Asymmetric Synthesis of All-Carbon Benzylic Quaternary Stereocenters via Conjugate Addition to Alkylidene and Indenylidene Meldrum’s Acids
作者:Ashraf Wilsily、Eric Fillion
DOI:10.1021/jo901559d
日期:2009.11.20
aryl group consistently leading to high enantioselectivities. The nature of the organozinc reagent on the efficiency and selectivity of the conjugate addition was also investigated. The solid-state conformation was determined for a number of alkylidene Meldrum’s acids and correlated with the observed enantioselectivity in relation to the arene pattern of substitution.
进行了系统的研究,概述了对二烷基锌试剂对5-(1-芳基亚烷基)和茚基亚烷基Meldrum酸的对映选择性1,4-加成。彻底探讨了亚烷基上存在的芳基和烷基的变化。1,4-加成显示与广泛的杂芳族和官能团的相容性,并且芳烃的取代模式影响对映体的选择,对位取代的芳基始终导致高对映选择性。还研究了有机锌试剂对偶联物添加效率和选择性的影响。确定了许多亚烷基Meldrum酸的固态构象,并将其与所观察到的与芳烃取代图案有关的对映选择性相关联。