Molecules 2008, 13(7), 1501-1517; doi:10.3390/molecules13071501
Article

Synthesis and Antimicrobial Activity of Some New Pyrazole, Fused Pyrazolo[3,4-d]-pyrimidine and Pyrazolo[4,3-e][1,2,4]- triazolo[1,5-c]pyrimidine Derivatives

1,* email, 2email, 3email and 1email
Received: 4 May 2008; in revised form: 21 July 2008 / Accepted: 22 July 2008 / Published: 29 July 2008
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Abstract: Hydrazonyl bromides 2a,b reacted with active methylene compounds (dibenzoylmethane, acetylacetone, ethyl acetoacetate, phenacyl cyanide, acetoacetanilide, ethyl cyanoacetate, cyanoacetamide and malononitrile) to afford the corresponding 1,3,4,5- tetrasubstituted pyrazole derivatives 5-12a,b. Reaction of 12a,b with formamide, formic acid and triethyl orthoformate give the pyrazolo[3,4-d]pyrimidine, pyrazolo[3,4- d]pyrimidin-4(3H)one and 5-ethoxymethylene-aminopyrazole-4-carbo-nitrile derivatives 13-15a,b, respectively. Compounds 15a,b reacted with benzhydrazide and hydrazine hydrate to afford pyrazolo[4,3-e][1,2,4]triazolo[1,5-c]pyrimidine and [4-iminopyrazolo- [3,4-d]pyrimidin-5-yl]amine derivatives 16a,b and 17a,b. Reactions of compounds 17a,b with triethyl orthoformate and carbon disulfide give the corresponding pyrazolo[4,3-e]- [1,2,4]triazolo[1,5-c]pyrimidine derivatives 18a,b and 19a,b, respectively.
Keywords: Hydrazonyl bromides; pyrazolo[3; 4-d]pyrimidine; pyrazolo[4; 3-e][1; 2; 4]- triazolo[1; 5-c]pyrimidine; antimicrobial activity.
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MDPI and ACS Style

Abunada, N.M.; Hassaneen, H.M.; Kandile, N.G.; Miqdad, O.A. Synthesis and Antimicrobial Activity of Some New Pyrazole, Fused Pyrazolo[3,4-d]-pyrimidine and Pyrazolo[4,3-e][1,2,4]- triazolo[1,5-c]pyrimidine Derivatives. Molecules 2008, 13, 1501-1517.

AMA Style

Abunada NM, Hassaneen HM, Kandile NG, Miqdad OA. Synthesis and Antimicrobial Activity of Some New Pyrazole, Fused Pyrazolo[3,4-d]-pyrimidine and Pyrazolo[4,3-e][1,2,4]- triazolo[1,5-c]pyrimidine Derivatives. Molecules. 2008; 13(7):1501-1517.

Chicago/Turabian Style

Abunada, Nada M.; Hassaneen, Hamdi M.; Kandile, Nadia G.; Miqdad, Omar A. 2008. "Synthesis and Antimicrobial Activity of Some New Pyrazole, Fused Pyrazolo[3,4-d]-pyrimidine and Pyrazolo[4,3-e][1,2,4]- triazolo[1,5-c]pyrimidine Derivatives." Molecules 13, no. 7: 1501-1517.


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