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
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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