triethylamine in tetrahydrofuran 1 h;

1: 80 percent / Et3N / tetrahydrofuran / 1 h 2: 72 percent / SOCl2 / CHCl3 / 1.) room temp., 30 min, 2.) 40 deg C, 5 min 3: 38 percent / Et3N / tetrahydrofuran / 1 h View Scheme

1: 72 percent / SOCl2 / CHCl3 / 1.) room temp., 30 min, 2.) 40 deg C, 5 min 2: 38 percent / Et3N / tetrahydrofuran / 1 h View Scheme