Reaktion #7854

Reaktionsgleichung

2-aminophenol

triethylamine

3-cyano-4-methoxy-benzoic acid

SOCl2

p-toluenesulfonic acid

→

5-(1,3-benzoxazol-2-yl)-2-methoxy benzonitrile

Lösungsmittel

THF

EtOAc

Reaktionsbedingungen

Aufarbeitung

1. 1
   TemperaturThe reaction was refluxed for 1 h
2. 2
   SonstigeThe excess of SOCl2 was removed in vacuo
3. 3
   workup.DISSOLUTIONthe oily acid chloride was dissolved in THF (15 mL)
4. 4
   TemperaturThe reaction was warmed up to rt
5. 5
   SonstigeThe precipitate was removed by filtration
6. 6
   Einengenthe filtrate was concentrated
7. 7
   Sonstigedried in vacuo
8. 8
   workup.DISSOLUTIONThe dark brown solid residue was dissolved in toluene (20 mL)
9. 9
   TemperaturThe reaction was refluxed overnight
10. 10
    Temperaturcooled to rt
11. 11
    WaschenThe EtOAc solution was washed with brine (3×20 mL)
12. 12
    Trocknendried (MgSO4)
13. 13
    Filtrationfiltered
14. 14
    Einengenconcentrated in vacuo
15. 15
    SonstigeThe residue was purified by flash chromatography (silica gel, CHCl3:CH3OH 8:1)

Vorschrift

To a solution of methyl 3-cyano-4-methoxy-benzoate (1.5 g, 7.9 mmol) in CH3OH/H2O (25 mL; 1:1), was added LiOH (2.5 g, 60.0 mmol). The reaction mixture was refluxed for 2 h, cooled at rt and 6M HCl was added dropwise until pH 2 was obtained. The precipitate was collected, washed with H2O (3×20 mL), dried in vacuo to afford 3-cyano-4-methoxy-benzoic acid. MS (ESI) 178 (M+H)+. To a 100 mL round-bottom flask with 3-cyano-4-methoxy-benzoic acid (1.4 g, 7.8 mmol), was added SOCl2 (15 mL) dropwise. The reaction was refluxed for 1 h and was cooled to rt. The excess of SOCl2 was removed in vacuo and the oily acid chloride was dissolved in THF (15 mL). The resulting solution was added dropwise to a mixture of 2-aminophenol (1.3 g, 11.7 mmol), triethylamine (1.3 g, 11.7 mmol) and THF (30 mL) at 0° C. The reaction was warmed up to rt and stirred an additional 3 h. The precipitate was removed by filtration and the filtrate was concentrated and dried in vacuo. The dark brown solid residue was dissolved in toluene (20 mL) and p-toluenesulfonic acid (6.0 g, 46.8 mmol) was added. The reaction was refluxed overnight, cooled to rt, and EtOAc (300 mL) was added. The EtOAc solution was washed with brine (3×20 mL), dried (MgSO4), filtered and concentrated in vacuo. The residue was purified by flash chromatography (silica gel, CHCl3:CH3OH 8:1) to afford 5-(1,3-benzoxazol-2-yl)-2-methoxy benzonitrile. MS ESI) 251(M+H)+.

Quelle