ChemInform Abstract: Divergent Synthesis of Multisubstituted Tetrahydrofurans and Pyrrolidines via Intramolecular Aldol-Type Trapping of Onium Ylide Intermediates.
The corresponding title compounds are obtained through a metal—carbene-induced oxonium ylide or ammonium ylide formation followed by an intramolecular aldol-type trapping of these active intermediates.