The first example of an asymmetric intramolecular Michaeladdition reaction with use of α-lithiated vinylic sulfoxide as a Michael donor is reported. Michaeladdition of the α-lithiated vinylic sulfoxide to (Z)-enoates proceeds with high diastereoselectivity to give the adducts with (R)-configuration at the β-position of the ester in the five-membered-ring formation. The selectivity was reversed in
Convenient Preparations of (Diphenylphosphono)acetic Acid Esters and the Comparison of the <i>Z</i>-Selectivities of Their Horner−Wadsworth−Emmons Reaction with Aldehydes Depending on the Ester Moiety