用3当量的t -BuLi处理苄基2-卤代苯基醚会同时导致锂卤交换和在苄基亚甲基上的锂化。这些二价阴离子不进行维蒂希重排,并且可以被亲电试剂捕获。它们与羧酸酯的反应提供相应的2-芳基-3-羟基-2,3-二氢苯并[ b ]呋喃,为非对映异构体的混合物。随后的酸催化或介导的脱水使各种2-芳基-3-取代的苯并[ b ]呋喃具有中等至良好的总收率。
Synthesis of 2,3‐disubstituted Benzofuran via HNTf
<sub>2</sub>
/TMSOTf Catalyzed Intermolecular Reaction of
<i>o‐</i>
alkenyl phenols and Aldehydes
作者:Jingyao Tan、Rui Wang、Li Xu、Wenli Wu、Meijia Deng、Wanhong Yuan、Li Li、Zhihua Lin
DOI:10.1002/adsc.202300123
日期:——
The syntheticmethods of 2,3-disubstituted benzofurans have been widely studied, however, the maneuvers of using o-alkenyl phenols as starting materials are less explored. Herein, we report a general and efficient strategy via HNTf2/TMSOTf catalyzed cascade reaction with readily available o-alkenyl phenols and aldehydes as starting materials, which provides 2,3-disubstituted benzofuran derivatives