1: 80 percent / POCl3, ZnCl2 / 10 h / Ambient temperature 2: 72 percent / K2CO3, KI / dimethylformamide / 18 h / 80 °C 3: NaBH4 / methanol / 1 h / Ambient temperature 4: 4M HCl / tetrahydrofuran / 2.5 h View Scheme

1: 72 percent / K2CO3, KI / dimethylformamide / 18 h / 80 °C 2: NaBH4 / methanol / 1 h / Ambient temperature 3: 4M HCl / tetrahydrofuran / 2.5 h View Scheme

1: NaBH4 / methanol / 1 h / Ambient temperature 2: 4M HCl / tetrahydrofuran / 2.5 h View Scheme

1: 70 percent / conc. sulfuric acid, 99.5percent acetic acid / 25 °C 2: 80 percent / POCl3, ZnCl2 / 10 h / Ambient temperature 3: 72 percent / K2CO3, KI / dimethylformamide / 18 h / 80 °C 4: NaBH4 / methanol / 1 h / Ambient temperature 5: 4M HCl / tetrahydrofuran / 2.5 h View Scheme