Nucleophilic difluoro(phenylsulfonyl)methylation of carbonyls with PhSO2CF2H reagent in the presence of in situ generated substoichiometric amount of base
摘要:
The reactions between carbonyl compounds and PhSO2CF2H using substoichiometric amount of base in situ generated from N(TMS)(3) and catalytic amount of Me4NF have been investigated. It is found that both enolizable and non-enolizable aldehydes are suitable substrates to undergo nucleophilic difluoro(phenylsulfonyl)methylation. Compared to the previously reported trifluoromethylation of carbonyls with CF3H under the similar reaction conditions, the unique reactivity of PhSO2CF2H is attributed to its higher acidity than CF3H and the reversibility of its addition reaction with ketones under basic conditions. (C) 2013 Elsevier B.V. All rights reserved.
Preparation of 1-aryl-2,2-difluoro enol esters via dehydrosulfonylation of α-(phenylsulfonyl)difluoromethylated benzoates
作者:Laijun Zhang、Ya Li、Jinbo Hu
DOI:10.1016/j.jfluchem.2007.03.004
日期:2007.7
1-Aryl-2,2-difluoro enolbenzoates 4 has been prepared from α-(phenylsulfonyl)-difluoromethylated benzoates 3, which can be readily obtained from the reactions between simple aldehydes and PhSO2CF2H (or TMSCF2SO2Ph). 2,2-Difluoro enol esters 4 are relatively more stable compounds than 2,2-difluoro enol sily ethers, and they promise to act as interesting fluorinated building blocks for further elaborations
由α-(苯磺酰基)-二氟甲基化的苯甲酸酯3制备了1-芳基-2,2-二氟烯醇苯甲酸酯4,可以通过简单的醛与PhSO 2 CF 2 H(或TMSCF 2 SO 2 Ph )。2,2-二氟烯醇酯4是比2,2-二氟烯醇硅醚相对更稳定的化合物,它们有望作为有趣的氟化结构单元进行进一步的修饰。
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.