1: 60 percent / triphenylphosphine, diethyl azodicarboxylate / tetrahydrofuran 2: NaBH4 / methanol / 1 h / -4 °C 3: methanesulfonyl chloride, triethylamine / CH2Cl2 / -20 deg C to r.t. View Scheme

1: 60 percent / triphenylphosphine, diethyl azodicarboxylate / tetrahydrofuran 2: NaBH4 / methanol / 1 h / -4 °C 3: methanesulfonyl chloride, triethylamine / CH2Cl2 / -20 deg C to r.t. View Scheme

1: NaBH4 / methanol / 1 h / -4 °C 2: methanesulfonyl chloride, triethylamine / CH2Cl2 / -20 deg C to r.t. View Scheme