in pyridine 2 h; Heating;

1: 68 percent / pyridine / 2 h / Heating 2: 1.) NaNO2, 40 percent H2SO4, 2.) CuSO4*5H2O, NaCl / 1.) water, 30 min, -10 deg C, 2.) water, 40 min, r.t. 3: 96 percent / H2, triethylamine / 10 percent Pd-C / ethanol / 760 Torr View Scheme