iododifluoromethyl ketones with α, β-unsaturatedketones, which provides an obviously significant route to access 1,2-addition product with excellent regioselectivity. This method has a wide range of substrate scope, good efficiency, and mild reaction conditions. In addition, this method was applied to the synthesis of difluoro derivatives of biologically active molecules containing unsaturated ketone structures
Indium-mediated Barbier-type allylation of halogenated difluoroacetophenone is reported for the first time. This method can directly and conveniently access homoallylic difluorohydrin alcohol blocks from halogenated difluoroacetophenones, and has good functional group compatibility. As a novel difluoromethylation reagent, the block has potential in the synthesis of fluorinated compounds.
Synthesis of α-Halo-α,α-difluoromethyl Ketones by a Trifluoroacetate Release/Halogenation Protocol
作者:Jinu P. John、David A. Colby
DOI:10.1021/jo2017179
日期:2011.11.4
Three series of alpha-halo-alpha,alpha-difluoromethyl ketones are prepared from highly alpha-fluorinated gem-dials by exploiting the facile release of trifluoroacetate, followed by immediate trapping of the liberated alpha,alpha-difluoroenolate with an electrophilic chlorine, bromine, or iodine source. The products are typically isolated in good yields, even in the case of sensitive, alpha-iodo-alpha,alpha-difluoromethyl ketones. Also, we demonstrate that an alpha-iodo-alpha,alpha-difluoromethyl ketone will participate in a copper-promoted reaction to forge a new carbon-carbon bond.
Design, synthesis and biological evaluation of difluoroalkylated protoilludanes obtained by a practical radical cascade difluoroalkylation-cyclization reaction