One-pot synthesis of multisubstituted propenylbenzenes from benzyl chlorides through relay catalysis of palladium
作者:Haiyu Wang、Sheng Zhang、Xiujuan Feng、Xiaoqiang Yu、Masahiko Yamaguchi、Ming Bao
DOI:10.1039/d3ob00736g
日期:——
A strategy for the synthesis of multisubstituted propenylbenzenes using benzyl chlorides as starting materials is described. The palladium-catalyzed allylative dearomatization and the subsequent Wagner–Meerwein rearrangement as well as the olefin isomerization proceeded smoothly under mild conditions to produce propenylation products in good yields with high regioselectivity. Control experiments and
Synthesis of dibenzopyranones and pyrazolobenzopyranones through copper(0)/Selectfluor system-catalyzed double CH activation/oxygen insertion of 2-arylbenzaldehydes and 5-arylpyrazole-4-carbaldehydes
作者:Jian Zhang、Dongdong Shi、Haifeng Zhang、Zheng Xu、Hanyang Bao、Hongwei Jin、Yunkui Liu
DOI:10.1016/j.tet.2016.11.069
日期:2017.1
A mild and efficient protocol for the synthesis of dibenzopyranones and pyrazolobenzopyranones was developed involving a copper(0)/Selectfluor system-catalyzed double C-H activation/oxygen insertion of 2-arylbenzaldehydes and 5-arylpyrazole-4-carbaldehydes. Preliminary mechanistic studies suggest that both water and dioxygen act as the oxygen source in the formation of pyranone scaffolds. (C) 2016 Elsevier Ltd. All rights reserved.