反应详情

温度

50 °C

A mixture of 2-benzyloxy-N-(4-fluoro-phenyl)-acetamide (33) (5.3 g, 22 mmol) and 3-bromo-2-oxo-cyclohexanecarboxylic acid diethylamide (35) (3.0 g, 13 mmol)) was stirred under N2 at 50° C. for 3 h and the reaction turned brown. The resulting mixture was dissolved in propan-2-ol (30 mL) and dry zinc chloride (9.0 g, 66 mmol) was added. The mixture was heated to reflux under N2 for 16 h and then concentrated in vacuo. The residue was dissolved in ethyl acetate (300 mL) and washed with 2 N HCl (100 mL), water (2×100 mL) and aqueous potassium carbonate solution (2×100 mL) then dried and concentrated in vacuo. The crude material was purified by silica gel chromatography eluting with petrol (A) and ethyl acetate (B) (10-50% B, 100 g) to afford 196 mg (11%) of 9-(2-benzyloxy-ethyl)-6-fluoro-2,3,4,9-tetrahydro-1H-carbazole-4-carboxylic acid diethylamide (36) as a white solid. The structure was confirmed by 1H NMR (300 MHz, CDCl3) δH 1.14 (3H, t, J=7 Hz, N(CH2CH3)2), 1.30 (3H, t, J=7 Hz, N(CH2CH3)2), 1.60-2.60 (4H, m, 2- and 3-CH2), 2.70-2.85 (2H, m, 1-CH2), 3.10-3.65 (4H, m, N(CH2CH3)2 and NCH2CH2OBn), 3.66-3.75 (1H, m, 4-CH), 4.00-4.25 (2H, m, NCH2CH2OBn), 4.41 (2H, s, OCH2Ph), 6.75-6.95 (2H, m, NCCHCHCFCH), 7.05-7.15 (1H, m, NCCHCHCFCH), and 7.16-7.25 (5H, m, Ph).

1. temperatureThe mixture was heated
2. temperatureto reflux under N2 for 16 h
3. concentrationconcentrated in vacuo
4. dissolutionThe residue was dissolved in ethyl acetate (300 mL)
5. washwashed with 2 N HCl (100 mL), water (2×100 mL) and aqueous potassium carbonate solution (2×100 mL)
6. customthen dried
7. concentrationconcentrated in vacuo
8. customThe crude material was purified by silica gel chromatography
9. washeluting with petrol (A) and ethyl acetate (B) (10-50% B, 100 g)