Preparation of 2-Aminopyridoimidazoles and 2-Aminobenzimidazoles via Phosphorus Oxychloride-Mediated Cyclization of Aminoureas
The Journal of Organic Chemistry2014Vol. 79(8), pp. 3688–3695
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Rebecca E. Deasy, Catherine N. Slattery, Anita R. Maguire, Douglas P. Kjell, Mai Khanh Hawk, Jung Min Joo, Rui Lin Gu, H.A. Moynihan
Abstract
The novel preparation of 2-aminopyridoimidazoles and 2-aminobenzimidazoles via the cyclization of (2-aminopyridin-3-yl)urea and (2-aminophenyl)urea substrates in the presence of phosphorus oxychloride is described. This methodology is demonstrated for a range of urea substrates with aminoimidazole products obtained in good yields and with excellent levels of purity.
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