Synthesis of Difluorinated Halohydrins by the Chemoselective Addition of Difluoroenolates to α-Haloketones
作者:Munia F. Sowaileh、Maali D. Alshammari、David A. Colby
DOI:10.1021/acs.orglett.1c01636
日期:2021.7.2
α-Haloketones are valuable intermediates in the synthesis of pharmaceuticals and natural products because they display two electrophiles. Although chemoselective additions to each of these functional groups are known, the use of fluorinated nucleophiles has not been characterized, except for the dimerization of fluorohalomethyl ketones. Our studies demonstrate the use of difluoroenolates to create
with excellent stereoselectivity. The 1‐benzoyldifluoromethyl‐2,2‐diphenylethylene products synthesized through a radical reaction process are versatile synthons for the construction of various fluorine‐containing compounds, which have antiproliferative activity on human tumor cells.
Synthesis of α,α-difluoro-β-amino carbonyl-containing sulfonamides and related compounds
作者:Chen Xie、Lingmin Wu、Jie Zhou、Haibo Mei、Vadim A. Soloshonok、Jianlin Han、Yi Pan
DOI:10.1016/j.jfluchem.2015.01.004
日期:2015.4
Mannich addition reactions between in situ generated α,α-difluoroenolates and various N-sulfonyl imines readily occur with exceptionally high reaction rates at ambient temperature. The method features remarkable generality and enjoys operationally convenient conditions underscoring its practicality and methodological importance for preparation of sulfonamides bearing β-amino-α,α-difluoro ketone moiety
Microwave-Assisted Copper Catalysis of α-Difluorinated <i>gem</i>-Diol toward Difluoroalkyl Radical for Hydrodifluoroalkylation of <i>para</i>-Quinone Methides
gem-diols by single electron oxidation. Under microwave irradiation, a catalytic amount of oxidant Cu(OAc)2 succeeds in the formation of transient difluoroalkyl radicals in situ, for the first time. The reaction features a simple protocol, short reaction time, scalability, and high yield. The synthetic utility of this new methodology was also explored for the synthesis of difluoroalkylated spiro-cyclohexadienones
Synthesis of α,α-difluorobenzoyl oxygen heterocycles via the radical reaction of 2-iodo-2,2-difluoroacetophenones with unsaturated acids or unsaturated alcohols
A convenient and facile method for the direct synthesis of α,α-difluorobenzoyl lactones or cyclic ethers via the radical cyclization reaction of 2-iodo-2,2-difluoroacetophenone with unsaturated acids or alcohols was reported.