Abbas I.M.Abdallah M.A.Gomha S.M.Kazem M.S.H.Department of ChemistryFaculty of ScienceCairo UniversityGiza12613Egypt; Department of ChemistryFaculty of DentistryOctober University for Modern Science and Arts UniversityGiza12613Egypt2020-01-092020-01-0920170022152Xhttps://doi.org/10.1002/jhet.2968PubMed ID :https://t.ly/0EE9gScopusA new series of azolopyrimidine derivatives incorporating pyrazole moiety were synthesized by reaction of 1-(pyrazol-3-yl)-2-propenone with a number of heterocyclic amines in the presence of a catalytic amount of acetic acid. The mechanism of formation of the products was also discussed, and the structure assigned was elucidated based on both elemental and spectral analyses data. In addition, 7-(pyrazolyl)-2-thioxo-5-phenyl-1,3-dihydropyrido[2,3-d]pyrimidin-4-one was used as starting material for preparation of a new series of pyridotriazolopyrimidines via its reaction with a variety of hydrazonoyl chlorides in dioxane using triethylamines as catalyst. The assigned structure for these products was also proved via elemental analysis and spectroscopic techniques (IR, 1H NMR, and Mass). Moreover, the antimicrobial activity of some selected examples of the new products was evaluated, and the results obtained revealed high activity of compound 20a against the Gram positive bacteria Staphylococcus aureus and the Gram negative bacteria Klebsiella pneumonie. All the tested compounds have no antifungal activity. � 2017 Wiley Periodicals, Inc.English1 (pyrazol 3 yl) 2 propenone3 cinnamoyl 5 methyl 1 phenyl 1h pyrazole 4 carboxylate7 (pyrazolyl) 2 thioxo 5 phenyl 1,3 dihydropyrido[2,3 d]pyrimidin 4 oneacetic acidazolopyrimidine derivativeethyl 1,5 diphenyl 3 [2 phenyl 1,2 dihydrobenzo[4,5] imidazo[1,2 a]pyrimidin 4 yl]1h pyrazole 4 carboxylateethyl 1,5 diphenyl 3 [2 phenyl 2H benzo[4,5]thiazolo[3,2 a] pyrimidin 4 yl] 1h pyrazole 4 carboxylateethyl 1,5 diphenyl 3 [2 phenyl 2h pyrimido(1,2 a) pyrimidin 4 yl] 1h pyrazole 4 carboxylateethyl 1,5 diphenyl 3 [5 phenyl 4,5 dihydro [1,2,4]triazolo [1,5 a]pyrimidin 7 yl] 1h pyrazole 4 carboxylateethyl 1,5 diphenyl 3 [5 phenyl 4,5 dihydrotetrazolo [1,5 a]pyrimidin 7 yl] 1h pyrazole 4 carboxylateethyl 1,5 diphenyl 3 [7 phenyl 7h thiazolo(3,2 a)pyrimidin 5 yl] 1h pyrazole 4 carboxylateethyl 3 (2,5 diphenyl 4,5 dihydropyrazolo[1,5 a]pyrimidin 7 yl) 1,5 diphenyl 1h pyrazole 4 carboxylateethyl 3 [2 [(2,4 dioxopentan 3 yl)thio] 4 oxo 5 phenyl 3,4 dihydropyrido[2,3 d]pyrimidin 7 yl] 1,5 diphenyl 1h pyrazole 4 carboxylateethyl 3 [2 [[1,3 dioxo 1 (phenylamino)butan 2 yl]thio] 4 oxo 5 phenyl 3,4 dihydropyrido[2,3 d]pyrimidin 7 yl] 1,5 diphenyl 1h pyrazole 4 carboxylateethyl 5 methyl 1 phenyl 3 [2 phenyl 1,2 dihydrobenzo [4,5]imidazo[1,2 a]pyrimidin 4 yl] 1h pyrazole 4 carboxylateethyl 5 methyl 1 phenyl 3 [2 phenyl 2h benzo[4,5]thiazolo [3,2 a]pyrimidin 4 yl] 1h pyrazole 4 carboxylateethyl 5 methyl 1 phenyl 3 [2 phenyl 2h pyrimido(1,2 a) pyrimidin 4 yl] 1h pyrazole 4 carboxylateethyl 5 methyl 1 phenyl 3 [5 phenyl 4,5 dihydro [1,2,4]triazolo [1,5 a]pyrimidin 7 yl] 1h pyrazole 4 carboxylateethyl 5 methyl 1 phenyl 3 [5 phenyl 4,5 dihydrotetrazolo [1,5 a]pyrimidin 7 yl] 1h pyrazole 4 carboxylateethyl 5 methyl 1 phenyl 3 [7 phenyl 7h thiazolo(3,2 a) pyrimidin 5 yl] 1h pyrazole 4 carboxylateheterocyclic aminehydrazonoyl chloridepyrazolepyrido triazolo pyrimidinone derivativepyridotriazolopyrimidinepyrido[2,3 d][1,2,4]triazolo[4,3 a] pyrimidinonepyrimidine derivativepyrimidinone derivativetriethylamineunclassified drugunindexed drugantimicrobial activityArticlecatalysisdrug mechanismdrug structureelemental analysisinfrared spectroscopyKlebsiella pneumoniaemass spectrometrynonhumanproton nuclear magnetic resonancespectroscopyStaphylococcus aureussynthesisArticlehttps://doi.org/10.1002/jhet.2968PubMed ID :