1: 98 percent / aq. NaOH / 1.)room temp., 20 min; 2.) 100 deg C, 2 h. 2: 98 percent / POCl3 / 1 h / Heating View Scheme

Multi-step reaction with 3 steps 1: 96 percent / K2CO3 / dimethylformamide / 4.5 h / 100 °C2: 99 percent / 1.0 N aq. NaOH / ethanol / 1.) 100 deg C, 1 h; 2.) room temp., 18 h.3: 90 percent / thionyl chloride / 1.) room temp., 20 min.; 2.) 60 deg C, 6 h.  

Multi-step reaction with 2 steps 1: 99 percent / 1.0 N aq. NaOH / ethanol / 1.) 100 deg C, 1 h; 2.) room temp., 18 h.2: 90 percent / thionyl chloride / 1.) room temp., 20 min.; 2.) 60 deg C, 6 h.  

Multi-step reaction with 4 steps 1: 80 percent / various solvent(s) / Heating2: 96 percent / K2CO3 / dimethylformamide / 4.5 h / 100 °C3: 99 percent / 1.0 N aq. NaOH / ethanol / 1.) 100 deg C, 1 h; 2.) room temp., 18 h.4: 90 percent / thionyl chloride / 1.) room temp., 20 min.; 2.) 60 deg C, 6 h.