(S)-Azetidine-2-carboxylic acid benzyl ester; compound with trifluoro-acetic acid 、 (S)-2-{[(S)-3-Benzyloxycarbonyl-3-(tetrahydro-pyran-2-yloxy)-propyl]-tert-butoxycarbonyl-amino}-4-oxo-butyric acid benzyl ester 在
sodium cyanoborohydride 作用下,
以
甲醇 为溶剂,
以59%的产率得到(S)-1-((S)-3-Benzyloxycarbonyl-3-{[(S)-3-benzyloxycarbonyl-3-(tetrahydro-pyran-2-yloxy)-propyl]-tert-butoxycarbonyl-amino}-propyl)-azetidine-2-carboxylic acid benzyl ester