pyridine; trifluoromethylsulfonic anhydride 1.) CH2Cl2, -40 to 0 deg C, 2 h; 0 deg C, 10 h, 2.) r.t., 12 h; Yield given. Multistep reaction;

N-bromosuccinmide in chloroform T=20°C; 20 h; Product distribution;