Triethylamine → 2-(Dimethylphosphonomethylamino)-3-(4-biphenylyl)-propionic acid

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Reaction Steps

To a stirred suspension of 4-biphenyl-pyruvic acid in anhydrous THF-EtOH (50 mL, 9:1) is added aminomethylphosphonic acid dimethyl ester (520 mg, 3.7 mmol) in THF-EtOH (5 mL, 9:1). The pH is then adjusted with triethylamine to 6.6. After 20 minutes, sodium cyanoborohydride (100 mg, 1.6 mmol) in THF (2.5 mL) is added over 30 minutes. The solution is stirred for 18 hours and then concentrated. Ether (20 mL) is added and the mixture is cooled and treated with 1N HCl (7 mL). After stirring at room temperature for 30 minutes, the solid is filtered off and washed with ether and water to yield 2-(dimethylphosphonomethylamino)-3-(4-biphenylyl)-propionic acid as a waxy solid.

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