反应条件
1.1: toluene-4-sulfonic acid / benzene / Reflux 1.2: 3 h 2.1: triethylamine / dichloromethane / 2.5 h / 0 - 25 °C 3.1: 4-(N,N-dimethlyamino)pyridine / toluene / 0.08 h / 0 - 10 °C 3.2: 18 h / 25 °C 4.1: sulfuric acid / water; tetrahydrofuran / 23.5 h / 0 - 30 °C View Scheme
