acetic acid in tetrahydrofuran 24 h; Ambient temperature;

1: 75 percent / diethylazodicarboxylate, triphenylphosphine / tetrahydrofuran / 24 h / Ambient temperature 2: 88 percent / molibdenumhexacarbonyl / acetonitrile; H2O / 1.5 h / Heating 3: 90 percent / 75 percent acetic acid / tetrahydrofuran / 24 h / Ambient temperature View Scheme

1: 1.) triethylamine, phenylisocyanate; 2.) citric acid / 1.) benzene, r.t.; 2.) methanol, 12 h 2: 2.90 g / 5 percent HCl / methanol / 1 h / Ambient temperature 3: 75 percent / diethylazodicarboxylate, triphenylphosphine / tetrahydrofuran / 24 h / Ambient temperature 4: 88 percent / molibdenumhexacarbonyl / acetonitrile; H2O / 1.5 h / Heating 5: 90 percent / 75 percent acetic acid / tetrahydrofuran / 24 h / Ambient temperature View Scheme

1: 75 percent / diethylazodicarboxylate, triphenylphosphine / tetrahydrofuran / 24 h / Ambient temperature 2: 88 percent / molibdenumhexacarbonyl / acetonitrile; H2O / 1.5 h / Heating 3: 90 percent / 75 percent acetic acid / tetrahydrofuran / 24 h / Ambient temperature View Scheme