hydrogen; palladium/active carbon in methanol T=0 - 20°C; 1 h;

1: caesium carbonate; (1,1'-bis(diphenylphosphino)ferrocene)palladium(II) dichloride / N,N-dimethyl-formamide; water / 18 h / 100 °C / |Inert atmosphere 2: palladium 10 on activated carbon; ammonium formate / methanol / 2 h / |Inert atmosphere; |Reflux View Scheme

1: 3-Amino-4-ethyl benzoic acid With boron trifluoride diethyl etherate in tetrahydrofuran; chloroform T=-12°C; 0.333333 h; 2: tert.-butylnitrite in tetrahydrofuran; chloroform T=5°C; 1.5 h; 3: With potassium acetate; 18-crown-6 ether in tetrahydrofuran; chloroform T=20°C; 40 h;