Novel Pyranopyrazoles: Synthesis and Theoretical Studies

Novel Pyranopyrazoles: Synthesis and Theoretical Studies

Kadhum, Abdul Amir H.;Saed, Fouad M.;Ali, Wassan B.;Al-Bayati, Redah I.;Al-Amiery, Ahmed A.;Mohamad, Abu Bakar;
molecules 2012 Vol. 17 pp. 10377-10389
344
kadhum2012novelmolecules

Abstract

A series of pyranopyrazoles, namely, 7-(2-aminoethyl)-3,4-dimethyl-1-phenyl-1<em>H</em>-pyrazolo[3,4-b]pyridin-6(7<em>H</em>)-one (<strong>2</strong>), (<em>Z</em>)-3,4-dimethyl-1-(4-((4-nitrobenzylidene)amino)phenyl)pyrano[2,3-c]pyrazol-6(1<em>H</em>)-one (<strong>5</strong>), 1-(4-(3,4-dimethyl-6-oxopyrano[2,3-c]pyrazol-1(6<em>H</em>)-yl)phenyl)-3-(naphthalen-1-yl)urea (<strong>6</strong>), (<em>Z</em>)-ethyl 4-((3,4-dimethyl-6-oxo-1,6-dihydropyrano[2,3-c]pyrazol-5-yl)diazenyl)benzoate (<strong>8</strong>) and 3,4-dimethyl-<em>N</em>-(naphthalen-1-yl)-6-oxopyrano[2,3-c]pyrazole-1(6H)-carboxamide (<strong>9</strong>) were synthesized and characterized by means of their UV-VIS, FT-IR, <sup>1</sup>H-NMR and <sup>13</sup>C-NMR spectral data. Density Functional Theory calculations of the synthesized pyranopyrazoles were performed using molecular structures with optimized geometries. Molecular orbital calculations have provided detail description of the orbitals, including spatial characteristics, nodal patterns, and the contributions of individual atoms.

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