Regioselective Vinylation of Remote Unactivated C(sp<sup>3</sup>)−H Bonds: Access to Complex Fluoroalkylated Alkenes
作者:Shuo Wu、Xinxin Wu、Dongping Wang、Chen Zhu
DOI:10.1002/anie.201812927
日期:2019.1.28
particular functional group into aliphatic sites by direct activation of unreactive C−H bonds is of great synthetic value. Despite advances in radical‐mediated functionalization of C(sp3)−H bonds by a hydrogen‐atom transfer process, the site‐selective vinylation of remote C(sp3)−H bonds still remains underexplored. Reported herein is a new protocol for the regioselective vinylation of unactivatedC(sp3)−H
ketones, 2-isobutyl-4-methyl-1-arylpentan-1-one derivatives were designed and synthesized for photochemical investigations. Irradiation of such compounds in acetonitrile solution led to the Yang cyclization and Norrish type II cleavage photoproducts with a ratio of 1:1, whereas the reactionconducted in the solid state using the ionic chiral auxiliary method led to only the Yang cyclization product with as