Abstract
Abstract It was established that N-protected 2(1H)-imidazolone derivatives are conveniently prepared by the reaction of benzyl N-potassium-N-cyanocarbamate [Ia] or ethyl N-potassium-N-cyanocarbamate [Ib] with α-halo carbonyl compounds. N-Protecting group, benzyloxycarbonyl or ethoxycarbonyl group, was easily removed either by hydrogenation on Pd–C or alkaline hydrolysis to afford 2(1H)-imidazolone in good yields.
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