triethylamine in tetrahydrofuran 24 h; Heating;

1: 80 percent / 25percent aq. NaOH, K2CO3 / 1.)90-100 deg C, 6 h 2.)25-30 deg C, 18 h 2: 72 percent / SOCl2 / benzene / 3 h / Heating 3: 72 percent / Et3N / tetrahydrofuran / 24 h / Heating View Scheme

1: 72 percent / SOCl2 / benzene / 3 h / Heating 2: 72 percent / Et3N / tetrahydrofuran / 24 h / Heating View Scheme