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Paper | Regular issue | Vol 32, No. 10, 1991, pp.1923-1931
Published online, 1st January, 1970
DOI: 10.3987/COM-91-5805
Synthesis and Application of Imidazole Derivatives. Synthesis of Pyrido[1,2-a]benzimidazolone Derivatives

Shunsaku Ohta,* Teruyuki Yuasa, Yoshihiro Narita, Ikuo Kawasaki, Eiji Minamii, and Masayuki Yamashita

*Kyoto Pharmaceutical University, Misasagi, Yamashina-ku, Kyoto 607-8412, Japan

Abstract

Pyrido[1,2-a]benzimidazole derivatives (12a and 19a) were synthesized in moderate yields via an intramolecular aldol-condensation of 2-acetyl-1-formylmethylbenzimidazole (11) and an intramolecular acylation of the acylimidzolide (18) prepared from 2-ethoxycarbonylmethyl-1-(2-carboxyethyl)benzimidazole (17), respectively.