Triethyl phosphite → 8-(N-benzyloxycarbonylamino)-4-diethylphosphonomethyl-2-formylamino-oct-3-enoic acid methyl ester

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Reaction Steps

5 ml of triethyl phosphite are added to 1.45 g (3.3 mmol) of 8-(N-benzyloxycarbonylamino)-4-bromomethyl-2-formylamino-oct-3-enoic acid methyl ester, and the mixture is heated at 75° for 8 hours with stirring. The excess triethyl phosphite is distilled off under reduced pressure to give an oily residue which is purified by chromatography on a silica gel column with first ethyl acetate and then ethyl acetate/methanol (9:1). 8-(N-benzyloxycarbonylamino)-4-diethylphosphonomethyl-2-formylamino-oct-3-enoic acid methyl ester is obtained.

Provenance & Evidence