1: 2-amino-4-lt;(cyclohexylmethyl)aminogt;pyrimidin-6-one With sodium acetate in water; N,N-dimethyl-formamide 0.166667 h; Inert atmosphere; 2: ethyl alpha-chloroacetoacetate in water; N,N-dimethyl-formamide 126 h; Inert atmosphere;