A copper-catalyzed radical cross-coupling of oxime esters and activatedalkenes is accomplished for the synthesis of cyanoalkylsulfonylated oxindoles and cyanoalkyl amides via an aryl migration strategy. Specifically, the subsequent mechanism research indicates that the unique desulfonylation and sulfone addition processes were involved in the transformation. This transformation is identified as having
Copper-catalyzed arylsulfonylation of N-arylsulfonyl-acrylamides with arylsulfonohydrazides: synthesis of sulfonated oxindoles
作者:Qingshan Tian、Ping He、Chunxiang Kuang
DOI:10.1039/c4ob01231c
日期:——
A copper-catalyzed arylsulfonylation of N-arylsulfonyl-acrylamides with sulfonylhydrazides through a tandem radical process was developed. This methodology provided an alternative strategy for the synthesis of sulfonated oxindoles by forming C–S, C–N and C–C bonds in a single operation.
A radical Smiles rearrangement difunctionalization of activated alkenes via desulfonylation and insertion of sulfur dioxide relay strategy
作者:Si-Wei Tian、Zhen-Tao Luo、Bi-Quan Xiong、Ke-Wen Tang、Peng-Fei Huang、Yu Liu
DOI:10.1039/d4gc00186a
日期:——
alkylsulfonylated oxindoles and amides through a radical Smiles rearrangement strategy was reported. A tandem SO2 insertion/1,4-aryl migration/desulfonylation/cyclization sequence was involved in this transformation. Readily available Hantzsch esters served as alkylation reagents. Two different products were constructed depending on the substituent group of the nitrogen atom.
2.2]octane-1,4-disulfinate), and N-(sulfonyl)acrylamides has been developed. This tandem process went through a cyclopropanol ring opening and Michael addition sequence. The γ-keto sulfinate generated from the reaction between cyclopropanol and DABSO serves as the nucleophilic reagent, and N-(sulfonyl)acrylamide is used as the Michael addition acceptor. By utilizing this strategy, multitudinous sulfone-bridged
2-Aryl propionamides via 1,4-aryl radical migration from N-arylsulfonyl-2-bromopropionamides
作者:Andrew J. Clark、Stuart R. Coles、Alana Collis、David R. Fullaway、Nicholas P. Murphy、Paul Wilson
DOI:10.1016/j.tetlet.2009.08.125
日期:2009.11
Reaction of N-alkyl-N-arylsulfonyl-2-halo-propionamides with pentamethyldiethylenetriamine and either CuBr or CuCl leads to 2-aryl propionamides via initial radical generation, 1,4-aryl migration with loss of SO2 and reduction of the intermediate amidyl radical in 40-99% yields. (C) 2009 Elsevier Ltd. All rights reserved.