Reaction #69062

Reaction equation

4-Fluoro-3-hydroxybenzoic acid

DMF

(chloromethyl)cyclopropane

potassium carbonate

potassium iodide

→

title compound

(3-(cyclopropylmethoxy)-4-fluorophenyl)methanamine

Solvents

water

Conditions

Workup

1. 1
   TemperatureThe reaction mixture was cooled to room temperature
2. 2
   Extractionthe resultant mixture was then extracted with toluene (120 mL)
3. 3
   WashThe organic layer was washed with brine (100 mL)
4. 4
   Dryingdried over anhydrous sodium sulfate
5. 5
   Concentrationconcentrated under reduced pressure
6. 6
   workup.DISSOLUTIONThe residue was dissolved in toluene (65 mL)
7. 7
   workup.ADDITIONwas added dropwise at 0° C.
8. 8
   workup.STIRRINGthe reaction mixture was stirred at 0° C. for 2 hours
9. 9
   workup.ADDITIONTo the reaction mixture, water (10 mL) and an aqueous sodium hydroxide solution (1.0 M, 10 mL) were gradually added
10. 10
    OtherThe resultant precipitate was removed by filtration
11. 11
    Washwashed with ethyl acetate (100 mL×5)
12. 12
    ConcentrationThen, the combined filtrate was concentrated under reduced pressure
13. 13
    workup.ADDITIONTo the residue, water (100 mL) was added
14. 14
    Extractionthe resultant mixture was then extracted with ethyl acetate (150 mL)
15. 15
    WashThe organic layer was washed with brine (50 mL)
16. 16
    Dryingdried over anhydrous sodium sulfate
17. 17
    Concentrationconcentrated under reduced pressure
18. 18
    OtherThe residue was purified by silica gel column chromatography (40% ethyl acetate/hexane)
19. 19
    workup.DISSOLUTIONThe obtained compound was dissolved in THF (75 mL)
20. 20
    workup.ADDITIONwere added dropwise at room temperature
21. 21
    workup.STIRRINGthe mixture was stirred at room temperature for 1 hour
22. 22
    workup.ADDITIONTo the reaction mixture, brine (100 mL) was added
23. 23
    Extractionthe aqueous layer was extracted with ethyl acetate (100 mL×2)
24. 24
    WashThe organic layer was washed with brine (100 mL)
25. 25
    Dryingdried over anhydrous sodium sulfate
26. 26
    Concentrationconcentrated under reduced pressure
27. 27
    OtherThe residue was purified by silica gel column chromatography (20% ethyl acetate/hexane)
28. 28
    workup.DISSOLUTIONThe obtained compound was dissolved in THF (80 mL)
29. 29
    workup.ADDITIONTo the solution, a solution of LAH in THF (2.4 M, 40 mL) was gradually added dropwise at 0° C.
30. 30
    workup.STIRRINGthe mixture was stirred at 0° C. for 1 hour
31. 31
    workup.ADDITIONTo the reaction mixture, water (5.0 mL) and aqueous sodium hydroxide solution (1.0 M, 5.0 mL) were gradually added dropwise at 0° C
32. 32
    OtherThe resultant precipitate was removed by filtration
33. 33
    Washwashed with 10% methanol/THF (200 mL)
34. 34
    ConcentrationThen, the combined filtrate was concentrated under reduced pressure
35. 35
    workup.ADDITIONTo the residue, brine (100 mL) was added
36. 36
    Extractionthe resultant mixture was then extracted with ethyl acetate (150 mL)
37. 37
    DryingThe organic layer was dried over anhydrous sodium sulfate
38. 38
    Concentrationconcentrated under reduced pressure

Procedure

4-Fluoro-3-hydroxybenzoic acid (15.0 g) was dissolved in DMF (200 mL). To the solution, (chloromethyl)cyclopropane (18.0 mL), potassium carbonate (29.2 g), and potassium iodide (1.6 g) were added, and the mixture was stirred at 90° C. for 6 hours. The reaction mixture was cooled to room temperature, water (120 mL) was then added thereto, and the resultant mixture was then extracted with toluene (120 mL). The organic layer was washed with brine (100 mL), dried over anhydrous sodium sulfate, and then concentrated under reduced pressure. The residue was dissolved in toluene (65 mL). To the solution, a solution of diisobutylaluminum hydride in hexane (hereinafter, referred to as DIBAL) (1.0 M, 130 mL) was added dropwise at 0° C., and the reaction mixture was stirred at 0° C. for 2 hours. To the reaction mixture, water (10 mL) and an aqueous sodium hydroxide solution (1.0 M, 10 mL) were gradually added. The resultant precipitate was removed by filtration and washed with ethyl acetate (100 mL×5). Then, the combined filtrate was concentrated under reduced pressure. To the residue, water (100 mL) was added, and the resultant mixture was then extracted with ethyl acetate (150 mL). The organic layer was washed with brine (50 mL), dried over anhydrous sodium sulfate, and then concentrated under reduced pressure. The residue was purified by silica gel column chromatography (40% ethyl acetate/hexane). The obtained compound was dissolved in THF (75 mL). To the solution, diphenylphosphoryl azide (12.9 mL) and 1,8-diazabicyclo[5.4.0]-7-undecene (hereinafter, referred to as DBU) (9.4 mL) were added dropwise at room temperature, and the mixture was stirred at room temperature for 1 hour. To the reaction mixture, brine (100 mL) was added, and the aqueous layer was extracted with ethyl acetate (100 mL×2). The organic layer was washed with brine (100 mL), then dried over anhydrous sodium sulfate, and concentrated under reduced pressure. The residue was purified by silica gel column chromatography (20% ethyl acetate/hexane). The obtained compound was dissolved in THF (80 mL). To the solution, a solution of LAH in THF (2.4 M, 40 mL) was gradually added dropwise at 0° C., and the mixture was stirred at 0° C. for 1 hour. To the reaction mixture, water (5.0 mL) and aqueous sodium hydroxide solution (1.0 M, 5.0 mL) were gradually added dropwise at 0° C. The resultant precipitate was removed by filtration and washed with 10% methanol/THF (200 mL). Then, the combined filtrate was concentrated under reduced pressure. To the residue, brine (100 mL) was added, and the resultant mixture was then extracted with ethyl acetate (150 mL). The organic layer was dried over anhydrous sodium sulfate and concentrated under reduced pressure to obtain the title compound (10.5 g) as a crude product.

Source