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New 5H-[1,3]thiazolo[3,2-a]pyrido[3,2-e]pyrimidine derivatives as diuretics

Monge, A.; Martinez-Merino, V.; Sanmartin, C.; Ochoa, M.C.; Fernandez-Alvarez, E.

Arzneimittel-Forschung 40(12): 1349-1352

1990

ISSN/ISBN: 0004-4172
PMID: 2095131
Document Number: 358692
New 5H-[1,3]thiazolo[3,2-a]pyrido[3,2-e]pyrimidines 1 and 6,10-dihydro-5H-pyrido[3',2':5,6]pyrimido[2,1-c] [1,2,4]triazines 4 with 5-one, 5-thione or 5-hydrazono substituents and in some cases 1,2,3,4 or 8,9 hydrogenated are synthetized. The diuretic, natriuretic and kaliuretic activities of these compounds in Wistar rats at a dose of 24 mg/kg were estimated. A series of 24 possible derivatives of 1 and 4 possessing diuretic and saliuretic activities are investigated for structure-activity relationships in light of Fujita-Ban model. The Fujita-Ban group contributions have been calculated for different structural variations on the parent ring 1a. It is observed that the hydrogenation of pyridine, [1,3]thiazole or [1,2,4]triazine rings on 1 or 4 decrease the diuretic and saliuretic activities.

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