The Cyano Group as a Traceless Activation Group for the Intermolecular [3+2] Cycloaddition of Azomethine Ylides: A Five-Step Synthesis of (±)-Isoretronecanol
作者:Jundong Li、Huaibo Zhao、Xunjin Jiang、Xiance Wang、Haiming Hu、Lei Yu、Yandong Zhang
DOI:10.1002/anie.201500961
日期:2015.5.18
The cyano group was used as a traceless activation group for the [3+2] cycloaddition of azomethine ylides in a two‐step process, thereby providing a highly effective approach to 5‐unsubstituted pyrrolidines. The transformation includes the silver acetate catalyzed intermolecular 1,3‐dipolar cycloaddition of α‐iminonitriles and an unprecedented sodium borohydride induced reductive decyanation reaction
在两步过程中,氰基被用作无痕活化基团,用于偶氮甲酰亚胺的[3 + 2]环加成,从而为5未取代的吡咯烷提供了一种高效的方法。转变包括乙酸银催化的α-亚氨基的分子间1,3-偶极环加成反应以及空前的硼氢化钠诱导的还原性脱氰反应。各种各样的基板适合于这种转化。该方法被进一步扩展为吡咯烷定天然产物异维他命醇的五步全合成。