Reduction of α-fluoro α,β-unsaturatedaldehydes, esters and ketones to the corresponding saturated compounds is readily achieved by catalytic hydrogenation on Pd/C. The same reduction with α,β-difluoro α,β- unsaturated ketones gives various results depending on the solvent.
Phosphonium supported triphenylphosphine reagent: an improved access to α-fluoro-α,β-unsaturated esters
作者:Ludivine Zoute、Céline Lacombe、Jean-Charles Quirion、André B. Charette、Philippe Jubault
DOI:10.1016/j.tetlet.2006.09.008
日期:2006.11
efficiently synthetized via diethylzinc-promoted Wittigreaction using a phosphonium-supported triphenylphosphine SCG–PPh31, which possesses similar reactivity as its parent analog triphenylphosphine. The main advantage of this system is the use of a novel low-molecular-weight support that is soluble in solvents of medium polarities for the attachment of reagents and insoluble in solvents of low polarities
ONE-POT SYNTHESIS OF α-FLUORO-α,β-UNSATURATED ESTERS FROM CHLOROMALONIC ESTER AND CARBONYL COMPOUNDS USING “SPRAY-DRIED” POTASSIUM FLUORIDE
作者:Tomoya Kitazume、Nobuo Ishikawa
DOI:10.1246/cl.1981.1259
日期:1981.9.5
α-Fluoro-α,β-unsaturated esters were prepared by one-pot reaction between aldehydes or ketones and diethyl chloromalonate in the “spray-dried” potassium fluoride–sulfolane system.