Unusual formation of (
| Autor: | Khamid U, Khodjaniyazov, Utkir S, Makhmudov, Kambarali K, Turgunov, Burkhon Z, Elmuradov |
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| Rok vydání: | 2017 |
| Předmět: | |
| Zdroj: | Acta Crystallographica Section E: Crystallographic Communications |
| ISSN: | 2056-9890 |
| Popis: | Unusual formation of (E)-11-(aminomethylene)-8,9,10,11-tetrahydro-pyrido[2′,3′:4,5]pyrimido[1,2-a]azepin-5(7H)-one was found at formylation of 8,9,10,11-tetrahydropyrido[2′,3′:4,5]pyrimido[1,2-a]-azepin-5(7H)-one, which was explained by re-amination of firstly formed intermediate. Selective C-formylation of 8,9,10,11-tetrahydropyrido[2′,3′:4,5]pyrimido[1,2-a]-azepin-5(7H)-one has been studied for the first time. It was revealed that formylation proceeds by the formation of an intermediate salt, which due to the re-amination process on treatment with aqueous ammonia transformed into the corresponding (E)-11-(aminomethylene)-8,9,10,11-tetrahydropyrido[2′,3′:4,5]-pyrimido[1,2-a]azepin-5(7H)-one, C13H14N4O, as an E-isomer. Formylation was carried out by Vilsmeier–Haack reagent and the structure of the synthesized compound was confirmed by X-ray structural analysis, spectroscopic and LC–MS methods. In the molecule, the seven-membered pentamethylene ring adopts a twist-boat conformation. |
| Databáze: | OpenAIRE |
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