p-Toluenesulfonyl azide → (1E)-1-diazo-1-dimethoxyphosphorylpropan-2-one

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Reaction Steps

To a suspension of NaH (60% in mineral oil, 0.83 g, 20.8 mmols) in THF (50 ml) was added dropwise at 0 C (2-oxo-propyl)-phosphonic acid dimethyl ester (3.1 g, 18.7 mmols) in THF (50 ml), and the solution was stirred at 0 C for one hour. Tosyl azide (4 g, 20 mmols) was added in one portion, stirred at 0 C for 10 minutes, filtered through Celite and concentrated. The residue was purified by column chromatography on silica gel using ethyl acetate to yield the title compound (2.9 g, 81%) as oil. (Eur. J. Org. Chem. 2003, 821-832.)

Provenance & Evidence