N-ethyl-N,N-diisopropylamine in dichloromethane 3 h; Ambient temperature;

3-chloro-benzenecarboperoxoic acid in dichloromethane Heatingovernight;

1: lithium diisopropylamide / 1.) THF, ether, 1 h, 0 deg C 2.) -65 deg C, room temp. overnight, reflux in benzene, silica 2: m-chloroperbenzoic acid 3: benzene / Heating View Scheme