Indium-catalyzed enantioselective allylation of aldehydes with β-carbonyl allylstannanes: An efficient synthetic method for chiral α-methylene-γ-lactones

The catalytic enantioselective allylation of aldehydes with β-carbonyl allyltributylstannanes in the presence of chiral indium complexes gave the optically active homoallylic alcohols, which can be converted to the corresponding optically active α-methylene-γ-butyrolactones.