Dichloromethane as a methylene synthon for regioselective linkage of diverse carboxylic acids: Direct access to methylene diesters under metal-free conditions
作者:Shuiliang Wang、Zhengjiang Fu、Zhicong Huang、Yongqing Jiang、Shengmei Guo、Hu Cai
DOI:10.1016/j.cclet.2019.04.053
日期:2019.6
Abstract A metal-free cross coupling between common CH2Cl2 and carboxylicacids has been achieved with K2CO3 as the sole additive. This simple protocol is a convenient and cost-effective route to synthesize methylene diesters from a wide scope of carboxylicacids substrates with good functional group tolerance. Several gram-scale reactions have been performed to evaluate the effectiveness and practicality
Multicomponent Reaction: Palladium-Catalyzed Carbonylation of Aryl Halides and Alkyl Halides to Aromatic Esters
作者:Fengxiang Zhu、Pengpeng Yin、Pengbo Zhang
DOI:10.1021/acs.joc.2c01794
日期:——
A convenient four-component reaction has been developed that allows for the direct transformation of aryl iodides with alkylhalides into the corresponding aromatic esters and diesters via palladium-catalyzed carbonylation with water as solvent. Various esters and diesters were isolated in moderate to good yields with broad functional group tolerance.
Microwave-assisted, facile, rapid and solvent-free one pot two-component synthesis of some special acylals
作者:Yu-Heng Ma、Gang Wu、Nan Jiang、Shu-Wang Ge、Qian Zhou、Bai-Wang Sun
DOI:10.1016/j.cclet.2014.11.001
日期:2015.1
A facile, rapid and solvent-free method for the conversion of acids and dihalomethane to the corresponding methylene diesters (acylals) using microwave as activators or assistor, is reported. This method is particularly powerful for the diesterification of carboxylic acids, which afford methylene diesters in good to excellent yields (up to >99%). When the intermediate is trapped, a "double successive S(N)2 reactions" mechanism is proved. (C) 2014 Bai-Wang Sun. Published by Elsevier B.V. on behalf of Chinese Chemical Society and Institute of Materia Medica, Chinese Academy of Medical Sciences. All rights reserved.