pyridine; hydroxylamine hydrochloride in 1,2-dichloro-ethane; N,N-dimethyl-formamide 10 h; Heating;

1: sodium hydride / tetrahydrofuran / 0.25 h / -30 °C 2: diethyl ether View Scheme

chlorosulphonyl isocyanate in acetonitrile Ambient temperature;

1: N,N-dimethylpyrrole-2-formiminium chloride; 2,2,2-trichloroacetyl chloride With AlCl3, aluminium chloride in 1,2-dichloro-ethane 4 h; RefluxInert atmosphere; 2: methanol With sodium methylate in 1,2-dichloro-ethane T=20°C; 2 h; Inert atmosphere;