反应详情

温度

2 °C

To a solution of 1-benzyl-2-carboethoxy-4-methoxy-6,7,8,9-tetrahydro-1H-benz[g]indole (1.01 g, 2.77 mmol) in tetrahydrofuran (8 mL) cooled to 0° C. was added 0.5 M Tebbe Reagent in toluene (6.5 mL, 3.3 mmol). The mixture was stirred for 1 h at 2° C. then diluted with diethyl ether (32 mL) and treated with 2 N aqueous sodium hydroxide solution (2 mL) over 30 min. The mixture was diluted with excess saturated sodium bicarbonate solution and filtered through a pad of silica gel. The filtrate was concentrated in vacuo and the resulting residue triturated with 1:1 ether/hexanes. The resulting material was dissolved in 4:1 acetone/methylene chloride (5 mL) and treated with 1 N hydrochloric acid (1 mL). After standing for 20 min the mixture was diluted with saturated sodium bicarbonate solution, concentrated in vacuo, and partitioned between methylene chloride and water. The organic layer was separated, dried (sodium sulfate), filtered, and concentrated in vacuo. Purification of the residue by chromatography (silica gel, methylene chloride) provided 673 mg (73%) of the title compound as a brown film. 1H NMR (CDCl3) δ 7.49 (s, 1H), 7.15 (m, 3H), 6.78 (d, J=7 Hz, 2H), 6.24 (s, 1H), 6.11 (bs, 2H), 3.91 (s, 3H), 2.95 (m, 2H), 2.84 (m, 2H), 2.52 (s, 2H), 1.69 (m, 4H); MS ES+ m/e 334 (p+1); IR (KBr, cm−1) 3400, 2813, 1593, 1292.

1. filtrationfiltered through a pad of silica gel
2. concentrationThe filtrate was concentrated in vacuo
3. customthe resulting residue triturated with 1:1 ether/hexanes
4. dissolutionThe resulting material was dissolved in 4:1 acetone/methylene chloride (5 mL)
5. additiontreated with 1 N hydrochloric acid (1 mL)
6. waitAfter standing for 20 min
7. additionthe mixture was diluted with saturated sodium bicarbonate solution
8. concentrationconcentrated in vacuo
9. custompartitioned between methylene chloride and water
10. customThe organic layer was separated
11. dry with materialdried (sodium sulfate)
12. filtrationfiltered
13. concentrationconcentrated in vacuo
14. customPurification of the residue by chromatography (silica gel, methylene chloride)