1: 98 percent / diphenyl phosphorazidate, Et3N / benzene / 1 h / 50 °C 2: 86.4 percent / 1,2-dichloro-benzene / 0.25 h / 190 °C 3: 41.5 percent / NaAlH2(OCH2CH2OCH3)2 / toluene / 20 h / Heating 4: 90.2 percent / NaNH2 / xylene / 1.5 h / 130 °C View Scheme

1: 98 percent / diphenyl phosphorazidate, Et3N / benzene / 1 h / 50 °C 2: 86.4 percent / 1,2-dichloro-benzene / 0.25 h / 190 °C 3: 41.5 percent / NaAlH2(OCH2CH2OCH3)2 / toluene / 20 h / Heating View Scheme