1.1: Noyori catalyst (S,S) / CH2Cl2; propan-2-ol / 96 h / 20 °C 2.1: 95 percent / DMAP / CH2Cl2 / 0.17 h / 20 °C 3.1: Hg(O2CCF3)2 / tetrahydrofuran; acetonitrile; H2O / 0.08 h / 20 °C 3.2: DBU; NaBH4 / tetrahydrofuran; H2O View Scheme