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For the first time, an N 4 -amino derivative of 1,2,4,6-thiatriazine 1,1-dioxide (5) was prepared by cyclocondensation reaction of the appropriate sulfamoylcarbamate (3) with hydrazine. Reaction of 3 with ammonia yielded the cyclic 4H-derivative (4). Nucleophilic substitution reactions of 4 and 5 with hydrazine, as well as condensation of 5 with ethyl orthoformate were achieved. The antiprotozoal...
2-(2,3-Dideoxy-β-D-ribofuranosyl)pyridine-4-carboxamide (2) was synthesized starting from the protected sugar analogue (3). Coupling of this compound with 2-lithio-4-(4,5-dihydro-4,4-dimethyloxazol-2-yl)pyridine (4), subsequent mesylation, reduction, deprotection and ammonolysis gave (2) as an anomeric mixture. α/β-Separation was done by semi preparative hplc on a Lichrosorb 10 RP 8 column. In...
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