Titanium tetrachloride mediated addition of allyltrimethylsilane to α-diketone diketals (cis-1,6-dialkyl-2,5,7,10-tetraoxabicyclo[4.4.0]decanes) leads to 2,3-diallyl-2,3-dialkyl-1,4-dioxanes with very high diastereoselectivity involving an invertive (SN2-like) substitution.
在
四氯化钛的介导下,烯丙基三甲基
硅烷与 δ-二酮二环(顺式-1,6-二烷基-2,5,7,10-四氧杂双环[4.4.0]
癸烷)加成,以极高的非对映选择性生成 2,3-
二烯丙基-2,3-二烷基-1,4-二氧杂环,其中涉及反相(类似 SN2)取代。