[GRAPHICS]The first example of an asymmetric intramolecular Michael addition reaction using cr lithiated vinylic sulfoxide as a Michael donor is reported. Michael addition of the alpha -lithiated vinylic sulfoxide to (Z)-enoates proceeds with high diastereoselectivity to give the adducts having a stereogenic center with (R)-configuration at the beta -position of the ester in the cyclopentene ring formation. The selectivity was reversed in the six-membered ring formation. On the other hand, the corresponding (E)-enoates provided Michael adducts with poor diastereoselectivity.