1: 85 percent / pyridine / CH2Cl2 / 1 h / 0 °C 2: 88 percent / CHCl3; diethyl ether / 18 h / 0 °C 3: 94 percent / benzophenone / benzene; acetonitrile / 2 h / Irradiation 4: 1) disiamylborane, 2) aq. 27percent H2O2, 2 M NaOH / 1) THF, a) room temp., b) water, reflux, 30 min 5: 450 mg / pyridine, 4-dimethylaminopyridine / CHCl3 / 72 h 6: 37 percent / EtAlCl2 / toluene; CH2Cl2 / 0.67 h / Ambient temperature 7: 30 mg / methanolic ammonia / 24 h / Ambient temperature View Scheme

1: 88 percent / CHCl3; diethyl ether / 18 h / 0 °C 2: 94 percent / benzophenone / benzene; acetonitrile / 2 h / Irradiation 3: 1) disiamylborane, 2) aq. 27percent H2O2, 2 M NaOH / 1) THF, a) room temp., b) water, reflux, 30 min 4: 450 mg / pyridine, 4-dimethylaminopyridine / CHCl3 / 72 h 5: 37 percent / EtAlCl2 / toluene; CH2Cl2 / 0.67 h / Ambient temperature 6: 30 mg / methanolic ammonia / 24 h / Ambient temperature View Scheme