反应详情

To a solution of (R)-1-{4-[4-(3-chloro-benzylidene)-piperidin-1-yl]-pyrimidin-2-yl}-ethyl butyrate (prepared according to the method of Example 176, Step C, 0.62 g, 1.55 mmol) in methanol (8 mL) was added 1 N aqueous sodium hydroxide (1 mL) then stirred for 4 h at ambient temperature. The mixture was diluted with chloroform and washed once with water, once with saturated aqueous sodium chloride and the organic layer was dried over sodium sulfate and filtered. The filtrate was concentrated to obtain a crude product which was purified by flash chromatography (95:5 dichloromethane:methanol) to give the title compound as a white solid, 0.31 g (61%). 1H NMR (CDCl3, 300 MHz) 81.51 (d, 3H), 2.46 (m, 2H), 2.56 (m, 2H), 3.07 (m, 2H), 3.77 (m, 2H), 4.35 (d, 1H), 4.69 (q, 1H), 6.36 (s, 1H), 6.40 (d, 1H), 7.07 (m, 1H), 7.12-7.28 (m, 3H), 8.18 (m, 1H); mp: 45-55° C.; MS (CI) 330 (MH+); [α]D+16.8 (c 1.0, MeOH).

1. washwashed once with water, once with saturated aqueous sodium chloride
2. dry with materialthe organic layer was dried over sodium sulfate
3. filtrationfiltered
4. concentrationThe filtrate was concentrated
5. customto obtain a crude product which
6. customwas purified by flash chromatography (95:5 dichloromethane:methanol)