四溴化碳 、
(2R)-2-((4R,5S,6S)-6-((1R)-1-((1S,3R,4R,5S)-1,4-dimethyl-2,8-dioxabicyclo[3.2.1]octan-3-yl)ethyl)-2,2,5-trimethyl-1,3-dioxan-4-yl)propanal 在
三乙胺 、
三苯基膦 作用下,
以
二氯甲烷 为溶剂,
以81%的产率得到(1S,3R,4R,5S)-3-((R)-1-((4R,5R,6S)-6-((S)-4,4-dibromobut-3-en-2-yl)-2,2,5-trimethyl-1,3-dioxan-4-yl)ethyl)-1,4-dimethyl-2,8-dioxabicyclo[3.2.1]octane