Iridium-Catalyzed Intramolecular β-C–H Alkenylation of Ketones with Alkynes via a Hydride-Transfer Approach
作者:Bo Zhou、Shuang Deng、Yin Xu、Xiaotian Qi、Guangbin Dong
DOI:10.1021/jacs.2c11505
日期:2022.12.21
functionalization of carbonyl β C–H bonds without using directing groups has not been a trivial task, and it is even more challenging to realize the corresponding atom-economical transformations with common alkenes or alkynes as the coupling partner. Here, we describe the development of an iridium-catalyzed intramolecular direct β-alkenylation of ketones with regular alkynes. The reaction is redox neutral
在不使用导向基团的情况下直接功能化羰基 β C-H 键并不是一项微不足道的任务,而以常见的烯烃或炔烃作为偶联伙伴实现相应的原子经济转化更具挑战性。在这里,我们描述了铱催化的酮与常规炔烃的分子内直接 β-烯基化的发展。该反应是氧化还原中性的,避免强酸或强碱,并容忍各种官能团。结合实验和计算机制研究揭示了氢化物转移途径,涉及酮 α,β-去饱和、铱-氢化物介导的炔烃插入、共轭加成和 α-质子化。