Reaction #433636

Reaction equation

8-(3-fluoro-benzyloxy)-1,3-dihydro-benzo[d]azepin-2-one

sodium hydride

methyliodide

→

8-(3-fluoro-benzyloxy)-3-methyl-1,3-dihydro-benzo[d]azepin-2-one

Yield 69.0%

Solvents

tetrahydrofurane

Conditions

Workup

1. 1
   workup.WAITThe reaction mixture was left
2. 2
   Temperatureto warm to RT
3. 3
   workup.STIRRINGstirring
4. 4
   workup.WAITcontinued for 90 min
5. 5
   OtherFor completion of the reaction
6. 6
   Temperaturethe mixture was heated to 40° C. during 2 h
7. 7
   Otherthe reaction mixture was evaporated under reduced pressure
8. 8
   workup.DISSOLUTIONThe residue was dissolved in 10 ml of ethylacetate
9. 9
   Extractionthe solution extracted with 4 ml of water
10. 10
    Dryingdried over sodium sulfate
11. 11
    Otherevaporated under reduced pressure
12. 12
    OtherFor purification
13. 13
    Otherthe crude material obtained
14. 14
    Otherwas chromatographed on silica gel using a 2

Procedure

In a dried flask under an inert atmosphere, 70 mg (0.25 mmol) of 8-(3-fluoro-benzyloxy)-1,3-dihydro-benzo[d]azepin-2-one were dissolved in 5 ml of tetrahydrofurane, and the solution cooled to 0° C. Thereupon, 14 mg (0.3 mmol) of sodium hydride (50% in oil) were added and stirring continued at 0° C. for 15 min. Finally, 17 μl (0.3 mmol) of methyliodide were added. The reaction mixture was left to warm to RT and stirring continued for 90 min. For completion of the reaction, the mixture was heated to 40° C. during 2 h. For the working-up, the reaction mixture was evaporated under reduced pressure. The residue was dissolved in 10 ml of ethylacetate, the solution extracted with 4 ml of water, then dried over sodium sulfate and evaporated under reduced pressure. For purification, the crude material obtained was chromatographed on silica gel using a 2:1-mixture of heptane and ethylacetate as the eluent. There were obtained 51 mg (69% of theory) of 8-(3-fluoro-benzyloxy)-3-methyl-1,3-dihydro-benzo[d]azepin-2-one as a yellowish solid; MS: m/e=297 (M)+.

Source