Synthesis of fluorinatedanalogs of some dienic insect sex pherormones through a stereocontrolled Wittig reaction of β-fluorinated aldehydes with the appropriate ω-functionalized ylides is reported. Some features of the 1H and 19F NMR spectra of these analogs are also discussed.
据报道,通过β-氟化醛与适当的ω-官能化的乙炔的立体控制的Wittig反应,合成了一些二齿昆虫性信息素的氟化类似物。还讨论了这些类似物的1 H和19 F NMR光谱的某些特征。
Palladium catalysts are found to selectively hydrogenate fluoroolefins without hydrogenolyticcleavage of the carbon-fluorine bond Since a large number of methods are available for the preparation of unsaturated organofluoro compounds this constitutes a general synthetic route to sp3-fluorinated molecules.
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.
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.