Triisopropyl phosphite → 4-Diisopropylphosphonomethyl-2-formylamino-6-methoxy-hex-3-enoic acid ethyl ester

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Reaction Steps

3.38 g (11.0 mmol) of 4-bromomethyl-2-formylamino-6-methoxy-hex-3-enoic acid ethyl ester and 12.0 ml (44 mmol) of triisopropyl phosphite (96%) are heated to 80° and stirred under a pressure of approximately 130 mbar for 18 hours. The excess triisopropyl phosphite is distilled off under reduced pressure and the evaporation residue is purified by chromatography on silica gel with ethyl acetate. 4-diisopropylphosphonomethyl-2-formylamino-6-methoxy-hex-3-enoic acid ethyl ester is obtained in the form of a yellowish oil.

Provenance & Evidence