triethylamine in N,N-dimethyl-formamide 3 h;

1: H2 / Pd/C / methanol / 3 h 2: 55 percent / triethylamine / dimethylformamide / 3 h View Scheme

1: N-methylmorpholine / CH2Cl2 / 0.33 h / -5 °C 2: N-methylmorpholine / CH2Cl2 / 2.5 h / 0 - 20 °C 3: H2 / Pd/C / methanol / 3 h 4: 55 percent / triethylamine / dimethylformamide / 3 h View Scheme