Aldehyde 4 reacts in the presence of TMSOTf and an acid scavenger to provide the corresponding oxasilacycle 5 in very good yield and as a single diastereoisomer. The sense of 1,3-stereoinduction serves to introduce a 1,3-svn-diol relationship into the cyclic product. This is in accord with a previous study involving an analogous intramolecular allylation.
醛 4 在 TMSOTf 和酸清除剂存在下反应,以非常好的收率和单一的非对映异构体形式提供相应的草
硅环 5。1,3-立体感应的意义用于将 1,3-svn
-二醇关系引入环状产物。这与先前涉及类似分子内烯丙基化的研究一致。