反应详情

Diester 11-2 (0.625 g, 1.90 mmol) was dissolved in a 1:1 mixture of ethyl acetate/methanol (30 mL), placed under nitrogen atmosphere, then treated with 10% Pd/C (500 mg) and 0.1 mL of acetic acid. The reaction was placed under hydrogen atmosphere and stirred vigorously for 2 hr. The resulting solution was filtered through celite and the solvent was removed under reduced pressure. The residue was partitioned between 200 mL of ethyl acetate and 200 mL of 1 N NaOH solution. The aqueous layer was separated and neutralized, then extracted three times with 50 mL of methylene chloride. The combined organic layers were dried over magnesium sulfate and the solvent was removed under reduced pressure to afford 3-[4-(methoxycarbonyl)bicyclo[2.2.2]oct-1-yl]propanoic acid (11-3). 1H NMR (500 MHz, CDCl3): δ 3.62 (3H, s), 2.20 (2H, broad t, J=9 Hz), 1.75 (6H, m), 1.47 (2H, broad t, J=9 Hz), 1.38 (6H, m) ppm.

1. filtrationThe resulting solution was filtered through celite
2. customthe solvent was removed under reduced pressure
3. customThe residue was partitioned between 200 mL of ethyl acetate and 200 mL of 1 N NaOH solution
4. customThe aqueous layer was separated
5. extractionextracted three times with 50 mL of methylene chloride
6. dry with materialThe combined organic layers were dried over magnesium sulfate
7. customthe solvent was removed under reduced pressure