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温度

0 °C

Trifluoroacetic acid (100 mL) was cooled to 0° C. and added to a flask containing 1-(1,1-dimethylethyl-oxycarbonyl)piperidin-4-yl-pyridin-3-ylmethanol (20.4 g, 69.77 mmol). Vigorous gas evolution was observed. The mixture was stirred at 0° C. until judged complete by TLC. The excess trifluoroacetic acid was removed in vacuo, and the resulting residue was dissolved in water (50 mL). The aqueous solution was cooled to 0° C. and basified to pH~ 12 by addition of sodium hydroxide pellets. The product was isolated by extraction of the aqueous solution with dichloromethane (10×100 mL). The dichloromethane was evaporated to leave the title compound as an off white solid (12.06 g, 62.73 mmol, 90%). 1H NMR(d6 -DMSO): δ8.45 (m, 2H, H--C(2'), H--C(6')), 7.66 (brd, J=7.8 Hz, 1H, H--C(4')), 7.34 (dd, J=4.8, 7.8 Hz, 1H, H--C(3')), 4.29 (d, J=6.7 Hz, 1H, CHOH), 2.67 (m, 2H, eq-H--C(2)), 2.27 (m, 2H, ax-H--C(2)), 1.70 (br, 1H, NH), 1.52 (m, 1H, H--C(4)), 1.10-1.00 (m, 4H, H--C(3)).

1. additionadded to a flask
2. customThe excess trifluoroacetic acid was removed in vacuo
3. dissolutionthe resulting residue was dissolved in water (50 mL)
4. temperatureThe aqueous solution was cooled to 0° C. and basified to pH~ 12 by addition of sodium hydroxide pellets
5. customThe product was isolated by extraction of the aqueous solution with dichloromethane (10×100 mL)
6. customThe dichloromethane was evaporated