Snthesis of Novel 5- and 6-Substituted 3-Arylidene-1,4-oxathiin-2(3H)-ones
The reactions of α-acetylthio-β-arylacrylic acids (2a-c) with α-halogeno ketones (3a-f), α-halogeno-β-keto esters (7a-b), and α-halogenopyruvate (9) afforded the corresponding novel 3-arylidene-1,4-oxathiin-2(3H)-ones (4a-d), (8a-f) and (10a), respective