β,γ-Dihalogenated unsaturatedacids were prepared regio- and stereoselectively from allenic acid, and some aspects of their reactivities were studied. α,β-unsaturated acids - halogenation - carboxylic acids - cross-coupling - organometallic reagents
Three-component reactions with 3,4-diiodoalk-2-enoic derivatives, primary amines, and terminal alkynes proceeded to give trisubstituted pyrroles in fair to good yields in the presence of palladium and copper catalysts under mild reaction conditions.