Chlorotrimethylsilane → Diethyl [2-(2-Fluorophenyl)-2-oxoethyl]phosphonate

To a solution of 2.34 g (11.9 mmol) of diethylphosphonoacetic acid in toluene at 0° C. was added 4.82 g (47.7 mmol) of triethylamine followed by 1.94 g (17.9 mmol) of chlorotrimethylsilane. The mixture was stirred at ambient temperature for 1 hour, then 1.13 g (11.9 mmol) of magnesium chloride was added and the mixture was stirred for a further 1 hour. To the mixture was added 2.0 g (14.3 mmol) of 2-fluorobenzoyl chloride and the mixture was stirred for 72 hours. The mixture was partitioned between 200 ml of water and 250 ml, 100 ml of dichloromethane. The combined organic portions were dried (magnesium sulphate), filtered and evaporated. The residue was purified by column chromatography eluting with 3-5% methanol/dichloromethane to give 2.1 g (64%) of [2-(2-fluorophenyl)-2-oxoethyl]phosphonic acid diethyl ester as a colorless oil; MS: m/e 274.9 [M+H]+.

1. stirringthe mixture was stirred for a further 1 hour
2. stirringthe mixture was stirred for 72 hours
3. customThe mixture was partitioned between 200 ml of water and 250 ml, 100 ml of dichloromethane
4. dry with materialThe combined organic portions were dried (magnesium sulphate)
5. filtrationfiltered
6. customevaporated
7. customThe residue was purified by column chromatography
8. washeluting with 3-5% methanol/dichloromethane

ORD-Eintrag

ord-b0e8ef5bf537437c815fb0e222c755ee

Quelldatensatz

uspto-grants-2004_03

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US06703387B2