some 2(3H)-indolizinone derivatives to α,β-unsaturated nitriles, esters, and an amide gave the corresponding double Michael adducts, 3,3-disubstituted 2(3H)-indolizinones, in moderate to high yields, and those to methyl vinyl ketone afforded further condensed products, spiro[cyclohexane-1,3′(2′H)-indolizin]-2′-ones, instead of the expected 1:2 adducts. On the other hand, the reactions of the indolizinones