HIGHLY DIASTEREOSELECTIVE SYNTHESIS OF DI-AND TRISUBSTITUTED 4-BUTANOLIDES FROM ALDEHYDES AND KETONES VIA THREE-CARBON-EXTENSION BY ALLYLIC HOMOENOLATE REAGENTS

Article abstract of DOI:10.1016/S0040-4039(00)81745-1

Lithiated or titanated O-allyl carbamates 7 or 8 add to aldehydes and ketones regio- and diastereoselectively to yield-O-(4-hydroxy-1-alkenyl)carbamates 9, which are converted to γ-lactones 12 with an one-pot procedure.