1: 2-(1H-pyrrol-1-yl)ethanamine; formaldehyd With trifluoroacetic acid in ethanol; water T=25 - 50°C; 4.25 h; 2: With sodium hydrogencarbonate in water; ethyl acetate 3: di-tert-butyl dicarbonate With N-ethyl-N,N-diisopropylamine in dichloromethane T=0 - 25°C;

N-ethyl-N,N-diisopropylamine in dichloromethane T=25°C; 16 h; Product distribution / selectivity;

oxalyl dichloride; N,N-dimethyl-formamide in 1,2-dichloro-ethane T=0 - 25°C; 0.75 h; Product distribution / selectivity;

1: N,N-dimethyl-formamide With oxalyl dichloride in 1,2-dichloro-ethane T=20°C; Cooling with ice; 2: 3,4-Dihydro-1H-pyrrolo[1,2-a]pyrazine-2-carboxylic acid tert-butyl ester in 1,2-dichloro-ethane T=0°C; 0.5 h; 3: With water; sodium hydroxide in 1,2-dichloro-ethane Cooling with ice; Product distribution / selectivity;

oxalyl dichloride; N,N-dimethyl-formamide in 1,2-dichloro-ethane T=0 - 25°C; 0.75 h; Product distribution / selectivity;

1: N,N-dimethyl-formamide With oxalyl dichloride in 1,2-dichloro-ethane T=20°C; Cooling with ice; 2: 3,4-Dihydro-1H-pyrrolo[1,2-a]pyrazine-2-carboxylic acid tert-butyl ester in 1,2-dichloro-ethane T=0°C; 0.5 h; 3: With water; sodium hydroxide in 1,2-dichloro-ethane Cooling with ice; Product distribution / selectivity;