Mannich reaction in the synthesis of N,S-containing heterocycles. 14*. Unexpected formation of thiazolo[3,2-a]pyridines in the aminoalkylation of N-methylmorpholinium 4-aryl-3-cyano-6-oxo-1,4,5,6-tetrahydropyridine-2-thiolates by isobutyraldehyde and primary amines |
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Authors: | V V Dotsenko S G Krivokolysko |
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Institution: | 1. “ChemEx Laboratory”, Vladimir Dal’ East-Ukrainian National University, 20-A/7 Molodezhny Kv., Lugansk, 91034, Ukraine
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Abstract: | Treatment of N-methylmorpholinium 4-aryl-3-cyano-6-oxo-1,4,5,6-tetrahydropyridine-2-thiolates with an excess of isobutyraldehyde and primary aromatic amines in refluxing ethanol gives the corresponding 7-aryl-3-arylamino-2,2-dimethyl-5-oxo-2,3,6,7-tetrahydro-5 H-thiazolo3,2-a]pyridine-8-carbonitriles in 18-38 % yields. |
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