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Synthesis and Reactions of Pyranobenzimidazole-2-thiones from Dehydroacetic Acid

Rachedine Kaoua,Norah Bennamane,Yann Le Gal, Fadela Balegroune,Thierry Roisnel,Dominique Lorcy,Bellara Nedjar-Kolli

INDIAN JOURNAL OF HETEROCYCLIC CHEMISTRY（2017）

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Abstract
An efficient synthesis of pyranobenzimidazole-2-thiones has been described through reaction of carbon disulfide or thiophosgene with enaminone. The alkylation of pyranobenzimidazole-2-thione in the presence of methyl iodide furnished the desired S-methylated derivatives, and the reaction of pyranobenzimidazole-2-thione with copper (I) iodide and triphenylphosphine gave a dimeric complex [Cu (PPh3) (bzimtH)](2).
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Key words
Benzimidazole-2-thione,Dehydroacetic acid,Triphenylphosphine,Carbon disulfide,Complex
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