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Pharmaceuticals 2011, 4(7), 1032-1051; doi:10.3390/ph4071032
Article

The Uses of 2-Ethoxy-(4H)-3,1-benzoxazin-4-one in the Synthesis of Some Quinazolinone Derivatives of Antimicrobial Activity

1, 2,* , 1 and 1
Received: 5 May 2011 / Revised: 29 June 2011 / Accepted: 4 July 2011 / Published: 14 July 2011

Abstract

The behavior of 2-ethoxy-(4H)-3,1-benzoxazin-4-one (1) towards nitrogen nucleo-philes, e.g. ethanolamine, aromatic amines (namely: p-toluidine, p-anisidine, p-hydroxyaniline, o-hydroxyaniline, o-bromoaniline, o-phenylenediamine, p-phenylene- diamine, o-tolidinediamine) p-aminobenzoic acid, glucosamine hydrochloride,  2-amino- nicotinic acid, 1-naphthalenesulfonic acid hydrazide, n-decanoic acid hydrazide, benzoic acid hydrazide, semicarbazide, aminoacids (e.g. D,L-alanine, L-asparagine, L-arginine) and derivatives of 2-aminothiodiazole has been investigated. The behavior of the benzoxazinone towards a selected sulfur nucleophile, L-cysteine, has also been discussed. Formation of an amidine salt as a reaction intermediate has been assumed. The effect of solvent in some reactions has been elucidated. The structures of all the novel quinazoline and quinazolinone derivatives, obtained by heterocyclic ring opening and ring closure were inferred by the IR, MS as well as 1H-NMR spectral analysis. Moreover, the antimicrobial potential of some of the new synthesized derivatives has been evaluated.
Keywords: benzoxazinone; quinazolinone; aminothiadiazole; nucleoside; antimicrobial benzoxazinone; quinazolinone; aminothiadiazole; nucleoside; antimicrobial
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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El-Hashash, M.A.; Darwish, K.M.; Rizk, S.A.; El-Bassiouny, F.A. The Uses of 2-Ethoxy-(4H)-3,1-benzoxazin-4-one in the Synthesis of Some Quinazolinone Derivatives of Antimicrobial Activity. Pharmaceuticals 2011, 4, 1032-1051.

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