Synthesis of Functionalized Benzo[<i>b</i>]furans via Oxidative Cyclization of <i>o</i>-Cinnamyl Phenols
作者:Mohammad Rehan、Rajender Nallagonda、Braja Gopal Das、Tannu Meena、Prasanta Ghorai
DOI:10.1021/acs.joc.6b02752
日期:2017.4.7
Disclosed herein is an efficient synthetic route for the synthesis of functionalized 2-benzyl benzo[b]furans via a regioselective 5-exo-trig intramolecular oxidative cyclization of ortho-cinnamyl phenols using [PdCl2(CH3CN)2] as catalyst and benzoquinone as an oxidant. Further, a sequential ortho-cinnamylation of phenols using cinnamyl alcohols catalyzed by Re2O7, followed by an oxidative cyclization
本文所公开的是用于官能化的2-苄基苯并[合成的有效合成路线b ]呋喃经由区域选择性5 -外-TRIG分子内的氧化环化邻-使用肉桂酚[的PdCl 2(CH 3 CN)2 ]作为催化剂和苯醌作为氧化剂。此外,使用由Re 2 O 7催化的肉桂醇对苯酚进行邻位邻肉桂酸化,然后使用上述Pd催化剂进行氧化环化。反应显示出广泛的底物范围,具有良好至优异的产率。