反应详情

温度

65 °C

To a solution of dimethyl bicyclo[2.2.2]octane-1,4-dicarboxylate (0.92 g, 4.07 mmol) in MeOH (5 mL) was added LiOH (0.102 g, 4.27 mmol) in water (4 mL) at RT. The reaction mixture was heated at 65° C. for 6 h. It was then cooled to RT and concentrated. The residue was acidified with 1N HCl to pH ˜2. The solid (presumed side product diacid) was removed by filtration. The filtrate was extracted with EtOAc, and the combined organic layer was washed with brine, dried over Na2SO4, and filtered. The filtrate was concentrated to afford Intermediate A51A as a white solid, which was used for the next step without further purification. MS(ES): m/z=213 [M+H]+; 1H NMR (400 MHz, DMSO-d6) δ ppm 12.11 (s, 1H), 3.66 (s, 3H), 1.78-1.58 (m, 1H).

1. temperatureIt was then cooled to RT
2. concentrationconcentrated
3. customThe solid (presumed side product diacid) was removed by filtration
4. extractionThe filtrate was extracted with EtOAc
5. washthe combined organic layer was washed with brine
6. dry with materialdried over Na2SO4
7. filtrationfiltered
8. concentrationThe filtrate was concentrated
9. customto afford Intermediate A51A as a white solid, which
10. customwas used for the next step without further purification