摘要:
Synthesis of (E,Z)-alpha-Alkylidene-beta-ethoxycarbonyl cyclopentanones 5 and(E,Z)-alpha-alkylidene-gamma-butyrolactones 7 by condensing phosphonates 3 or 6 with a variety of aldehydes in the presence of aqueous potassium carbonate (6-10M) as base is reported.