[CH2:1]([NH2:8])[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.Cl[C:10]([O:12][C:13]1[CH:18]=[CH:17][CH:16]=[CH:15][CH:14]=1)=[O:11].C(=O)([O-])[O-].[K+].[K+].O>O1CCOCC1>[CH2:1]([NH:8][C:10](=[O:11])[O:12][C:13]1[CH:18]=[CH:17][CH:16]=[CH:15][CH:14]=1)[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1Benzylamine (53.5 g.) is added during 30 minutes to a stirred suspension of phenyl chloroformate (78.3 g.) and anhydrous potassium carbonate (151.8 g.) in dioxan (500 ml.) and the mixture is stirred at laboratory temperature for 72 hours and then poured into water. The mixture is extracted with ethyl acetate and the extract is washed with water, dried over magnesium sulphate and evaporated to dryness. The residue is stirred with petroleum ether (b.p. 60°-80° C.) and the mixture is filtered. There is thus obtained as solid residue phenyl N-benzylcarbamate, which is used without further purification.
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