boron tribromide in dichloromethane T=20°C; 72 h;

1.1: powdery molecular sieves; NaH / tetrahydrofuran; various solvent(s) / 0.75 h / 60 °C 1.2: 83 percent / tetrahydrofuran; various solvent(s) / 6 h / Heating 2.1: 84 percent / BBr3 / CH2Cl2 / 72 h / 20 °C View Scheme

1.1: 22 percent / hydroxylamine hydrochloride; K2CO3 / ethanol / 18 h / Heating 2.1: powdery molecular sieves; NaH / tetrahydrofuran; various solvent(s) / 0.75 h / 60 °C 2.2: 83 percent / tetrahydrofuran; various solvent(s) / 6 h / Heating 3.1: 84 percent / BBr3 / CH2Cl2 / 72 h / 20 °C View Scheme

1: 80 percent / NH2OH*HCl, Na2CO3 / ethanol; H2O / 2 h / Heating 2: 0.25 h / 110 °C View Scheme

pyridine

2: water / 100 °C / im Rohr View Scheme

T=110°C; 0.25 h;

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