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Pharmaceuticals 2011, 4(8), 1158-1170; doi:10.3390/ph4081158

Synthesis and Biological Screening of 4-Benzyl-2H-phthalazine Derivatives

Chemistry Department, Faculty of Science, Al-Azhar University, 11884, Nasr City, Cairo, Egypt
Chemistry Department, Faculty of Science, Jazan University, 2097, Jazan, Saudi Arabia
Chemistry Department, Faculty of Medicine, Jazan University, 82621, Jazan, Saudi Arabia
Chemistry Department, Faculty of Science, King Khalid University, 9004, Abha, Saudi Arabia
Author to whom correspondence should be addressed.
Received: 20 June 2011 / Revised: 13 July 2011 / Accepted: 13 July 2011 / Published: 17 August 2011
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Preparation of 4-benzyl-2-substituted phthalazin-1-one derivatives 2-8 is reported. Condensation of 4-benzyl-1-chlorophthalazine (9) with a series of different nucleophiles gave 4-benzylphthalazin-1-ylamino derivatives (10-13 and 16) and 4-amino-2-[N'-(4-benzylphthalazin-1-yl)-hydrazino]-6-arylpyrimidine-5-carbonitriles (14a,b). Interaction of 9 with ambident anions was also studied. 5-Benzyl-6,6a,12-triazobenzo[a]-anthracen-7-one (15) is obtained from 9 and anthranilic acid derivatives. Treatment of 16 with (EtO)3CH/Ac2O under reflux afforded the corresponding ethoxymethylene derivative 17, while aqueous ammonium hydroxide treatment afforded carboxamide derivative 18. The structures of the newly synthesized derivatives were confirmed by their elemental analysis, IR, 1H NMR, 13C NMR and mass spectral studies. Antimicrobial activities of some selected compounds were also studied and some of these were found to exhibit promising effects against Gram-positive and Gram-negative bacteria and fungi. View Full-Text
Keywords: phthalazine derivatives; anthracene derivatives; synthesis; antimicrobial activity phthalazine derivatives; anthracene derivatives; synthesis; antimicrobial activity

This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

El-Wahab, A.H.A.; Mohamed, H.M.; El-Agrody, A.M.; El-Nassag, M.A.; Bedair, A.H. Synthesis and Biological Screening of 4-Benzyl-2H-phthalazine Derivatives. Pharmaceuticals 2011, 4, 1158-1170.

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