Remote Control of Diastereoselectivity in Intramolecular Reactions of Chiral Allylsilanes
作者:Weston R. Judd、Sooho Ban、Jeffrey Aubé
DOI:10.1021/ja063411+
日期:2006.10.1
During investigations of cyclization reactions between chiral allylsilanes and N-acyliminium ions, it was discovered that a suitably positioned benzyloxy group on the allylsilane component caused a reversal in the diastereoselectivity of these reactions relative to that normally observed with alkyl-substituted allylsilanes. This effect was subsequently observed in two other reaction types. Investigations
在手性烯丙基硅烷和 N-酰基胺离子之间的环化反应的研究过程中,发现烯丙基硅烷组分上适当定位的苄氧基导致这些反应的非对映选择性与通常用烷基取代的烯丙基硅烷观察到的相反。随后在其他两种反应类型中观察到了这种效应。对这种效应的研究导致了通过邻近基团与瞬态阳离子物质相互作用促进的热力学控制形成产物的提议。这一假设得到了所提出的机械途径中中间体的分离的实验支持。