1: 72 percent / triethylamine / benzene / 3 h 2: NaOEt / ethanol / 20 h / Heating 3: H2O; acetonitrile / 2 h / Heating 4: 66 percent / triethylamine, toluene-p-sulphonyl azide / acetonitrile / 1.) 0 deg C, 1 h, 2.) RT, 2 h 5: 50 percent / H2O / diethyl ether / 0.75 h / Irradiation 6: 80 percent / toluene / 2 h / Heating 7: 85 percent / diborane-THF complex / 2 h / Heating View Scheme

1: 72 percent / triethylamine / benzene / 3 h 2: NaOEt / ethanol / 20 h / Heating 3: H2O; acetonitrile / 2 h / Heating 4: 66 percent / triethylamine, toluene-p-sulphonyl azide / acetonitrile / 1.) 0 deg C, 1 h, 2.) RT, 2 h View Scheme