1: 1) 2,2'-bipyridyl, BuLi / 1) THF, hexane, 2) 1 h 2: 78 percent / Ca(OH)2 / aq. ethanol / 36 h / Ambient temperature 3: 67 percent / POCl3, DMF / CHCl3 / 24 h View Scheme

1: 78 percent / Ca(OH)2 / aq. ethanol / 36 h / Ambient temperature 2: 67 percent / POCl3, DMF / CHCl3 / 24 h View Scheme

ammonium hydroxide in N,N-dimethyl-formamide 36 h; Ambient temperature;

ammonium hydroxide in N,N-dimethyl-formamide 12 h; Heating;