[NH:1]1[CH:5]=[CH:4][N:3]=[CH:2]1.[H-].[Na+].[C:8]([O:12][C:13]([N:15]1[CH2:21][CH2:20][CH2:19][N:18]([C:22]2[N:26]([CH2:27][CH2:28]OS(C)(=O)=O)[C:25]3[CH:34]=[CH:35][CH:36]=[CH:37][C:24]=3[N:23]=2)[CH2:17][CH2:16]1)=[O:14])([CH3:11])([CH3:10])[CH3:9].CO.ClCCl>CN(C)C=O>[C:8]([O:12][C:13]([N:15]1[CH2:21][CH2:20][CH2:19][N:18]([C:22]2[N:26]([CH2:27][CH2:28][N:1]3[CH:5]=[CH:4][N:3]=[CH:2]3)[C:25]3[CH:34]=[CH:35][CH:36]=[CH:37][C:24]=3[N:23]=2)[CH2:17][CH2:16]1)=[O:14])([CH3:10])([CH3:11])[CH3:9]Combine imidazole (0.08 g, 1.2 mmol) and dimethylformamide (2 mL). Cool in an ice bath and add sodium hydride (0.04 g, 60% i oil, 1.2 mmol). After 30 minutes, warm to ambient temperature. Add a solution of 1-(t-butoxycarbonyl)-4-(1-(2-methanesulfonyloxyethyl)-1H-benzimidazol-2-yl)[1,4]diazepane (0.35 g, 0.80 mmol) in dimethylformamide (2 mL). Heat to 75° C. After 12 hours, partition the reaction mixture between water and dichloromethane. Extract the organic layer twice with water, dry over Na2SO4, filter, and concentrate in vacuo to give a residue. Chromatograph the residue on silica gel eluting with 5% methanol/dichloromethane/0.5% concentrated aqueous ammonia to give 1-(t-butoxycarbonyl)-4-(1-(2-(1H-imidazol-1-yl)ethyl)-1H-benzimidazol-2-yl)[1,4]diazepane: Rf=0.44 (silica gel, 5% methanol/dichloromethane/0.5% concentrated aqueous ammonia).
Wird geladen…