The visible light mediated oxidation of 1,3,5-trisubstitutedpyrazolines under metal-free conditions was developed. Various substituted pyrazolines were oxidized to pyrazoles by irradiation with visible light/sunlight. A plausible mechanism was proposed for the light mediated oxidation proceeding via formation of intermediates with electron rich C-3 positions and electron deficient C-5 positions. Correlation
An unprecedented facile oxidation of 1,3,5-trisubstitutedpyrazolines and Hantzsch 1,4-dihydropyridines (DHPs) to the corresponding pyrazoles and pyridines was observed, mediated by 3,4-dihydro-2H-pyran in air. The reaction showed excellent reactivity, functional group tolerance, and high yield without using any metal and/or halogen based oxidizing agents.
Mishriky, Nawal; Asaad, Fahmy M.; Ibrahim, Yehia A., Indian Journal of Chemistry - Section B Organic and Medicinal Chemistry, 1996, vol. 35, # 9, p. 935 - 940
作者:Mishriky, Nawal、Asaad, Fahmy M.、Ibrahim, Yehia A.、Girgis, Adel S.
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RIVETT D. E.; ROSEVEAR J.; WILSHIRE J. F. K., AUSTRAL. J. CHEM., 1979, 32, NO 7, 1601-1612