(3aR,4S,6S,7R,7aR)-4-((R)-1,2-diacetoxyethyl)tetrahydro-3aH-spiro[[1 ,3]dioxolo[4,5-c]pyran-2,1'-cyclohexane]-6,7-diyl diacetate 、
3-(三甲基硅基)-4-戊烯酸甲酯 在
3-(三甲基硅基)-4-戊烯酸甲酯 作用下,
以88的产率得到methyl (E)-5-[(3aR,4S,6S,7S,7aR)-7-acetyloxy-4-[(1R)-1,2-diacetyloxyethyl]spiro[4,6,7,7a-tetrahydro-3aH-[1,3]dioxolo[4,5-c]pyran-2,1'-cyclohexane]-6-yl]pent-3-enoate