反应条件
1: 1.) pyridine, (CF3CO)2O, 2.) NaN3 / 1.) CH2Cl2, -15 deg C, 15 min; 2.) CH2Cl2, DMF, room temperature, 5 h 2: 75 percent / p-TsOH / methanol; CH2Cl2 / 12 h / Ambient temperature 3: 95 percent / H2S / pyridine; H2O / 48 h / Ambient temperature View Scheme
