1: 94 percent / Et3N / diethyl ether / 0 - 20 °C 2: 64 percent / oxalyl chloride; Me3SiOTf / CH2Cl2 / 14 h / -78 - 20 °C 3: 66 percent / K2CO3 / acetone / 20 °C 4: NaOMe / methanol View Scheme

methanol; palladium Hydrogenation;