A novel method for the synthesis of 2,2-diaryl-1,1-difluoroethenes
作者:Ji Hoon Choi、In Howa Jeong
DOI:10.1016/j.tetlet.2007.12.028
日期:2008.2
β,β-Difluoro-α-phenylvinylstannane 3 was prepared in 60% yield from the reaction of β,β-difluoro-α-phenylvinylsulfone 2 with tributyltin hydride in refluxing benzene for 5 h. The cross-coupling reaction of 3 with aryl iodides bearing substituents such as proton, fluoro, chloro, bromo, methoxy, methyl, trifluoromethyl, and nitro on ortho, meta, para positions of the benzene ring in the presence of 10 mol %
Reaction of Diazo Compounds with Difluorocarbene: An Efficient Approach towards 1,1-Difluoroolefins
作者:Zhikun Zhang、Weizhi Yu、Chenggui Wu、Chengpeng Wang、Yan Zhang、Jianbo Wang
DOI:10.1002/anie.201509711
日期:2016.1.4
e difluoromethylenation of diazocompounds that proceeds under mild conditions has been developed and is based on the use of TMSCF2Br as the difluoromethylene source and tetrabutylammonium bromide (TBAB) as the promoter. The chemoselective formal carbene dimerization reaction is achieved owing to the electronic properties and the relative stability of the difluorocarbene intermediate.
Rh(I)-Catalyzed Reaction of Trifluoromethylketone <i>N</i>
-Tosylhydrazones and Arylboronates
作者:Zhikun Zhang、Weizhi Yu、Qi Zhou、Tianjiao Li、Yan Zhang、Jianbo Wang
DOI:10.1002/cjoc.201500889
日期:2016.5
Rh(I)‐Catalyzed synthesis of 1,1‐difluoro‐2,2‐diarylalkenes from trifluoromethylketone N‐tosylhydrazones and arylboronates is presented in this communication. This new synthetic method is based on the Rh(I)‐carbene migratory insertion followed by β‐fluorideelimination. In one particular case the protonation occurs instead of β‐fluorideelimination, affording 2,2‐diaryl trifluoroethane product.