triethylamine in tetrahydrofuran; water 24 h; Ambient temperature;

1: 1.) NaOEt / 1.) ethanol, 2.) ethanol, 5 h, reflux 2: 1.) aq. NaOH, 2.) acetic acid, 3.) 12 M aq. HCl 3: 64 percent / Et3N / tetrahydrofuran; H2O / 24 h / Ambient temperature View Scheme