4H-Chromenes as 1,3-bielectrophiles in the reaction with 2-aminobenzimidazole: synthesis of pyrimido[1,2-a]benzimidazoles
Autor: | Kirill S. Korzhenko, Vitaly А. Osyanin, Dmitry V. Osipov, Yuri N. Klimochkin, Oleg P. Demidov |
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Rok vydání: | 2021 |
Předmět: | |
Zdroj: | Chemistry of Heterocyclic Compounds. 57:588-593 |
ISSN: | 1573-8353 0009-3122 |
DOI: | 10.1007/s10593-021-02947-x |
Popis: | A method for the preparation of pyrimido[1,2-a]benzimidazoles containing a 2-hydroxybenzyl or (2-hydroxynaphthalen-1-yl)methyl group at position 3 was proposed based on the reaction of β-carbonyl-substituted 4H-chromenes and their benzo analogs with 2-aminobenzimidazole. In the case of chromenes substituted in the methylene fragment, 7,13a-dihydro-5H-benzo[5',6']chromeno-[3',2':5,6]pyrimido[1,2-a]benzimidazoles were isolated. |
Databáze: | OpenAIRE |
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