Pyrazole → HCID 70147913, compound

Participants

Reaction Conditions

Reaction Steps

Treat a stirred solution of pyrazole (0.22 g, 3.18 mmol, Aldrich Chemical Company) and dimethylformamide (5 mL) at room temperature portionwise with sodium hydride (0.15 g, 3.18 mmol). After 30 minutes, slowly add a solution of 1-(t-butoxycarbonyl)-4-(1-(2-methanesulfonyloxyethyl)-1H-benzimidazol-2-yl)-[1,4]diazepane (0.93 g, 2.12 mmol, Preparation 28) and dimethylformamide, and then heat at 75° C. for 12 hours. Cool, add dichloromethane (100 mL) and wash with water (2×20 mL). Dry (Na2SO4) the organic phase, filter and concentrate. Dry the residue under high vacuum at 100° C. to remove residual dimethylformamide. Purify the residue by radial chromatography (silica gel, ethyl acetate:hexane, 1:1) to afford 4-[1-(2-pyrazol-1-yl-ethyl)-1H-benzoimidazol-2-yl]-[1,4]diazepane-1-carboxylic acid tert-butyl ester (0.71 g), Rf=0.44 (silica gel, ethyl acetate).

Provenance & Evidence