1: 86 percent / dimethylformamide / 1 h / Heating 2: 94 percent / H2 / 10percent Pd/C / ethanol / Ambient temperature 3: NaNO2 / 1.) aq. H2SO4, 0-3 grad C then roomtemp. 30 min; 2.) 90 grad C, 30 min 4: 88 percent / K2CO3 / butan-2-one / 48 h / Heating View Scheme