cin is reported here; it involves diastereoselective phenylsulfanylpropylation of an enolate anion derivedfrommethyl (2R,5R,6R)-5,6-dimethoxy-5,6-dimethyl[1,4]dioxane-2-carboxylate, obtained from d-mannitol, and is followed by sulfide oxidation, intramolecular acylation of the α-sulfinyl carbanion, sulfoxide elimination, and hydrolysis. Straightforward access to substituted analogues of (+)-4-desoxypentenomycin