One pot synthesis of unsaturated enaminoketoesters or of pyridines in the tin(IV) chloride-promoted reactions of β-ketoesters with α,β-unsaturated nitriles
作者:Augusto C Veronese、Carlo F Morelli、Marino Basato
DOI:10.1016/s0040-4020(02)01281-4
日期:2002.11
promotes the nucleophilic attack of methyl acetoacetate to the cyano instead of the olefinic carbon atom of α,β-unsaturatednitriles to give enaminoketoesters. In the presence of an excess of ketoester a second C–C bond formation occurs followed by cyclisation affording substituted pyridines in a selective cascade sequence.