(i) N-chloro-succinimide, THF, MeCN, (ii) H2O; Multistep reaction;

N,N,N',N',N'',N''-hexamethylphosphoric triamide; n-butyllithium 1.) a) THF from -78 deg C to -40 deg C, 2 h, b) -40 deg C, 0.5 h, 2.) a) -78 deg C, 15 min, b) 0 deg C, 1 h; Yield given. Multistep reaction;