triethylamine in N,N-dimethyl-formamide 1 h;

1: 94 percent / formic acid, H2 / Pd/C / methanol / 1 h 2: 60 percent / triethylamine / dimethylformamide / 1 h View Scheme

1: N-methylmorpholine / CH2Cl2 / 0.33 h / -5 °C 2: N-methylmorpholine / CH2Cl2 / 2.5 h / 0 - 20 °C 3: 94 percent / formic acid, H2 / Pd/C / methanol / 1 h 4: 60 percent / triethylamine / dimethylformamide / 1 h View Scheme