Dimethylformamide → 2-Phenoxy-alpha-methoxyiminobenzyl cyanide

Temperatur

0 °C

To 2-phenoxybenzaldoxime (1.07 g, 0.005 mole), was added dried ether (10 ml), and chlorine (0.46 g, 0.0065 mole) was introduced into the mixture below -10° C., followed by stirring at 0° C. for 5 hours. After the completion of the reaction, the reaction mixture was concentrated under reduced pressure, and then, dried methylene chloride (10 ml) and tetraethylammonium cyanide (0.86 g, 0.0055 mole) were added to the resulting residue and the mixture was stirred overnight. After completion of the reaction, water (150 ml) was added to the reaction mixture, which was extracted with methylene chloride, dried over anhydrous magnesium sulfate and purified by silica gel chromatography (ethyl acetate/n-hexane) to obtain crude α-hydroxyimino-2-phenoxyphenylacetonitrile (0.51 g), to which were added dried dimethylformamide (4 ml) and potassium carbonate (0.36 g, 0.0026 mole). Dimethyl sulfate (0.30 g, 0.0024 mole) was further added to the mixture, which was stirred at room temperature for 2 hours. After completion of the reaction, ether (100 ml) was added to the reaction mixture, which was washed twice with water, dried over anhydrous magnesium sulfate and concentrated under reduced pressure. The crude product thus obtained was purified by silica gel chromatography (ethyl acetate/n-hexane) to obtain α-methoxyimino-2-phenoxyphenylacetonitrile (0.21 g, yield: 16.6%) as a colorless oil.

1. additionwas introduced into the mixture below -10° C.
2. customAfter the completion of the reaction
3. concentrationthe reaction mixture was concentrated under reduced pressure
4. stirringthe mixture was stirred overnight
5. additionwas added to the reaction mixture, which
6. extractionwas extracted with methylene chloride
7. dry with materialdried over anhydrous magnesium sulfate
8. custompurified by silica gel chromatography (ethyl acetate/n-hexane)
9. customto obtain crude α-hydroxyimino-2-phenoxyphenylacetonitrile (0.51 g)
10. stirringwas stirred at room temperature for 2 hours
11. additionwas added to the reaction mixture, which
12. washwas washed twice with water
13. dry with materialdried over anhydrous magnesium sulfate
14. concentrationconcentrated under reduced pressure
15. customThe crude product thus obtained
16. customwas purified by silica gel chromatography (ethyl acetate/n-hexane)

ORD-Eintrag

ord-d342924ed2744aaa8a0a46f38168678e

Quelldatensatz

uspto-grants-1997_07

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US05650539