1: 1) NaBH4 / 1) ethanol, room temperature, 2) ethanol, room temperature 2: diethyl ether / 1) -78 deg C, 20 min, 2) 0 deg C, 10 min 3: m-CPBA, KH2PO4 / methanol / Ambient temperature View Scheme

1: diethyl ether / 1) -78 deg C, 20 min, 2) 0 deg C, 10 min 2: m-CPBA, KH2PO4 / methanol / Ambient temperature View Scheme

1: 1) NaBH4 / 1) ethanol, room temperature, 2) ethanol, room temperature 2: diethyl ether / 1) -78 deg C, 20 min, 2) 0 deg C, 10 min 3: m-CPBA, KH2PO4 / methanol / Ambient temperature View Scheme

sodium hydroxide 1) room temperature, 2) 45 deg C, 3 h; Yield given. Yields of byproduct given. Title compound not separated from byproducts;