Methanesulfonic acid (E)-3-[(4S,5R)-5-((4R,5S)-5-benzyloxymethyl-5-tert-butoxycarbonylamino-2,2-dimethyl-[1,3]dioxan-4-yl)-2,2-dimethyl-[1,3]dioxolan-4-yl]-allyl ester 在
lithium bromide 作用下,
以
四氢呋喃 为溶剂,
反应 0.67h,
以72.2 mg的产率得到tert-butyl N-[(E,2S,3R,4R,5S)-2-benzyloxymethyl-8-bromo-1,3:4,5-bis(isopropylidenedioxy)oct-6-en-2-yl]carbamate