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Oxidative aromatization of some 1,4-dihydropyridines by aqueous hydrogen peroxide in ethanol | ||
| Iranian chemical communication | ||
| مقاله 10، دوره 3، Issue 2, pp. 72-147, Serial No. 7، تیر 2015، صفحه 143-147 اصل مقاله (436.88 K) | ||
| نوع مقاله: Original Research Article | ||
| نویسندگان | ||
| Masoomeh Abdoli* 1؛ Maryam Hajibabaiee2 | ||
| 1Azad university of arak | ||
| 2Islamic Azad University-Arak Branch. Arak, Iran | ||
| چکیده | ||
| Some 3, 5-diacyl or 3,5-diester 1,4-dihydropyridines were oxidized to the corresponding pyridine derivatives using hydrogen peroxide in aqueous ethanol in the presence of potassium bromide and acetic acid as the catalysts. The reaction was carried out in ethanol and products were isolated in high to excellent yields. However, oxidation of 3,5-diacetyl 1,4-dihydropyridines is slower than 3,5-diester 1,4-dihydropyridines under the same condition. Furhermore, the reaction is facilitated by electron releasing groups on 4-substituent of dihydropyridine ring. The cheapness of reagent, high yielding, easy workup and mild condition makes this method a useful addition to the available method in organic synthesis. In addition, employment of clean oxidant H2O2 together with nontoxic solvent ethanol makes it friendly to the environment. | ||
| کلیدواژهها | ||
| 3؛ 5-Diester 1؛ 4-dihydropyridines؛ 5-diacetyl 1؛ 4-dihydropyridine | ||
| مراجع | ||
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