Enantioselective Synthesis of Fused Isocoumarins via Palladium-Catalyzed Annulation of Alkyne-Tethered Malononitriles
作者:Hui Zhang、Weishuang Li、Xu-Dong Hu、Wen-Bo Liu
DOI:10.1021/acs.joc.1c01026
日期:2021.8.6
An enantioselective palladium-catalyzed annulation of alkyne-tethered malononitriles for the synthesis of 3,4-ring-fused isocoumarins is described. This cascade strategy involves oxypalladation of ortho-alkynylbenzoates and desymmetrizing addition onto one cyano group of the pendant malononitriles, which enables the concurrent construction of two rings and an all-carbon quaternary stereocenter in a
描述了一种对映选择性钯催化的炔烃系丙二腈环化,用于合成 3,4-环稠合异香豆素。这种级联策略涉及邻-炔基苯甲酸酯的羟基钯化和去对称加成到悬垂的丙二腈的一个氰基上,这使得能够在一次操作中同时构建两个环和一个全碳四元立体中心。