Silver-Catalyzed Synthesis of 1-Chloroalkynes Directly from Terminal Alkynes
摘要:
AbstractAn efficient method to prepare 1‐chloroalkynes was investigated. The method involved the use of readily available terminal alkynes and a catalytic amount of a silver salt with N‐chlorosuccinimide as the chlorinating agent under mild conditions. Compared with the existing process, this method has a broad substrate scope: 19 examples were explored, and the products were obtained in excellent yields and were easily isolated by vacuum distillation. Moreover, recycling of the catalyst was achieved by simple filtration and desiccation, which made the method more economic and environmentally benign.
[EN] PROCESS FOR PREPARING SULFONAMIDE COMPOUNDS<br/>[FR] PROCÉDÉ DE PRÉPARATION DE COMPOSÉS DE SULFONAMIDE
申请人:ASCENTAGE PHARMA SUZHOU CO LTD
公开号:WO2020140956A1
公开(公告)日:2020-07-09
Provided are a process for preparing a sulfonamide compound which is an inhibitor of Bcl-2/Bcl-xL, including the compound (3R) -1- (3- (4- (4- (4- (3- (2- (4-chlorophenyl) -1-isopropyl-4-methylsulfonyl-5-methyl-1H-pyrrol-3-yl) -5-fluorophenyl) piperazine -1-yl) -phenylaminosulfonyl) -2-trifluoromethanesulfonyl-anilino) -4-ph enylthio-butyl) -piperidine-4-carboxylic acid 3-phosphonopropyl ester, an intermediate for preparing the sulfonamide compound and a preparation process thereof.
Au-Catalyzed tandem intermolecular hydroalkoxylation/Claisen rearrangement between allylic alcohols and chloroalkynes
作者:Congrong Liu、Jin Xu、Lianghui Ding、Haiyun Zhang、Yunbo Xue、Fulai Yang
DOI:10.1039/c9ob00151d
日期:——
An efficient protocol for the synthesis of γ,δ-unsaturated α-chloroketones has been developed via Au-catalyzed tandem intermolecular hydroalkoxylation/Claisen rearrangement. In the presence of 1 mol% JohnPhosAuCl and 1 mol% NaBArF, a broad range of allylic alcohols smoothly underwent the tandem intermolecular hydroalkoxylation/Claisen rearrangement with aromatic, vinylic or aliphatic chloroalkynes
An iron-catalyzed regio- and stereoselective chlorosulfonylation of aryl chloroalkynes has been described, producing cis-1,2-dichlorovinylsulfones in satisfactory yields with good to excellent stereoselectivity (Z/E up to 95:5). A variety of functional groups such as F, NO2, Cl, Br, OMe, and t-Bu are found to be compatible under the reaction conditions. (C) 2013 Elsevier Ltd. All rights reserved.