CONJUGATE ADDITION OF THIOLS AND MALONATES TO THIOCINNAMATES UNDER PTC CONDITIONS
作者:Liliana Marzorati、Marcos Carlos de Mattos、Blanka Wladislaw、Claudio Di Vitta
DOI:10.1081/scc-120003641
日期:2002.1
ABSTRACT Addition of thiols or diethylmalonate to thiocinnamate, under solid–liquid PTC conditions, afforded the corresponding 1,4-adducts in moderate to good yields. A 2-pyrrolidinone was obtained using diethyl N-acetamidomalonate as Michael donor, via intramolecular cyclization of the parent adduct.
Rongalite (R) promotes cleavage of diaryldisulfides generating the corresponding chalcogenolate anions that then undergo facile reaction with N-acylbenzotriazoles in the presence of K(2)CO(3) to afford thioesters in good to excellent yields. The important features of this methodology are no requirement of metal catalysts, without any expensive reagent and high yields. It is noteworthy that the reactions of diphenyl diselenide with N-acylbenzotriazoles are also conducted to afford selenoesters in good yields under the standard conditions.