oxygen; rose bengal in acetonitrile T=13°C; Irradiation;

1: 69 percent / Br2 / CHCl3; CCl4 / 1) 5 deg C, 20 min, 2) 5 deg C -> 40 deg C, 2 h 2: 95 percent / K2CO3 / dimethylformamide / 2 h / 25 °C 3: 1) K2CO3, 2) 1 M NaOH / 1) DMSO, 25 deg C, 10 min, 2) DMSO, H2O, 25 deg C, 1 h 4: 78 percent / NaBH4 / ethanol / 3 h / 5 - 25 °C 5: 30 percent Chromat. / O2, Rose Bengal / acetonitrile / 13 °C / Irradiation 6: 96 percent / K2CO3 / dimethylformamide / 2 h / 25 °C 7: 52 percent / CuBr2 / ethyl acetate 8: 92 percent / K2CO3 / dimethylformamide / 2 h / 25 °C 9: 90 percent / K2CO3 / dimethylsulfoxide / 0.17 h / 25 °C 10: O2, Rose Bengal / acetonitrile / 13 °C / Irradiation View Scheme

1: 30 percent Chromat. / O2, Rose Bengal / acetonitrile / 13 °C / Irradiation 2: 96 percent / K2CO3 / dimethylformamide / 2 h / 25 °C 3: 52 percent / CuBr2 / ethyl acetate 4: 92 percent / K2CO3 / dimethylformamide / 2 h / 25 °C 5: 90 percent / K2CO3 / dimethylsulfoxide / 0.17 h / 25 °C 6: O2, Rose Bengal / acetonitrile / 13 °C / Irradiation View Scheme

1: 78 percent / NaBH4 / ethanol / 3 h / 5 - 25 °C 2: 30 percent Chromat. / O2, Rose Bengal / acetonitrile / 13 °C / Irradiation 3: 96 percent / K2CO3 / dimethylformamide / 2 h / 25 °C 4: 52 percent / CuBr2 / ethyl acetate 5: 92 percent / K2CO3 / dimethylformamide / 2 h / 25 °C 6: 90 percent / K2CO3 / dimethylsulfoxide / 0.17 h / 25 °C 7: O2, Rose Bengal / acetonitrile / 13 °C / Irradiation View Scheme

1: 95 percent / K2CO3 / dimethylformamide / 2 h / 25 °C 2: 1) K2CO3, 2) 1 M NaOH / 1) DMSO, 25 deg C, 10 min, 2) DMSO, H2O, 25 deg C, 1 h 3: 78 percent / NaBH4 / ethanol / 3 h / 5 - 25 °C 4: 30 percent Chromat. / O2, Rose Bengal / acetonitrile / 13 °C / Irradiation 5: 96 percent / K2CO3 / dimethylformamide / 2 h / 25 °C 6: 52 percent / CuBr2 / ethyl acetate 7: 92 percent / K2CO3 / dimethylformamide / 2 h / 25 °C 8: 90 percent / K2CO3 / dimethylsulfoxide / 0.17 h / 25 °C 9: O2, Rose Bengal / acetonitrile / 13 °C / Irradiation View Scheme

1: 1) K2CO3, 2) 1 M NaOH / 1) DMSO, 25 deg C, 10 min, 2) DMSO, H2O, 25 deg C, 1 h 2: 78 percent / NaBH4 / ethanol / 3 h / 5 - 25 °C 3: 30 percent Chromat. / O2, Rose Bengal / acetonitrile / 13 °C / Irradiation 4: 96 percent / K2CO3 / dimethylformamide / 2 h / 25 °C 5: 52 percent / CuBr2 / ethyl acetate 6: 92 percent / K2CO3 / dimethylformamide / 2 h / 25 °C 7: 90 percent / K2CO3 / dimethylsulfoxide / 0.17 h / 25 °C 8: O2, Rose Bengal / acetonitrile / 13 °C / Irradiation View Scheme

1: 52 percent / CuBr2 / ethyl acetate 2: 92 percent / K2CO3 / dimethylformamide / 2 h / 25 °C 3: 90 percent / K2CO3 / dimethylsulfoxide / 0.17 h / 25 °C 4: O2, Rose Bengal / acetonitrile / 13 °C / Irradiation View Scheme

1: 92 percent / K2CO3 / dimethylformamide / 2 h / 25 °C 2: 90 percent / K2CO3 / dimethylsulfoxide / 0.17 h / 25 °C 3: O2, Rose Bengal / acetonitrile / 13 °C / Irradiation View Scheme

1: 96 percent / K2CO3 / dimethylformamide / 2 h / 25 °C 2: 52 percent / CuBr2 / ethyl acetate 3: 92 percent / K2CO3 / dimethylformamide / 2 h / 25 °C 4: 90 percent / K2CO3 / dimethylsulfoxide / 0.17 h / 25 °C 5: O2, Rose Bengal / acetonitrile / 13 °C / Irradiation View Scheme

1: 90 percent / K2CO3 / dimethylsulfoxide / 0.17 h / 25 °C 2: O2, Rose Bengal / acetonitrile / 13 °C / Irradiation View Scheme