1: 2-fluoro-pyridine With lithium diisopropyl amide in tetrahydrofuran T=-78°C; 4 h; 2: methyl chloroformate in tetrahydrofuran T=-78 - 20°C; Further stages.;

fluorine in tetrachloromethane T=0°C; Title compound not separated from byproducts;

1: aqueous HBF4; NaNO2 / -5 - 0 °C / anschliessendes Erwaermen 2: H2SO4 View Scheme

sulfuric acid

ethanol; ammonia

1.1: CH2Cl2 / 0.5 h / 20 °C 2.1: LDA / tetrahydrofuran / 0.5 h / -78 °C 2.2: tetrahydrofuran / 1.5 h / -30 °C 3.1: 59 mg / DDQ / tetrahydrofuran; methanol / 4 h / 20 °C 4.1: 60 percent / AIBN; TTMSS / benzene / 4 h / Heating 5.1: DIBAL / CH2Cl2 / 0.75 h / -78 - -30 °C 5.2: 45 percent / NaBH4 / methanol; CH2Cl2 / 1 h / 0 °C 6.1: 60 percent / I2; CaCO3 / methanol; H2O / 96 h / 20 °C View Scheme

N-ethyl-N,N-diisopropylamine in N,N-dimethyl acetamide T=150°C; P=12929 Torr;