HRID1713627

反应详情

EQUATION

反应方程式

HRID 1713627 的结构方程式

AUXILIARIES

试剂、催化剂与溶剂

3

CONDITIONS

反应条件

温度
0 °C

PROCEDURE

实验过程

To a suspension of 22.0 g (0.101 mol) of 3-nitro-1-napthalene-carboxylic acid (prepared according to procedures in Duffy, K. J., et. al. J. Med. Chem. 2001, 44, 3730-3745) in 1,000 mL of anhydrous dichloromethane at 0° C. under an atmosphere of nitrogen was added 9.8 mL (0.11 mol) of oxalyl chloride followed by 0.80 mL (10 mmol) of anhydrous N,N-dimethylformamide. The reaction mixture was allowed to gradually warm to ambient temperature for 3 h until gas evolution ceased, and the resulting homogeneous solution was concentrated in vacuo to remove all volatiles. The residue was then dissolved in 1 L of anhydrous dichloromethane and 20 mL (0.51 mol) of anhydrous methanol was added. After stirring for 1 h, the reaction was carefully quenched with a saturated aqueous sodium bicarbonate solution (500 mL). The organic layer was separated and the aqueous layer was extracted with dichloromethane (2×250 mL). The combined organic layers were washed with brine (300 mL), dried over magnesium sulfate, filtered and concentrated in vacuo to yield the title compound as a pale yellow solid which was used without further purification. LC/MS 232.2 (M+1). Step B: Methyl 3-amino-1-naphthoate. To 1.15 g (1.08 mmol) of 10% palladium on carbon was added a suspension of 11.6 g (50.0 mmol) of the above methyl 3-nitro-1-naphthoate in 150 mL of anhydrous ethanol and 40 mL of anhydrous dichloromethane. The resulting suspension was agitated under an atmosphere of hydrogen at 40 psi for 3 h during which time all solids dissolved. The reaction mixture was filtered through a plug of Celite®, which was subsequently washed with dichloromethane (300 mL). The combined filtrates were concentrated in vacuo to yield the title compound as a pale green gum which was used without further purification. LC/MS 202.1 (N+1). Step C: Methyl 3-bromo-1-naphthoate. A solution of 4.34 g (62.9 mmol) of sodium nitrite in 40 mL of water was added dropwise to a 0° C. solution of 11.5 g (57.2 mmol) of methyl 3-amino-1-naphthoate in 300 mL of ethanol and 60 mL of 48% aqueous hydrobromic acid while maintaining an internal reaction temperature below 10° C. After complete addition of the aqueous solution the resulting dark red reaction mixture was stirred at 0° C. for an additional 30 min. The cooled (0° C.) reaction mixture was then added over 20 min. to a suspension of 8.21 g (57.2 mmol) of cuprous bromide in 60 mL of ethanol and 60 mL of 48% aqueous hydrobromic acid heated to 95° C. After stirring for 30 min. the reaction mixture was cooled to 0° C. and carefully partitioned between ethyl ether (250 mL) and water (600 mL). The organic layer was separated and the aqueous layer was extracted with ethyl ether (2×300 mL). The combined organic layers were washed with brine (100 mL), dried over magnesium sulfate, filtered and concentrated in vacuo. The residue was passed through a plug of silica gel eluting with 30% dichloromethane in hexanes and the filtrate concentrated in vacuo. Flash chromatography on a Biotage® purification apparatus (silica gel, 7% dichloromethane/hexanes) yielded the title compound as a colorless solid. 1H NMR (DMSO-d6): δ 8.67 (d, J=8.4 Hz, 1H), 8.50 (s, 1H), 8.15 (s, 1H), 8.02 (d, J=8.0 Hz, 1H), 7.68-7.71 (m, 1H), 7.63-7.66 (t, J=7.6 Hz, 1H), 3.94 (s, 3H). LC/MS 265.0 (M+1) and 267.0 (M+3). Step D: (3-Bromo-1-naphthyl)methanol. To a solution of 5.10 g (19.2 mmol) of the above methyl 3-bromo-1-naphthoate in 20 mL of anhydrous tetrahydrofuran at −78° C. under an atmosphere of nitrogen was added 48 mL (48 mmol) of a 1.0 M solution of diisobutylaluminum hydride in toluene. The resulting solution was allowed to gradually warm to 0° C. over 90 min and quenched with a saturated aqueous solution of potassium sodium tartrate (25 mL). The resulting suspension was vigorously stirred with gradual warming to ambient temperature over 2 h and the layers separated. The aqueous layer was extracted with ethyl acetate (3×20 mL) and the combined organic layers were washed with brine (30 mL), dried over magnesium sulfate, filtered and concentrated in vacuo to afford the title compound as a white solid which was used without further purification LC/MS 237.0 (M+1) and 239.0 (M+3). Step E: [(3-Bromo-1-naphthyl)methoxy](triisopropyl)silane. To a solution of 4.56 g (19.2 mmol) of (3-bromo-1-naphthyl)methanol in 10 mL of anhydrous N,N-dimethylformamide was added 2.88 g (42.3 mmol) of imidazole, 117 mg (0.962 mmol) of 4-(dimethylamino)pyridine and 4.5 mL (21 mmol) of triisopropylsilyl chloride. The resulting solution was stirred at ambient temperature for 15 h, diluted with a saturated aqueous ammonium chloride solution (100 mL) and extracted with ether (3×40 mL). The combined organic layers were washed with water (2×30 mL) then brine (25 mL), dried over magnesium sulfate, filtered and concentrated in vacuo. The crude residue was purified on a Biotage® purification apparatus (silica gel, 3% methylene chloride in hexanes) to yield intermediate 9 as a colorless oil. LC/MS 393.0 (M+1) and 395.0 (M+3).

WORKUP

后处理

  1. customwas used without further purification
  2. temperaturewhile maintaining an internal reaction temperature below 10° C
  3. additionAfter complete addition of the aqueous solution
  4. customthe resulting dark red reaction mixture
  5. temperatureThe cooled
  6. custom(0° C.) reaction mixture
  7. temperatureheated to 95° C
  8. stirringAfter stirring for 30 min. the reaction mixture
  9. temperaturewas cooled to 0° C.
  10. customcarefully partitioned between ethyl ether (250 mL) and water (600 mL)
  11. customThe organic layer was separated
  12. extractionthe aqueous layer was extracted with ethyl ether (2×300 mL)
  13. washThe combined organic layers were washed with brine (100 mL)
  14. dry with materialdried over magnesium sulfate
  15. filtrationfiltered
  16. concentrationconcentrated in vacuo
  17. concentrationthe filtrate concentrated in vacuo
  18. customFlash chromatography on a Biotage® purification apparatus (silica gel, 7% dichloromethane/hexanes)