1: 94 percent / thionyl chloride, acetyl chloride / 4 h / Ambient temperature 2: 79 percent / triethylamine / 1 h / Ambient temperature 3: 95 percent / 1 M HCl / tetrahydrofuran / 0.5 h / Ambient temperature View Scheme

1: 94 percent / thionyl chloride, acetyl chloride / 4 h / Ambient temperature 2: 95 percent / 5percent NaOH / tetrahydrofuran / 0.5 h / Ambient temperature View Scheme

1: 94 percent / thionyl chloride, acetyl chloride / 4 h / Ambient temperature 2: 90 percent / tetrahydrofuran / Ambient temperature 3: 90 percent / water, triethylamine / tetrahydrofuran / 0.67 h / Ambient temperature View Scheme

1: 94 percent / thionyl chloride, acetyl chloride / 4 h / Ambient temperature 2: 90 percent / tetrahydrofuran / Ambient temperature View Scheme