Organocatalytic Aza-Michael/Michael Cyclization Cascade Reaction: Enantioselective Synthesis of Spiro-oxindole Piperidin-2-one Derivatives
作者:Qing-Gang Tang、Sen-Lin Cai、Chuan-Chuan Wang、Guo-Qiang Lin、Xing-Wen Sun
DOI:10.1021/acs.orglett.0c00779
日期:2020.5.1
A simple, direct, and highly enantioselective synthesis of spiro-oxindole piperidin-2-one derivatives was achieved through an aza-Michael/Michael cyclization cascade sequence using a squaramide catalyst. The desired products were obtained in excellent yields (up to 99%) and good to high stereoselectivities (up to >20:1 dr and up to 99% ee) under mild conditions.
使用方酰胺催化剂通过氮杂迈克尔/迈克尔环化级联序列实现了螺-羟吲哚哌啶-2-酮衍生物的简单、直接和高度对映选择性合成。在温和条件下以优异的收率(高达 99%)和良好的立体选择性(高达 >20:1 dr 和高达 99% ee)获得所需的产物。