method for the first direct insertion of difluorcarbene, generated from TMSCF3, into diselenides and disulfides is disclosed, producing novel difluoromethyl diselenoacetals and difluoromethyl dithioacetals. The reaction conditions tolerate a range of synthetically useful and biologically relevant functional groups. The process is scalable, with two representative compounds prepared at a gram-scale in
SRN1 substitutions of halogenoperfluoroalkanes (CF3Br or CF2 Cl2) under pressure
作者:Claude Wakselman、Marc Tordeux
DOI:10.1039/c39840000793
日期:——
Radical chain fluoralkylation of arenethiolates by CF2Br or CF2Cl2, performed under slight pressure in a glass apparatus, gives aryl poyfluoromethyl sulphides.
Synthesis of bromodifluoromethyl phenyl sulfide, sulfoxide and sulfone [1]
作者:Donald J. Burton、Denise M. Wiemers
DOI:10.1016/s0022-1139(00)82673-1
日期:1981.10
Sodium thiophenoxide reacts with dibromodifluoromethane to give bromodifluoromethyl phenyl sulfide. Peracid oxidation of the sulfide gives the corresponding sulfoxide and sulfone. The formation of the sulfide is suggested to proceed attack of thiophenoxide on halogen to produce difluorocarbene. Capture of carbene by thiophenoxide followed by a second positive halogen abstraction reaction yields the
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。
Difluoromethyl Phenyl Sulfone as a Selective Difluoromethylene Dianion Equivalent: One-Pot Stereoselective Synthesis ofanti-2,2-Difluoropropane-1,3-diols
作者:G. K. Surya Prakash、Jinbo Hu、Thomas Mathew、George A. Olah