Trifluoroacetic acid → 2-(Acetoxymethyl)-5-[[bis(allyloxy)phosphoryl]oxymethyl]benzoic acid

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Reaction Steps

A mixture of 4-methoxybenzyl 2-(acetoxymethyl)-5-[[bis(allyloxy)phosphoryl]oxymethyl]benzoate (590.3 mg, 1.17 mmol) obtained from Example 1-(10) and anisole (600 mg, 5.55 mmol) was cooled to 0° C., and then trifluoroacetic acid (2 ml) was added thereto with stirring. The mixture was warmed to room temperature and allowed to stand for 20 minutes. The mixture was diluted with toluene and was concentrated under reduced pressure to eliminate the volatile components (repeated three times), and an aqueous solution of sodium hydrogen carbonate was added thereto, then the aqueous layer was washed with ethyl acetate. To the aqueous layer was added carefully a 2N aqueous solution of hydrochloric acid (10 ml), and the liberated carboxylic acid was extracted with ethyl acetate. The extract was washed with a saturated aqueous solution of sodium chloride, and the solvent was distilled off under reduced pressure to afford the title compound (477.5 mg, quantitative yield) as a colorless oil.

Provenance & Evidence