Organocatalyzed Asymmetric Vinylogous Allylic–Allylic Alkylation of Morita–Baylis–Hillman Carbonates with Olefinic Azlactones: Facile Access to Chiral Multifunctional α-Amino Acid Derivatives
作者:Shuai Zhao、Yuan-Yuan Zhao、Jun-Bing Lin、Ting Xie、Yong-Min Liang、Peng-Fei Xu
DOI:10.1021/acs.orglett.5b01066
日期:2015.7.2
Vinylogous reactivity of olefinic azlactones was realized through the development of a chiral amine-catalyzed highly stereoselective allylic–allylic alkylation with Morita–Baylis–Hillman carbonates. The Lewis base activation of electrophile and Brønsted base activation of nucleophile were efficiently combined, giving access to multifunctional acyclic α-amino acid derivatives in a highly stereocontrolled
烯烃a内酯的乙烯基反应性是通过与Morita-Baylis-Hillman碳酸盐的手性胺催化的高度立体选择性烯丙基-烯丙基烷基化反应的发展而实现的。亲电试剂的Lewis碱活化和亲核试剂的Brønsted碱活化被有效地结合在一起,从而以高度立体可控的方式获得了多功能无环α-氨基酸衍生物。这些通用合成子的合成效用通过保护性环状季α-氨基酸的简便合成得到了进一步证明。