反应条件
1: 84 percent / AgOCOCF3 / Ambient temperature 2: 79 percent / CSA / toluene 3: 73 percent / LiOH, H2O / methanol / Ambient temperature 4: 95 percent Turnov. / di(2-pyridyl)thionocarbonate, DMAP / toluene / 73 °C 5: 100 percent / TFA, H2O / 0 °C View Scheme