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Communication | Regular issue | Vol 16, No. 4, 1981, pp.537-538
Published online, 1st January, 1970
DOI: 10.3987/R-1981-04-0537
Cycloaddition of Thiazolo[3,2-a]benzimidazole and Imidazo[2,1-b]benzothiazole with Methyl Propiolate; Formation of Thiazolo[3,2-a][1,5]benzodiazepine and [1,4]Diazepino[7,1-b]benzothiazole

Noritaka Abe* and Tarozaemon Nishiwaki

*Department of Chemistry, Faculty of Science, Yamaguchi University, 1677-1 Yoshida, Yamaguchi 753-8512, Japan

Abstract

3-Methylthiazolo[3,2-a]benzimidazole and 2-methylimidazo[2,1-b]benzothiazole, respectively, react with methyl propiolate to give 1:2-adducts which are characterized as methyl (Z)-11-(methoxycarbonyl)-3-methyl-10-thiazolo[3,2-a][1,5]benzodiazepinacrylate and methyl (Z)-5-(methoxycarbonyl)-2-methyl-4-[1,4]diazepino[7,1-b]benzothiazolacrylate.