boron trifluoride diethyl etherate in nitromethane 0.416667 h; Ambient temperature;

Multi-step reaction with 6 steps 1: 94 percent / DBU / 7 h / 0 - 25 °C2: 80 percent / BF3*Et2O / 0.5 h / -75 °C3: toluene / 110 °C / sealed tube4: p-TsOH*H2O / methanol / 16 h5: 1.) (COCl)2, DMSO, 2.) Et3N / 1.) -40 deg C, 15 min.6: 15 h / Ambient temperature  

Multi-step reaction with 4 steps 1: toluene / 110 °C / sealed tube2: p-TsOH*H2O / methanol / 16 h3: 1.) (COCl)2, DMSO, 2.) Et3N / 1.) -40 deg C, 15 min.4: 15 h / Ambient temperature  

Multi-step reaction with 5 steps 1: 80 percent / BF3*Et2O / 0.5 h / -75 °C2: toluene / 110 °C / sealed tube3: p-TsOH*H2O / methanol / 16 h4: 1.) (COCl)2, DMSO, 2.) Et3N / 1.) -40 deg C, 15 min.5: 15 h / Ambient temperature  

Multi-step reaction with 3 steps 1: p-TsOH*H2O / methanol / 16 h2: 1.) (COCl)2, DMSO, 2.) Et3N / 1.) -40 deg C, 15 min.3: 15 h / Ambient temperature  

Multi-step reaction with 2 steps 1: 1.) (COCl)2, DMSO, 2.) Et3N / 1.) -40 deg C, 15 min.2: 15 h / Ambient temperature