Abstract
AbstractThe condensation of some thienyl carbonyl compounds with dimethyl phenylsuccinate using either sodium hydride or potassium t‐butoxide as condensing agents, gave a stereoisomeric mixture of (E)‐ and (Z)‐half‐esters (3). The (E)‐half‐esters la‐c were either cyclised to the corresponding benzothiophene derivatives or hydrolysed to the (E)‐dibasic acids VIa‐e, which were cyclised to the corresponding anhydrides VIIa‐c. Methylation of VIIa,c gave the isomeric half‐esters VIIIa,c. The (Z)‐half‐ester Id can cyclise easily to the lactone IX.
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