1: 1.) Et3N, MeSO2Cl, 2.) NaOH / 1.) CH2Cl2, 0 deg C, 20 min, 2.) MeOH, 5 min 2: 93 percent / NaH / tetrahydrofuran / 15 h / Ambient temperature View Scheme

sodium hydroxide; methanesulfonyl chloride; triethylamine 1.) CH2Cl2, 0 deg C, 20 min, 2.) MeOH, 5 min; Yield given. Multistep reaction;