ammonium hydroxide in pyridine T=25°C; 0.25 h; Yield given;

1: aq. ammonium hydroxide / methanol 2: 99 percent / pyridine; DMAP 3: 84 percent / H2O / acetonitrile / 9.5 h / 0 - 20 °C 4: 92 percent / tri-n-butyltin hydride; 2,2'-azobisisobutyronitrile / toluene / 0.83 h / 95 °C 5: 100 percent / tetra-n-butylammonium fluoride / tetrahydrofuran / 0 °C 6: 100 percent / aq. ammonia / methanol View Scheme

With  pyridine T=25°C; 2 h;