Abstract 2-Phosphoryl-(2–4), 2-sulfinyl-(5) and 2-sulfonyl-2, 3-alkadienoates (6 and 7) were prepared in an one-pot reaction by a [2, 3]-sigmatropic rearangement of the heteroatom- substituted 2-alkynoates obtained from ethyl propynoate and subsequent treatment with lithium diisopropylamide, ketone, trimethylchlorosilane and phosphorus-or sulfur-containing chloride.
