carbon tetrabromide; triphenylphosphine in tetrahydrofuran 12 h; Ambient temperature;

1: 1) 1,4-diazabicyclo<2.2.2>octane, 2) HCl / 1) (Ph3P)3RhCl / 1) EtOH, H2O, 60-70 deg C, 12 h, 2) reflux, 12 h 2: 87 percent / CBr4, PPh3 / tetrahydrofuran / 12 h / Ambient temperature View Scheme