Triflic Acid-Catalyzed Additions of 2-Alkoxycarbonyl Allylboronates to Aldehydes. Study of Scope and Mechanistic Investigation of the Reaction Stereochemistry
作者:Tim G. Elford、Yuichiro Arimura、Siu Hong Yu、Dennis G. Hall
DOI:10.1021/jo062151b
日期:2007.2.1
The substrate scope and the effect of substrate on the observed inversion of stereoselectivity in the triflic acid-catalyzed allylboration reaction between 2-alkoxycarbonyl allylboronates and aldehydes are presented. A mechanistic investigation is described so as to confirm the involvement of a carbocation intermediate as the source of stereochemical inversion. This methodology allows a facile access
介绍了底物的范围和底物对在三氟乙酸催化的2-硼氧基羰基烯丙基硼酸酯和醛之间的三氟甲磺酸催化的烯丙基硼化反应中观察到的立体选择性转化的影响。描述了一种机理研究,以确认碳正离子中间体作为立体化学转化的来源。该方法允许容易地获得在α位具有外亚甲基的β,γ-二取代的五元环内酯。