1: 1.) sodium formaldehyde sulfoxylate, NaOH / 1.) EtOH, H2O, 50 deg C, 15 min, 2.) 0 deg C, 3 h 2: 1.) LDA, 3.) HMPA View Scheme

N,N,N',N',N'',N''-hexamethylphosphoric triamide; lithium diisopropyl amide Yield given. Multistep reaction;

pyridine; 3-chloro-benzenecarboperoxoic acid 1.) CH2Cl2, -78 deg C, 0.5 h, 2.) 0.5 h; Multistep reaction. Title compound not separated from byproducts;

iodine; tetra-(n-butyl)ammonium iodide; 3-chloro-benzenecarboperoxoic acid in dichloromethane 1.) -78 deg C -> - 30 deg C, 15 min, 2.) -30 deg C - -20 deg C, 0.5 h; Title compound not separated from byproducts;

1: 1.) m-chloroperbenzoic acid, 2.) pyridine / 1.) CH2Cl2, -78 deg C, 0.5 h, 2.) 0.5 h 2: 1.) m-CPBA, 2.) NEt3 / 1.) THF, -78 deg C, 0.5 h, 2.) -78 deg C -> 0 deg C, 30 min View Scheme