1: 80 percent / acetonitrile / Ambient temperature 2: 1) AIBN, n-Bu3SnH, 2) aq.AcOH / 1) toluene, 110-120 deg C, 3.5 h, 2) 50 deg C, 30 min View Scheme

1: 80 percent / acetonitrile / Ambient temperature 2: 60 percent / 1,3-dimethyl-2-phenyl-1,3,2-diazaphospholidine / tetrahydrofuran / 24 h / Ambient temperature 3: 69 percent / silica gel / benzene / 96 h / Ambient temperature View Scheme