Enantioselective Synthesis of Spiro Chroman‐Isoindolinones via Formal (4+2) Cycloaddition of In Situ‐Generated
<i>ortho</i>
‐Quinone Methides with 3‐Methylene Isoindolinones
作者:Tao Wang、Bo Huang、You‐Qing Wang
DOI:10.1002/adsc.202200350
日期:2022.8.2
Using chiral phosphoric acids as organocatalysts, a formal asymmetric (4+2) cycloaddition of 3-methylene isoindolinone and in situ-generated ortho-quinone methide substrates is disclosed. This reaction exhibited a broad substrate scope with various substituted cyclic enamides and ortho-hydroxybenzyl alcohol derivatives to construct a series of spiro chroman-isoindolinones containing spiro-N,O-heterocycles
使用手性磷酸作为有机催化剂,公开了 3-亚甲基异吲哚啉酮和原位生成的邻-醌甲基化物底物的形式不对称 (4+2) 环加成。该反应显示出广泛的底物范围,各种取代的环状烯酰胺和邻羟基苯甲醇衍生物构建了一系列含有螺-N,O-杂环的螺色满-异吲哚啉酮,其ee为 56% 至 93% 。该策略展示了建立具有两个手性碳中心(包括四取代碳立体中心)的手性螺-N,O-胺系统的巨大潜力。