Metal-Free Oxidation of Urazole and 1,4-Dihydropyridine Derivatives Under Mild and Heterogeneous Conditions by Nitro Urea, Derived from Urea Nitrate, and Silica Sulfuric Acid

Arash      Ghorbani-Choghamarani; Mohammad      A. Zolfigol; Maryam      Hajjami; Shahrbanoo      Rastgoo; Shadpour      Mallakpour

Letters in Organic Chemistry

Author(s): Arash Ghorbani-Choghamarani, Mohammad A. Zolfigol, Maryam Hajjami, Shahrbanoo Rastgoo and Shadpour Mallakpour

DOI: 10.2174/157017810791112450

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Metal-Free Oxidation of Urazole and 1,4-Dihydropyridine Derivatives Under Mild and Heterogeneous Conditions by Nitro Urea, Derived from Urea Nitrate, and Silica Sulfuric Acid

Page: [249 - 254] Pages: 6

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Abstract

Mild combination of nitro urea, derived from urea nitrate, and silica sulfuric acid (SiO2OSO3H) might act as an efficient oxidizing media, which could be able to oxidize different types of heterocyclic compounds including urazoles and 1,4-dihydropyridines. The process presented here is operationally simple, environmentally benign, and reactions have been mildly carried out in dichloromethane at room temperature.

Keywords: Urazole, 1,4-dihydropyridine, urea nitrate, nitro urea, silica sulfuric acid

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