E,Z-Isomers of 3-ethoxy-4,4,4-trifluorobut-2-enenitrile and N-methylpyrrolidines derived from themстатья
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Дата последнего поиска статьи во внешних источниках: 10 августа 2018 г.
Аннотация:3-Ethoxy-4,4,4-trifluorobut-2-enenitrile was synthesized by the Wittig reaction of ethyl trifluoroacetate and (cyanomethylidene)triphenylphosphorane and was separated to individual E- and Z-isomers by rectification. Each isomer undergoes stereospecific 1,3-dipolar cycloaddition to N-methyl(methaniminio)-N-methylide generated in situ to give E- and Z-isomers of 4-cyano-3-ethoxy-3-trifluoromethyl-1-methylpyrrolidine.