PIERRE DESLONGCHAMPS and BERNARD L. ROY. Can. J. Chem. 64, 2068 (1986). The base-catalyzed (Cs2C03 in THFIDMF) intramolecular Michael addition of P-ketoester-ynones 7-10 and -enone 11 is reported. Macrocyclization (Table I), which produces the corresponding