A fast and simple procedure for the synthesis of pyrimidinone derivatives via the cyclocondensation reactions of α-oxoketenes with 2-substituted benzothiazoles have been investigated. Acyl-substituted Meldrum's acids and 1,3-dioxin-4-one derivatives have been used as starting compounds for preparation of α-oxoketenes, which were used in the cycloaddition reactions with (benzothiazol-2-yl)-acetonitrile and (benzimidazol-2-yl)acetonitrile giving good product yields. Also the reaction of (chlorocarbonyl)phenylketene with 2-(1,3-benzothiazol-2-yl)acetonitrile has been investigated.
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Published in Khimiya Geterotsiklicheskikh Soedinenii, 2016, 52(1), 41–44
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Zahedifar, M., Sheibani, H. Reaction of α-oxoketenes with 2-substituted benzothiazoles and benzimidazoles: synthesis of benzo[4,5]thiazolo[3,2-a]pyridinone and N-(1,3-benzothiazol-2-yl)-3-oxopropanamide derivatives. Chem Heterocycl Comp 52, 41–44 (2016). https://doi.org/10.1007/s10593-016-1829-3
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DOI: https://doi.org/10.1007/s10593-016-1829-3