1: 88 percent / N-bromosuccinimide, triphenylphosphine / tetrahydrofuran / 2 h / Ambient temperature 2: 75 percent / 2 h / 140 °C 3: 1.) potassium tert-butoxide / 1.) THF-DMSO, 2.) r.t., occasional sonication, 50 min 4: 92 percent / hydrogen / 10 percent Pd-C / ethanol / 24 h / 2942.03 Torr / Ambient temperature 5: 1.) DMSO, oxalyl chloride, 2.) Et3N / 1.) CH2Cl2, -78 deg C, 15 min, 2.) -78 deg C, 5 min, then r.t., 20 min View Scheme

1H-imidazole; iodine; triphenylphosphine in tetrahydrofuran T=0 - 20°C; 1 h;

1: With 1H-imidazole; iodine; triphenylphosphine in acetonitrile T=0 - 20°C; Inert atmosphere; 2: With [iridium(III)(2-phenylpyridine)3]; N-ethyl-N,N-diisopropylamine in methanol; acetonitrile 0.3 h; Inert atmosphereIrradiationFlow reactor;

1: 88 percent / N-bromosuccinimide, triphenylphosphine / tetrahydrofuran / 2 h / Ambient temperature 2: 75 percent / 2 h / 140 °C 3: 1.) potassium tert-butoxide / 1.) THF-DMSO, 2.) r.t., occasional sonication, 50 min 4: 93 percent / hydrogen / 10 percent Pd-C / ethanol / 24 h / 2942.03 Torr / Ambient temperature 5: 1.) DMSO, oxalyl chloride, 2.) Et3N / 1.) CH2Cl2, -78 deg C, 15 min, 2.) -78 deg C, 5 min, then r.t., 20 min 6: 1.) lithium diisopropylamide, 2.) hexamethylphosphoric triamide / 1.) THF, -78 deg C, 2 h, 2.) -78 deg C, 1 h, then -15 deg C, 30 min 7: 86 percent / p-toluenesulfonic acid / benzene / 1 h / Heating 8: 89 percent / hydrogen / 10 percent Pd-C / acetone / 6 h / 2574.3 Torr / Ambient temperature View Scheme

1: 88 percent / N-bromosuccinimide, triphenylphosphine / tetrahydrofuran / 2 h / Ambient temperature 2: 75 percent / 2 h / 140 °C 3: 1.) potassium tert-butoxide / 1.) THF-DMSO, 2.) r.t., occasional sonication, 50 min 4: 85 percent / hydrogen / 10 percent Pd-C / ethanol / 24 h / 2942.03 Torr / Ambient temperature 5: 1.) DMSO, oxalyl chloride, 2.) Et3N / 1.) CH2Cl2, -78 deg C, 15 min, 2.) -78 deg C, 5 min, then r.t., 20 min 6: 1.) lithium diisopropylamide, 2.) hexamethylphosphoric triamide / 1.) THF, -78 deg C, 2 h, 2.) -78 deg C, 1 h, then -15 deg C, 30 min 7: 88 percent / p-toluenesulfonic acid / benzene / 1 h / Heating 8: 88 percent / hydrogen / 10 percent Pd-C / acetone / 6 h / 2574.3 Torr / Ambient temperature 9: 96 percent / boron tribromide / CH2Cl2 / 0.33 h / Ambient temperature View Scheme

1: 88 percent / N-bromosuccinimide, triphenylphosphine / tetrahydrofuran / 2 h / Ambient temperature 2: 75 percent / 2 h / 140 °C 3: 1.) potassium tert-butoxide / 1.) THF-DMSO, 2.) r.t., occasional sonication, 50 min 4: 83 percent / hydrogen / 10 percent Pd-C / ethanol / 24 h / 2942.03 Torr / Ambient temperature 5: 1.) DMSO, oxalyl chloride, 2.) Et3N / 1.) CH2Cl2, -78 deg C, 15 min, 2.) -78 deg C, 5 min, then r.t., 20 min 6: 1.) lithium diisopropylamide, 2.) hexamethylphosphoric triamide / 1.) THF, -78 deg C, 2 h, 2.) -78 deg C, 1 h, then -15 deg C, 30 min 7: 91 percent / p-toluenesulfonic acid / benzene / 1 h / Heating 8: 88 percent / hydrogen / 10 percent Pd-C / acetone / 6 h / 2574.3 Torr / Ambient temperature 9: 97 percent / boron tribromide / CH2Cl2 / 0.17 h / Ambient temperature View Scheme