反应详情

Add to a suspension of sodium hydrdide (0.029 g, 1.21 mmol) in anhydrous dimethylformamide (5 mL) a suspension of 1-(t-butoxycarbonyl)-4-(1H-benzimidazol-2-yl)[1,4]diazepan (0.38 g, 1.2 mmol, Preparation 9) in anhydrous dimethylformamide (7 mL). Stir for 3 hours at room temperature and add a large excess of 1,1,1-trifluoro-methanesulfonic acid 2,2,2-trifluoro-ethyl ester. Stir overnight at room temperature, quench the reaction with water, wash the organic phase with water, dry (MgSO4), filter and concentrate in vacuo to afford 4-[1-(2,2,2-trifluoro-ethyl)-1H-benzoimidazol-2-yl]-[1,4]diazepane-1-carboxylic acid tert-butyl ester. Repeat this preparation using 2.88 mmol of 1-(t-butoxycarbonyl)-4-(1H-benzimidazol-2-yl)[1,4]diazepan. Combine the product from both reactions and purify by column chromatography on silica gel eluting with 30% ethyl acetate in hexane and concentrate the appropriate fractions to afford 0.48 g of 4-[1-(2,2,2-trifluoro-ethyl)-1H-benzoimidazol-2-yl]-[1,4]diazepane-1-carboxylic acid tert-butyl ester.

1. stirringStir overnight at room temperature
2. customquench
3. customthe reaction with water
4. washwash the organic phase with water
5. dry with materialdry (MgSO4)
6. filtrationfilter
7. concentrationconcentrate in vacuo