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
Metal-free catalytic activation of inert C(sp3)–H/elimination of SO2/C–C bond formationviaa free radical process were achieved in sequence.
无金属催化激活惰性C(sp3)-H/ SO2消除/ C-C键形成通过自由基过程实现了顺序。
Arylphosphonylation and Arylazidation of Activated Alkenes
作者:Wangqing Kong、Estíbaliz Merino、Cristina Nevado
DOI:10.1002/anie.201311241
日期:2014.5.12
Two radical‐mediated processes of activatedalkenes, namely arylphosphonylation and arylazidation, are described. The difunctionalization of alkenes by a tandem process that involves radical addition, 1,4‐aryl migration, and desulfonylation generates α‐aryl‐β‐heterofunctionalized amides bearing a quaternarystereocenter when the substituent on the nitrogen atom is an aryl group. Alternatively, heterooxindoles
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