反应详情

A solution of 30 mg (0.076 mmol) of [9-benzyl-4-carbamoyl-1,2,3,4-tetrahydrocarbazole-5-yl]oxyacetic acid, methyl ester in 1.0 mL of THF and 1.0 mL of MeOH was treated with 0.2 mL of 1 N aqueous LiOH (0.2 mmol). The mixture was stirred for 18 hours. An additional 0.2 mL of 1 N aqueous LiOH (0.2 mmol) was added and stirring continued. After 1 hour, the mixture was concentrated in vacuo. The residue was dissolved in 2.0 mL of H2O and the solution acidified with 0.2 N aqueous HCl. The solid was filtered and dried to afford 25 mg of [9-benzyl-4-carbamoyl-1,2,3,4-tetrahydrocarbazole-5-yl]oxyacetic acid as a white solid. 1H NMR (DMSO-d6) δ7.36-7.12 (m, 5H), 7.05-6.83 (m, 5H), 6.71 (br s, 1H), 6.35 (d, 1H, J=7.6 Hz), 5.27 (s, 2H), 4.64 (s, 2H), 3.93-3.84 (m, 2H), 2.75-2.64 (m, 1H), 2.16-1.95 (m, 2H), 1.81-1.64 (m, 2H) and 1 proton masked by H2O peak between 2.58-2.40. IR (KBr, cm−1) 3435, 2936, 1722, 1644, 1586, 1566, 1495, 1451, 1354, 1227, 1134, 730, 716, and 698. MS (ES) m/e 377 (M−1) and 379 (M+1).

1. stirringstirring
2. waitAfter 1 hour
3. concentrationthe mixture was concentrated in vacuo
4. dissolutionThe residue was dissolved in 2.0 mL of H2O
5. filtrationThe solid was filtered
6. customdried