1: With pyridinium tribromide; potassium carbonate in dichloromethane T=20°C; Inert atmosphere; 2: With 1,8-diazabicyclo[5.4.0]undec-7-ene in dichloromethane T=0 - 60°C; 6 h; Inert atmosphere;

chloroform; bromine

2: chloroform; bromine View Scheme

(i) Br2, aq. NaOH, (ii) /BRN= 473192/, Py; Multistep reaction;