1: 1.) 3-chloroperbenzoic acid, 2.) HCl / 1.) CHCl3, 10 d, 2.) aq. EtOH, reflux, 3.5 h 2: 50 percent / K2CO3 / acetone / 3 h / Heating 3: 1.) NH4Cl, Zn, 2.) NaHCO3 / 1.) DMF, 0 deg C, 1 h, 2.) Et2O, 0 deg C, 1 h View Scheme

1: 50 percent / K2CO3 / acetone / 3 h / Heating 2: 1.) NH4Cl, Zn, 2.) NaHCO3 / 1.) DMF, 0 deg C, 1 h, 2.) Et2O, 0 deg C, 1 h View Scheme

sodium hydrogencarbonate; ammonium chloride; zinc 1.) DMF, 0 deg C, 1 h, 2.) Et2O, 0 deg C, 1 h; Yield given. Multistep reaction;