1: 96 percent / SnCl4 / CH2Cl2 / Heating 2: 84 percent / AgOCOCF3 / Ambient temperature 3: 79 percent / CSA / toluene 4: 73 percent / LiOH, H2O / methanol / Ambient temperature 5: 95 percent Turnov. / di(2-pyridyl)thionocarbonate, DMAP / toluene / 73 °C 6: 100 percent / TFA, H2O / 0 °C View Scheme

1: 96 percent / SnCl4 / CH2Cl2 / Heating 2: 84 percent / AgOCOCF3 / Ambient temperature View Scheme

1: 96 percent / SnCl4 / CH2Cl2 / Heating 2: 84 percent / AgOCOCF3 / Ambient temperature 3: 89 percent / PPTS / toluene / 85 °C 4: 86 percent / LiOH, H2O / methanol / Ambient temperature View Scheme

1: 78 percent / AgNO3, H2O / dioxane / Heating 2: di(2-pyridyl)thionocarbonate, DMAP / toluene / 73 °C 3: 76 percent / H2 / Pd(OH)2/C / ethanol / Ambient temperature View Scheme