Synthesis of Chromeno[2,3-d]imidazol-9(1H)-ones via Tandem Reactions of 3-Iodochromones with Amidines Involving Copper-Catalyzed C–H Functionalization and C–O Bond Formation
摘要:
A novel six-membered heterocyclic skeleton of imidazochromone was prepared via an efficient one-pot reaction including a key step of copper-catalyzed aerobic C-H intramolecular cycloetherification. Notably, this process does not require the presence of strong para electron-withdrawing groups on the phenol component. Also, the results of this effort show that acyl phenols containing electron-rich heterocycles participate in an efficient C-H activation/C-O formation process.
Ruthenium‐Catalysed Asymmetric Intramolecular Isomerization/Esterification Reaction: Direct Synthesis of Chiral Dihydrocoumarins
作者:Lingzi Zhao、Xuchao Wang、Qing Qiang、Xingwei Zhao、Feipeng Liu、Shenci Lu、Zi‐Qiang Rong
DOI:10.1002/cjoc.202400084
日期:2024.8.15
An asymmetric isomerization/intramolecular coupling reaction of allylic alcohols to synthesize chiral dihydrocoumarins was successfully accomplished through ruthenium catalysis. This method demonstrates a wide substrate applicability, excellent tolerance for various functional groups, and good enantioselectivities (up to 90% ee). It provides a convenient pathway to produce a diverse range of structurally
Rh(III)-catalyzed aldehyde C–H bond functionalization of salicylaldehydes with arylboronic acids
作者:Dahai Wang、Sunliang Cui
DOI:10.1016/j.tet.2015.09.053
日期:2015.11
A Rh(III)-catalyzed aldehyde C-H bond functionalization of salicylaldehydes with arylboronic acids has been developed, with features of mild reaction condition and high efficiency. Furthermore, the functionalized 2-hydroxybenzophenone could be subject to divergent synthesis of heterocycles. (C) 2015 Elsevier Ltd. All rights reserved.
MURO TOMIO; YUKI HIROSHI; KAWAKITA TAKESHI; CHIHARA YASUAKI; YASUMOTO MIT+, J. PHARM. SOC. JAP., 106,(1986) N 9, 764-774