Dess-Martin periodane in dichloromethane T=0 - 20°C; 1 h;

diisobutylaluminium hydride in tetrahydrofuran; toluene T=-40 - 20°C; 0.333333 h;

1: 3,5-dibromo-phenol With n-butyllithium; n-butyl-magnesium chloride in hexane; toluene T=-15°C; 2.5 h; 2: N,N-dimethyl-formamide in hexane; toluene T=-15 - 0°C;

1: oxalyl dichloride; N,N-dimethyl-formamide / dichloromethane / 0.5 h / 0 °C 2: triethylamine / dichloromethane / 1 h / 0 °C 3: diisobutylaluminium hydride / tetrahydrofuran; toluene / 0.33 h / -40 - 20 °C View Scheme

1: triethylamine / dichloromethane / 1 h / 0 °C 2: diisobutylaluminium hydride / tetrahydrofuran; toluene / 0.33 h / -40 - 20 °C View Scheme