1: 62 percent / triethylamine, trimethylsilyltriflate / CCl4 / 2 h / 0 °C 2: 1) cuprous iodide / 1) ether, 2) ether, 0 deg C, 1 h 3: 1) pyridine hydrobromide perbromide, 2) DBU / 1) AcOH, 6 h, RT, 2) THF, RT, 5 h View Scheme

1: 1) cuprous iodide / 1) ether, 2) ether, 0 deg C, 1 h 2: 1) pyridine hydrobromide perbromide, 2) DBU / 1) AcOH, 6 h, RT, 2) THF, RT, 5 h View Scheme

pyridinium hydrobromide perbromide; 1,8-diazabicyclo[5.4.0]undec-7-ene 1) AcOH, 6 h, RT, 2) THF, RT, 5 h; Yield given. Multistep reaction. Yields of byproduct given;