oxygen; cyclohexyl(iPr)NLi in dimethyl sulfoxide 16 h; Ambient temperature;

formic acid; triethylamine; (1R,2R)-N-(p-toluenesulfonyl)-1,2-diphenylethylenediamine; [Ru2(p-PriC6H4Me)2(μ-Cl)Cl]2 in dichloromethane T=30°C; 13 h;

Rhodium trichloride; sodium carbonate; triphenylphosphine T=100°C; 132 h;