A Ru-Catalyzed Tandem Alkyne−Enone Coupling/Michael Addition: Synthesis of 4-Methylene-2,6-<i>cis</i>-tetrahydropyrans
作者:Barry M. Trost、Hanbiao Yang、Georg Wuitschik
DOI:10.1021/ol0520065
日期:2005.10.1
[reaction: see text] A Ru-catalyzed tandem alkyne-enone coupling/Michael addition reaction is reported. It provides an efficient, atom-economic entry to 4-methylene-2,6-cis-tetrahydropyrans from simple, readily available homopropargylic alcohols and beta,gamma-unsaturated enones in good yields. Further functionalization of the resultant vinylsilane leads to the synthesis of either geometrically defined
[反应:见正文]报告了Ru催化的串联炔烃-烯酮偶联/ Michael加成反应。它可以简单易得的均丙醇和β,γ-不饱和烯酮以高收率高效,原子经济地进入4-亚甲基-2,6-顺式四氢吡喃。所得乙烯基硅烷的进一步官能化导致在几何上限定于2,6-顺式-二氢吡喃外环的三取代烯烃的合成。