sodium tetrahydroborate in methanol Heating; Yield given;

1: p-TsOH / toluene / Heating 2: NaBH4 / methanol / Heating View Scheme

1: 72 percent / CH2Cl2 / 48 h / Ambient temperature 2: 1.) Bu3SnH, AIBN; 2.) NaBH4 / 1.) cyclohexane, 2.5 h, reflux; 2.) DMF/cyclohexane, r.t., 60 min View Scheme