| Conţinutul numărului revistei |
| Articolul precedent |
| Articolul urmator |
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 SM ISO690:2012GEORGESCU, Emilian I., NICOLESCU, Alina Florica, GEORGESCU, Florentina, TEODORESCU, Florina Ruxandra, SHOVA, Sergiu, MARINOIU, Adriana, DUMITRASCU, Florea, DELEANU, Călin. Fine tuning the outcome of 1,3-dipolar cycloaddition reactions of benzimidazolium ylides to activated alkynes. In: Tetrahedron, 2016, nr. 19(72), pp. 2507-2520. ISSN 0040-4020. DOI: https://doi.org/10.1016/j.tet.2016.03.086 |
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  Tetrahedron |
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| Numărul 19(72) / 2016 / ISSN 0040-4020 /ISSNe 1464-5416 | |
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| DOI:https://doi.org/10.1016/j.tet.2016.03.086 | |
| Pag. 2507-2520 | |
| Rezumat | |
1,3-Dipolar cycloaddition reactions of benzimidazolium ylides, generated from 3-phenacylbenzimidazolium bromides, to non-symmetrical activated dipolarophiles in various reaction conditions led to complex mixtures of pyrrolo[1,2-a]benzimidazole and pyrrolo[1,2-a]quinoxaline derivatives. In order to explain all experimental results, the influence of reaction conditions on the reaction products was investigated. For the first time, 4-hydroxy-4,5-dihydropyrrolo[1,2-a]quinoxaline derivatives 6, pyrrolo[1,2-a]quinoxalinium quaternary salts 8, as well as 4-methoxy-4,5-dihydropyrrolo[1,2-a]quinoxalines 9, were separated, fully characterized and their interconversions are presented, together with a proposed reaction mechanism. |
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| Cuvinte-cheie cycloaddition, Nitrogen heterocycles, Pyrrolo[1,2-a]benzimidazole, Pyrrolo[1,2-a]quinoxaline, Ylides |
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