N-bromosuccinmide; dibenzoyl peroxide in tetrachloromethane 1.) 15 min, room temp., 2.) reflux, 3 h, hν;

1: 87 percent / pyridine / diethyl ether / 3 h / Heating 2: 84 percent / NBS, dibenzoyl peroxide / CCl4 / 1.) 15 min, room temp., 2.) reflux, 3 h, hν View Scheme