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温度

0 °C

Tert-butyldimethylsilyl trifluoromethanesulfonate (2.180 mL, 9.49 mmol) was added to a solution of 2-(6-fluoropyridin-3-yl)-2-methylpropan-1-ol (1.46 g, 8.63 mmol) and N,N-diisopropylethylamine (3.31 mL, 18.98 mmol) in CH2Cl2 (43.1 mL) at 0° C., and the resulting mixture stirred at 0° C. for 30 min. The reaction mixture was subsequently concentrated onto silica gel and chromatographically purified (silica gel, 0 to 15% EtOAc/hexanes) to provide 5-(1-(tert-butyldimethylsilyloxy)-2-methylpropan-2-yl)-2-fluoropyridine (2.22 g, 7.83 mmol, 91% yield) as a colorless oil. 1H NMR (400 MHz, CDCl3) δ 8.20 (d, J=2.0 Hz, 1H), 7.79 (td, J=8.2, 2.7 Hz, 1H), 6.85 (dd, J=8.6, 2.9 Hz, 1H), 3.51 (s, 2H), 1.31 (s, 6H), 0.83 (s, 9H), −0.06 (s, 6H). 19F NMR (377 MHz, CDCl3) δ −73.08 (d, J=6.0Hz, 1F). m/z (ESI, +ve) 284.3 (M+H)+.

1. concentrationThe reaction mixture was subsequently concentrated onto silica gel
2. customchromatographically purified (silica gel, 0 to 15% EtOAc/hexanes)