Benzyl chloroformate → 1-Benzyloxycarbonyl-3-(S)-tert-butyldimethylsilyloxy-4-(R)-(1-ethoxycarbonylcyclopropyl)pyrrolidine
반응식
[Si:1]([O:8][C@H:9]1[C@H:13]([C:14]2([C:17]([O:19][CH2:20][CH3:21])=[O:18])[CH2:16][CH2:15]2)[CH2:12][N:11]([C@H](C2C=CC=CC=2)C)[CH2:10]1)([C:4]([CH3:7])([CH3:6])[CH3:5])([CH3:3])[CH3:2].Cl[C:31]([O:33][CH2:34][C:35]1[CH:40]=[CH:39][CH:38]=[CH:37][CH:36]=1)=[O:32]>ClCCl>[CH2:34]([O:33][C:31]([N:11]1[CH2:12][C@@H:13]([C:14]2([C:17]([O:19][CH2:20][CH3:21])=[O:18])[CH2:16][CH2:15]2)[C@H:9]([O:8][Si:1]([C:4]([CH3:5])([CH3:7])[CH3:6])([CH3:3])[CH3:2])[CH2:10]1)=[O:32])[C:35]1[CH:40]=[CH:39][CH:38]=[CH:37][CH:36]=1참가 물질
4
반응물 2
생성물 1
시약·촉매·용매 1
실험 절차
3-(S)-Tert-butyldimethylsilyloxy-4-(R)-(1-ethoxycarbonylcyclopropyl)-1-[1-(S)-phenylethyl]pyrrolidine (5.48 g, 13.15 mmol) was dissolved in dry dichloromethane (120 ml), and benzyl chloroformate (3.76 ml, 26.3 mmol) was added dropwise to the thus prepared solution which was cooled in an ice bath. After heating the reaction solution under reflux for 2 hours, dichloromethane was evaporated under reduced pressure. Thereafter, the resulting residue was subjected to flash silica gel chromatography and eluted with an eluant of n-hexane:ethyl acetate=5:1, to thereby obtain 4.52 g (77%) of the title compound as a colorless oil.