Abstract Acylation of (3 H, 5 H)-tetrahydrothiophene-2, 4-dione (thiotetronic acid) with acetyl, propionyl, and valeryl chlorides followed by OC isomerization in the presence of 4- dimethylaminopyridine or acetone cyanohydrin gave rise to 3-acetyl, 3-propanoyl, and 3- pentanoyl derivatives of thiotetronic acid. The reaction of 3-acylthiotetronic acids with diazomethane afforded enol methyl ethers at the endocyclic keto groups. The subsequent ...
