1: 55.8 percent / tri-n-butyltin hydride, azobisisobutyronitrile / benzene / 60 - 65 °C 2: 84 percent / 1 M tetra-n-butylammonium fluoride / tetrahydrofuran 3: 66 percent / H2 / 10percent Pd/C / methanol / 6 h / 1551.4 Torr 4: 96 percent / ammonia / methanol / 12 h / 50 - 55 °C / in a pressure vessel View Scheme

1: 55.8 percent / tri-n-butyltin hydride, azobisisobutyronitrile / benzene / 60 - 65 °C 2: 84 percent / 1 M tetra-n-butylammonium fluoride / tetrahydrofuran 3: 81 percent / ammonia / methanol / 12 h / 50 - 55 °C / in a pressure vessel View Scheme

With  2,2'-azo-bisisobutyronitrile; tri-n-butyl-tin hydride in  benzene T=60 - 65°C;   

Multi-step reaction with 2 steps 1: 55.8 percent / tri-n-butyltin hydride, azobisisobutyronitrile / benzene / 60 - 65 °C2: 84 percent / 1 M tetra-n-butylammonium fluoride / tetrahydrofuran