Oxypalladation Initiating the Oxidative Heck Reaction with Alkenyl Alcohols: Synthesis of Isocoumarin-Alkanones
作者:Meifang Zheng、Liangbin Huang、Qizhen Tong、Wanqing Wu、Huanfeng Jiang
DOI:10.1002/ejoc.201501451
日期:2016.2
Highly regioselective nucleopalladation for the oxidative coupling of internal alkynes with alkenyl alcohols by using green and low-costing oxygen as the sole oxidant was investigated. This one-pot cascade cyclization proceeds through Pd-catalyzed intramolecular C–O bond cyclization, insertion of nonbiased alkenyl alcohols, β-H elimination, and reinsertion of a HPdX species, which is finally transferred
通过使用绿色和低成本的氧气作为唯一氧化剂,研究了用于内部炔烃与链烯醇氧化偶联的高区域选择性核钯化反应。这种一锅级联环化通过 Pd 催化的分子内 C-O 键环化、无偏链烯醇的插入、β-H 消除和 HPdX 物质的重新插入进行,最终转移到目标酮。该方法条件温和,官能团耐受性好,可与未活化的烯烃进行合成,得到异香豆素衍生物。