A simple regioselective synthesis of pyrimido [1, 2??a] benzimidazoles

SS Tseng, JW Epstein, HJ Brabander…

Index: Tseng, Shin-Shyong; Epstein, Joseph W.; Brabander, Herbert J.; Francisco, Gerardo Journal of Heterocyclic Chemistry, 1987 , vol. 24, p. 837 - 843

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Citation Number: 40

Abstract

Abstract 2-Aminobenzimidazoles were reacted with enaminones in acetic acid to give pyrimido [1, 2-a] benzimidazoles. With a substituted enaminone only one regioisomer was obtained. Structural assignments based on nmr and uv spectroscopy are presented. Possible pathways leading to the products are discussed.