Nucleophilic (Phenylsulfonyl/arylthio)difluoromethylation of Aldehydes with TMSCF<sub>2</sub>Br: A Three-Component Strategy
作者:Qiqiang Xie、Ziyue Zhu、Chuanfa Ni、Jinbo Hu
DOI:10.1021/acs.orglett.9b03520
日期:2019.11.15
(phenylsulfonyl/arylthio)difluoromethylation of aldehydes with TMSCF2Br was developed. The reaction proceeds through in situ generation of difluorocarbene, which is captured by PhSO2Na or ArSNa to form the corresponding PhSO2CF2- or PhSCF2- anions, followed by nucleophilic addition to aldehydes to give the desired difluoromethylated products.
Difluoro(phenylchalcogen)methylation of aldehydes, ketones, and imines with S-, Se-, and Te-containing reagents PhXCF2H (X=S, Se, Te)
作者:Mingyou Hu、Fei Wang、Yanchuan Zhao、Zhengbiao He、Wei Zhang、Jinbo Hu
DOI:10.1016/j.jfluchem.2011.08.007
日期:2012.3
prepared, and their relativereactivity towards aldehydes, ketones, and imines was investigated. Compared to the former developed (phenylchalcogen)difluoromethylation reagents, these reagents are relatively easily available and more atom-economical in fluoroalkylation reactions. It was found that the efficient nucleophilic (phenylchalcogen)difluoromethylation of aldehydes, ketones, and imines could be
Direct nucleophilic gem-difluoro(phenylsulfanyl)methylation of carbonylcompounds has been achieved by use of difluoro(phenylsulfanyl)methane (PhSCF2H) and the phosphazenebase P4-tBu in THF. Non-enolizable aldehydes and ketones are suitable substrates to undergo nucleophilic gem-difluoro(phenylsulfanyl)methylation, providing α-gem-difluoromethylated adducts in good yields. In addition, this methodology