A NEW METHOD FOR SYNTHESIS OF α,β-UNSATURATED δ-LACTONES VIA MICHAEL ADDITION USING METHYL (PHENYLSULFINYL)ACETATE

Variuos α,β-unsaturated δ-lactones were synthesized via Michael addition of methyl (phenylsulfinyl)acetate to alkyl vinyl ketones in the presence of tributylphosphine. For example, racemic massoia lactone was obtained in 49% overall yield.