Reductive Homocondensation of Benzylidene- and Alkylidenepyruvate Esters by a P(NMe2)3-Mediated Tandem Reaction
摘要:
A reductive homocondensation of E-benzylidenepyruvate esters mediated by P(NMe2)(3) is described. The transformation, initiated by the Kukhtin-Ramirez addition of the phosphorus reagent to the vinyl-substituted alpha-dicarbonyl substrate, proceeds via a resonance delocalized oxyphosphonium dienolate intermediate to provide access to diverse oxygenated heterocycles as a function of the substituent.