反应详情

A solution of 1-benzyl-2-ethyl-4-methoxy-6,7,8,9-tetrahydro-1H-benz[g]indole (660 mg, 2.07 mmol) in methylene chloride (10 mL) was cooled to 0° C. and treated with boron tribromide (0.38 mL, 4.0 mmol). The mixture was stirred for 10 min, poured into ice water, and extracted twice with methylene chloride. The combined methylene chloride layers were washed once with saturated sodium bicarbonate solution, dried (sodium sulfate), filtered, and concentrated in vacuo. The residue was dissolved in N,N-dimethylformamide (10 mL) and treated with cesium carbonate (652 mg, 2.00 mmol) and methyl bromoacetate (0.28 mL, 2.0 mmol) at room temperature for 3 h. The mixture was diluted with water and extracted three times with ether. The combined ether extracts were washed once with water, dried (magnesium sulfate), filtered, and concentrated in vacuo. Chromatography (silica gel, methylene chloride) provided 479 mg (62%) of the title compound as an off-white solid. 1H NMR (CDCl3) δ 7.25 (m, 3H), 6.85 (d, J=7.6 Hz, 2H), 6.52 (s, 1H), 6.16 (s, 1H), 5.57 (s, 2H), 4.79 (s, 2H), 3.86 (s, 3H), 2.97 (m, 2H), 2.84 (m, 2H), 2.59 (q, J=7.3 Hz, 2H), 1.72 (m, 4H), 1.32 (t, J=7.3 Hz, 3H); MS ES+ m/e 378 (p+1); IR (CHCl3, cm1) 2830, 1756, 1732.

1. extractionextracted twice with methylene chloride
2. washThe combined methylene chloride layers were washed once with saturated sodium bicarbonate solution
3. dry with materialdried (sodium sulfate)
4. filtrationfiltered
5. concentrationconcentrated in vacuo
6. dissolutionThe residue was dissolved in N,N-dimethylformamide (10 mL)
7. extractionextracted three times with ether
8. washThe combined ether extracts were washed once with water
9. dry with materialdried (magnesium sulfate)
10. filtrationfiltered
11. concentrationconcentrated in vacuo