A palladium-catalyzedone-pot difunctionalization of alkynes with α,α-iododifluoroacetones is introduced for the synthesis of difluorinated 1,3-enynes. The reaction proceeds through the radical addition of RCOCF2 radical to alkynes and subsequent Sonogashiracoupling with the same alkynes to give the 1,3-enyne products with high regio and stereoselectivity.
Cobalt Catalyzed Addition of α, α-Difluoroiodomethyl Ketones to Alkenes/ Alkynes
作者:Jun Pan、Hanyang Li、Jingjing Wu、Fanhong Wu
DOI:10.1016/j.jorganchem.2021.121818
日期:2021.7
difluoroalkylation reaction of alkenes/alkynes with difluoroacyl iodides was reported, which provided an efficient and convenient access to diverse α, α-difluoroketone derivatives. The mild conditions allow for a broad substrate scope including alkenes and alkynes, as well as good functional group toleration. Mechanism investigation showed that a difluoroalkyl radical is formed in the reaction pathway.
Ni‐catalyzed radicaldifunctionalization of alkenes with iododifluoromethylketones was realized for the synthesis of α,α‐difluoroketones. This reaction can also be used for the construction of analogs containing 5‐membered heterocycles through radical addition and sequenced cyclization reactions.