oxygen in dichloromethane 10 h; Irradiation;

1: NaH / tetrahydrofuran / 4.5 h / 20 °C 2: 1.) LDA / 1.) THF, -60 deg C, 2 h, 2.) THF, 1 h 3: 33 percent / CH2Cl2 / 24 h / 20 °C 4: 76 percent / AlCl3 / CH2Cl2 / 0.17 h / 20 °C 5: 78 percent / KF, KHCO3, 30percent H2O2/H2O / tetrahydrofuran; methanol / 17 h / 20 °C 6: 70 percent / O2 / Irradiation View Scheme

1: 1.) LDA / 1.) THF, -60 deg C, 2 h, 2.) THF, 1 h 2: 33 percent / CH2Cl2 / 24 h / 20 °C 3: 76 percent / AlCl3 / CH2Cl2 / 0.17 h / 20 °C 4: 78 percent / KF, KHCO3, 30percent H2O2/H2O / tetrahydrofuran; methanol / 17 h / 20 °C 5: 70 percent / O2 / Irradiation View Scheme

1: 78 percent / KF, KHCO3, 30percent H2O2/H2O / tetrahydrofuran; methanol / 17 h / 20 °C 2: 70 percent / O2 / Irradiation View Scheme

1: 76 percent / AlCl3 / CH2Cl2 / 0.17 h / 20 °C 2: 78 percent / KF, KHCO3, 30percent H2O2/H2O / tetrahydrofuran; methanol / 17 h / 20 °C 3: 70 percent / O2 / Irradiation View Scheme

1: 1.) 5percent MeLi / 1.) HMPT, ether, 0 deg C, 15 min, 2.) HMPT, ether, THF, -78 deg C, 15 min 2: 95 percent / lithium diisopropylamide / tetrahydrofuran 3: 1.)lithium diisopropylamide / 1.) -78 deg C 4: 2.) AlCl3 5: 78 percent / KF, H2O2 6: 70 percent / O2 / CH2Cl2 / 10 h / Irradiation View Scheme