile (2.5 g, 9.01 mmol) were rapidly added into the mixture, respectively. The reaction mixture was stirred at RT overnight. Next day water was slowly added and the mixture was extracted twice with DCM. The combined organic phases were extracted three times with water and the DCM-layer was evaporated. The product was crystallized from acetonitrile/water mixture and finally dried with vacuum at 40° C. Yield 71.6%. 1H-NMR (400 MHz; d6-DMSO): δ 1.08 (d, 3H), 2.31 (s, 3H), 4.27 (dd, 1H), 4.32-4.48 (m, 2H), 6.95 (d, 1H), 7.41 (s, 1H), 7.82 (d, 1H), 7.95-8.02 (m, 2H), 8.04 (d, 1H), 8.10 (m, 1H), 12.10 (bs, 1H).

1. extractionthe mixture was extracted twice with DCM
2. extractionThe combined organic phases were extracted three times with water
3. customthe DCM-layer was evaporated
4. customThe product was crystallized from acetonitrile/water mixture
5. customfinally dried with vacuum at 40° C