sodium carbonate; 3-chloro-benzenecarboperoxoic acid in hexane 1) 6h, room temperature 2) 1h, reflux;

1: 16 percent / m-chloroperoxybenzoic acid, anhydrous Na2CO3 / hexane / 1) 6h, room temperature 2) 1h, reflux 2: 1) n-BuLi / 1) THF, 15 min, -78 deg C 2) -> room temperature 3: dimethylformamide / 5 h / steam bath 4: 41 percent / 1.0M NaOH / methanol / 3 h / Heating View Scheme