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  1. No Access

    Article

    The use of anilinodihydrofurans in the synthesis of novel heterocyclic compounds

    Alkyl 4-oxo-2-phenylamino-4,5-dihydrofuran-3-carboxylates were used for the preparation of alkyl 5-amino-7-aryl-2-{[aryl(hydroxy)methyl](phenyl)amino}-4,6-dicyano-1-benzofuran-3-carboxylates, 4-oxo-2-phenylami...

    M. Hammouda, Z. M. Abou Zeid, H. A. Etman… in Chemistry of Heterocyclic Compounds (2011)

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    The use of 3-amino-4,6-dimethylpyrazolo[3,4-b]pyridine in the synthesis of novel heterocycles of pharmaceutical interest

    3-Amino-4,6-dimethylpyrazolo[3,4-b]pyridine was used for the preparation of some novel heterocycles of pharmaceutical interest. The starting material reacted with 2-cyano-3,3-bis(methylthio)acrylate, chloroace...

    M. A. Metwally, H. A. Etman, H. E. Gafer… in Chemistry of Heterocyclic Compounds (2008)

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    Article

    Ketene S,S-acetals in the synthesis of some new fused pyrimidine derivatives

    Condensation of ketene dithioacetal derivatives with some aminoazoles (5-aminotetrazole monohydrate, 2-aminobenzimidazole, 2-aminobenzothiazole, and 2-aminothiazole) in the presence or absence of triethylamine...

    M. A. Metwally, E. I. Desoky, R. Fawzy, H. A. Etman in Chemistry of Heterocyclic Compounds (2007)

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    Article

    Synthesis of new purine, pteridine, and other pyrimidine derivatives

    The reaction of malononitrile dimer with phenyl isothiocyanate gave (6-amino-1-phenyl-2-thioxo-1,2,3,4-tetrahydropyrimidin-4-ylidene)malononitrile which was then used as starting material in the synthesis of p...

    E. Abdel-Latif, H. M. Mustafa, H. A. Etman… in Russian Journal of Organic Chemistry (2007)

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    Article

    A new route for the synthesis of phenazine di-N-oxides

    Several phenazine 5,10-dioxides (7a–d) were prepared by the reaction of 2-methyl-3-acetylquinoxaline 1,4-dioxide (2) with different aromatic aldehydes or by direct cyclization of the quinoxaline cinnamoyl derivat...

    M. S. Abd El-Halim, A. S. El-Ahl, H. A. Etman… in Monatshefte für Chemie / Chemical Monthly (1995)

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    Article

    Synthesis of some new 4H-(pyrano and/or piperidino)[3,2-d] pyrazoles and pyrazolo[5,4-d] thiopyrans

    1,5-Diketones (3) underwent cyclization to 4H-pyrano[3,2-d]pyrazoles (4a−d), 4H-piperidino[3, 2-d]pyrazole (5) and pyrazolo[5,4-d]thiopyran (6) upon treatment with P2O5, CH3COONH4 and/or P2S5. Moreover, treatment...

    H. A. Etman, A. S. El-Ahl, M. A. Metwally in Archives of Pharmacal Research (1994)