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
A CONVENIENT METHOD FOR THE SYNTHESES OF BENZYL<i>N</i>-ALKYLCYANOCARBAMATES AND<i>N</i>-MONOALKYLISOTHIOUREAS
作者:Takeo Taguchi、Yoshinari Sato、Teruaki Mukaiyama
DOI:10.1246/cl.1973.1225
日期:1973.11.5
A convenient method for the syntheses of benzyl N-alkylcyanocarbamates [III] and N-monoalkylisothioureas [V] have been established. Benzyl N-alkylcyanocarbamates [III] were obtained in high yields by the reactions of the potassium salt of benzyl cyanocarbamate with various alkyl halides. Further, it was found that N-alkyl-S-ethylisothioureas or N-alkyl-S-phenylisothioureas [V] were obtained in good