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
Enantioselective Synthesis of α-All-Carbon Quaternary Center-Containing Carbazolones via Amino-palladation/Desymmetrizing Nitrile Addition Cascade
作者:Xu-Dong Hu、Zi-Hao Chen、Jing Zhao、Rui-Ze Sun、Hui Zhang、Xiaotian Qi、Wen-Bo Liu
DOI:10.1021/jacs.1c00840
日期:2021.3.17
An enantioselective Pd(II)-catalyzed amino-cyclization and desymmetrizing nitrile addition cascade reaction of alkyne-tethered malononitriles is reported. This reaction forms two rings and one quaternary carbon center in a single step and serves as an efficient strategy for the construction of α-quaternary carbazolones with high enantioselectivities (up to 98:2 er). The utility of this method is demonstrated
报道了炔烃系丙二腈的对映选择性 Pd(II) 催化的氨基环化和去对称腈加成级联反应。该反应一步形成两个环和一个季碳中心,是构建具有高对映选择性(高达 98:2 er)的 α-季卡唑啉酮的有效策略。该方法的效用通过产品衍生化为各种杂环和含腈的 leucomidine A 类似物来证明。