Iron‐Catalyzed Intermolecular Azidabenzoyl Difluoromethylation of Alkenes to Access
β
‐Difluoroacyl Azides
摘要:
AbstractA Fe(II)‐catalyzed three‐component reaction of 2‐iodo‐2,2‐difluoroacetophenones, alkenes and TMSN3 is described, which provides a particularly valuable route to access difluoroalkylated azides with high yields. The method permits the efficient azidation of varied β‐difluoroacyl‐benzylic radicals in mild conditions with high functional group tolerance. Preliminary mechanistic investigation indicated that a radical‐mediated process was involved in this azidadifluoroacylation reaction.
Cu(I)‐catalyzed three‐component reaction of 2‐iodo‐2,2‐difluoroacetophenones, alkynes, and TMSCN for the synthesis of useful difluoroacyl‐substituted nitriles is described. This method has broad substrate scope and excellent stereoselectivity. Preliminary mechanistic investigation indicated that a radical‐mediated process was involved in this cyanodifluoroalkylation reaction.
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.
A nickel-catalyzed aminofluoroalkylative cyclization of unactive alkenes with iododifluoromethyl ketones was developed to construct versatile difluoroalkylated Nitrogen-containing heterocycles including aziridines, pyrrolidines and piperidines in moderate to high yields. This method features a broad substrate scope and has been demonstrated on gram scale.
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