Diethyl methylphosphonite → (4S)-3-benzyloxycarbonyl-4-{2-[ethoxy(methyl)phosphinyl]ethyl}-1,3-oxazolidin-5-one

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5.30 g (16.1 mmol) of (4S)-3-benzyloxycarbonyl-4-(2-bromomethyl)-1,3-oxazolidin-5-one (from Example 5) are mixed with 4.40 g (32.3 mmol) of diethyl methanephosphonite and the mixture is heated under argon for 6 hours at 120° C. The excess diethyl methanephosphonite is distilled off in high vacuum and the residue is purified by chromatography on silica gel (mobile phase: dichloromethane/acetonitrile). 4.64 g (81.1% of theory) of (4S)-3-benzyloxycarbonyl-4-{2-[ethoxy(methyl)phosphinyl]ethyl}-1,3-oxazolidin-5-one are obtained as a colorless oil. Analytical data:

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