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
Metal-Free Oxidative 1,2-Arylmethylation Cascades of <i>N</i>-(Arylsulfonyl)acrylamides Using Peroxides as the Methyl Resource
作者:Fang-Lin Tan、Ren-Jie Song、Ming Hu、Jin-Heng Li
DOI:10.1021/acs.orglett.6b01419
日期:2016.7.1
1,2-arylmethylation cascades of N-(arylsulfonyl)acrylamides for the assembly of 2,2-disubstituted-N-arylbutanamides containing an all-carbonquaternarycenter is presented. This reaction enables the one-step formation of two new C–C bonds through a sequence of methylation/1,4-aryl migration/desulfonylation using an organic peroxide as the methyl resource with a broad substrate scope and excellent functional
Molecular Oxygen Mediated Radical Dicarbofunctionalization of Olefin with Aldehyde
作者:Promita Biswas、Joyram Guin
DOI:10.1021/acs.joc.8b00618
日期:2018.5.18
quaternary stereogenic center at the α-position via a one-pot alkylation/aryl-migration/desulfonylation radical cascade. The novel process is developed employing readily available and inexpensive aldehyde as an alkyl radical precursor and O2 as the sole oxidant. The method features a broad substrate scope, operational simplicity, convenient reagents, and scalability. A radical chain mechanism that
decarboxylative addition/aryl migration/desulfonylation of N-phenyl-N-(phenylsulfonyl)methacrylamide with primary, secondary, and tertiary carboxylicacids was described. The protocol provides an efficient approach for the synthesis of α-all-carbon quaternary stereocenters amides and isoquinolinediones. It was proposed that the radical generated from the silver-catalyzed decarboxylation was involved in the sequence