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Communication | Regular issue | Vol 2, No. 3, 1974, pp.309-313
Published online, 1st January, 1970
DOI: 10.3987/R-1974-03-0309
■ Reaction of Methyl 2,3-Dihydro-3-methyl-2-methylenebenzothiazole-α-dithiocarboxylate with Dimethyl Acetylenedicarboxylate

Goro Kobayashi,* Yoshiro Matsuda, Yoshinori Tominaga, and Kazumichi Mizuyama

*Faculty of Pharmaceutical Sciences, Nagasaki University, 1-14, Bunkyo-machi, Nagasaki 852-8521, Japan

Abstract

Treatment of methyl 2,3-dihydro-3-methyl-2-methylenebenzothiazole-α-dithiocarboxylate with dimethyl acetylenedicarboxylate in dimethylformamide resulted in a Diels-Alder cycloaddition which were followed by desulfurization. This product is a spiro-compound 2,3-dimethoxycarbonyl-4-methylthio-2,4-cyclopentadiene-1-spiro-2-(2,3-dihydro-3-methylbenzothiazole).