Sodium Hydroxide → 3-[N-(N-benzyloxycarbonylaminoacetyl)N-hydroxyamino]propylphosphonic acid

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Reaction Steps

A solution of N-benzyloxycarbonylaminoacetyl chloride (2.85 g) in ethyl ether (5 ml) was added dropwise to a solution of 3-(N-hydroxyamino)propylphosphonic acid (985 mg) and sodium bicarbonate (1.51 g) in a mixture of water (20 ml) and methanol (20 ml) with stirring under ice-cooling. During the period, the reaction mixture was adjusted to pH 7-8 with 5% aqueous sodium bicarbonate solution. The stirring was continued for an hour, whereafter the mixture was adjusted to pH 10 with 1 N aqueous sodium hydroxide solution and stirred at the same temperature for 45 minutes. The resultant mixture was adjusted to pH 7 and methanol was distilled off under reduced pressure. The resultant aqueous solution was adjusted to pH 2 with 10% hydrochloric acid and washed with ethyl acetate (30 ml), whereafter the solution was adjusted to pH 1 with 10% hydrochloric acid and then extracted twice with n-butanol (30 ml). The combined n-butanol layer was concentrated under reduced pressure to give a residue, which was crystallized from ether to give 3-[N-(N-benzyloxycarbonylaminoacetyl)N-hydroxyamino]propylphosphonic acid (720 mg) in the form of crystals MP: 101°~105° C.

Provenance & Evidence