Methyl thiophene-2-carboxylate, methyl 3-(thien-2-yl) acrylate, and methyl 5, 2'-bithiophene- 2-carboxylate were utilized as the synthetic equivalents of pentanoate 5-anion, pentanoate 4, 5-dianion, heptanoate 7-anion, and nonanoate-8, 9-dianion. By the promotion of samarium diiodide, these thiophene-incorporating compounds reacted with aldehydes, ketones, and conjugated esters regioselectively at the thienyl rings. Long-chain esters ...
