1: 1) HCOONa, NDDH, SDH, FDH, 2) DMAP / 1) H2O, r.t, 4 d, 2) pyridine, 18 h, r.t. 2: 83 percent / chloroperbenzoic acid / CH2Cl2 / 1 h / -5 °C 3: 52 percent / AcONa / 6 h / Heating 4: DIBAL-H / CH2Cl2; hexane / 1 h / -78 °C View Scheme