1: Et3N, DMAP / CH2Cl2 / 9 h / Ambient temperature 2: 74 percent / NaBH4, MeOH / ethanol / 24 h / Ambient temperature 3: 100 percent / SOCl2 / tetrahydrofuran / 3 h / 0 °C View Scheme

1: Et3N, DMAP / CH2Cl2 / 9 h / Ambient temperature 2: 74 percent / NaBH4, MeOH / ethanol / 24 h / Ambient temperature View Scheme

1: Et3N, DMAP / CH2Cl2 / 9 h / Ambient temperature 2: KMnO4, KOH / 2-methyl-propan-2-ol; H2O / Ambient temperature View Scheme