反应条件
1: sulfuric acid / 2 h / Reflux 2: 4-(N,N-dimethlyamino)pyridine / dichloromethane / 1 h / 20 °C 3: hydrogen / platinum(IV) oxide / ethanol / 1 h / 20 °C / 2585.81 Torr / Inert atmosphere 4: trifluoroacetic acid / dichloromethane / 2 h / 20 °C View Scheme
