Cathodic generation of reactive (phenylthio)difluoromethyl species and its reactions: mechanistic aspects and synthetic applications
作者:Sadanobu Iwase、Shinsuke Inagi、Toshio Fuchigami
DOI:10.3762/bjoc.18.88
日期:——
The cathodic reduction of bromodifluoromethyl phenylsulfide (1) using o-phthalonitrile as a mediator generated the (phenylthio)difluoromethyl radical, which reacted with α-methylstyrene and 1,1-diphenylethylene to provide the corresponding adducts in moderate and high yields, respectively. In contrast, chemical reduction of 1 with SmI2 resulted in much lower product yields. The detailed reaction mechanism
以邻苯二甲腈为介体对溴二氟甲基苯硫醚(1)进行阴极还原生成(苯硫基)二氟甲基自由基,该自由基与α-甲基苯乙烯和1,1-二苯基乙烯反应分别以中等和高产率提供相应的加合物。相比之下,用 SmI 2对1进行化学还原会导致产品产率低得多。基于在氘代乙腈 CD 3 CN存在下1的阴极还原阐明了详细的反应机理。
<i>N</i>-Tosyl-<i>S</i>-difluoromethyl-<i>S</i>-phenylsulfoximine: A New Difluoromethylation Reagent for S-, N-, and C-Nucleophiles
作者:Wei Zhang、Fei Wang、Jinbo Hu
DOI:10.1021/ol900567c
日期:2009.5.21
The first alpha-difluoromethyl sulfoximine compound, 2, was successfully prepared by using the copper(II)-catalyzed nitrene transfer reaction. Compound 2 was found to be a novel and efficient difluoromethylation reagent for transferring the CF2H group to S-, N-, and C-nucleophiles. Deuterium-labeling experiments suggest that a difluorocarbene mechanism is involved in the current difluoromethylation reactions.
RICO, I.;WAKSELMAN, C., TETRAHEDRON, 1981, 37, N 24, 4209-4213