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Next, 0.64 g (1.19 mmol) of benzyl 2-(N-benzyloxycarbonylamino)-4-[butyl(phenyl)phosphono]butanoate was dissolved in 20 mL of a solvent mixture of methanol and water at 3:1 and mixed with 200 mg of 5% palladium-carbon and hydrogen gas was introduced for 75 minutes. The palladium-carbon was removed by Celite filtration and the filtrate was vacuum-concentrated. The residue was purified by medium pressure reversed-phase column chromatography ODS-S-50B. The column was eluted with a linear gradient of 30 to 60% methanol at a flow rate of 6 mL/min, and the fractions containing the compound eluted at 60% methanol were collected. The elution and purity of the compound were confirmed by TLC (BuOH/AcOH/H2O=5:2:2, ninhydrin coloration). After vacuum concentration, freeze drying was carried out to obtain 2-amino-4-[butyl(phenyl)phosphono]butanoic acid (0.28 g, yield 75%) as a colorless solid.

1. additionwas introduced for 75 minutes
2. customThe palladium-carbon was removed by Celite filtration
3. concentrationthe filtrate was vacuum-concentrated
4. customThe residue was purified by medium pressure reversed-phase column chromatography ODS-S-50B
5. washThe column was eluted with a linear gradient of 30 to 60% methanol at a flow rate of 6 mL/min
6. additionthe fractions containing the compound
7. washeluted at 60% methanol
8. customwere collected
9. washThe elution and purity of the compound
10. concentrationAfter vacuum concentration, freeze
11. customdrying