1: 87 percent / tri-n-butyltin hydride, azobisisobutyronitrile / toluene / Heating 2: 67 percent / 1 M tetra-n-butylammonium fluoride / tetrahydrofuran View Scheme

With  2,2'-azo-bisisobutyronitrile; tri-n-butyl-tin hydride in  toluene  Heating;