1: ortho-nitrobenzoic acid With 4-methyl-morpholine; 4-(4,6-Dimethoxy-1,3,5-triazin-2-yl)-4-methylmorpholin-4-ium chloride in tetrahydrofuran T=20°C; 1.5 h; 2: O,N-dimethyl-hydroxylamine hydrochloride in tetrahydrofuran T=20°C; 8 h; Further stages.;

pyridine in dichloromethane T=0 - 20°C;