二碳酸二叔丁酯 、
methyl (S)-3-amino-4-((3aR,5R,6S,6aR)-6-methoxy-2,2-dimethyltetrahydrofuro[2,3-d][1,3]dioxol-5-yl)butanoate 在
三乙胺 作用下,
以
四氢呋喃 为溶剂,
以93%的产率得到methyl (3S)-4-[(3aR,5R,6S,6aR)-6-methoxy-2,2-dimethyl-3a,5,6,6a-tetrahydrofuro[2,3-d][1,3]dioxol-5-yl]-3-[(2-methylpropan-2-yl)oxycarbonylamino]butanoate