Hydrochloric Acid → (2R,4R)-2-Aminomethyl-4-(2,4-difluoro-benzyl)-hexanoic Acid

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Reaction Conditions

Reaction Steps

A flask was charged with 0.5 g (1.2 mmol) of 2-tert-butyl-5-[2-(2,4-difluoro-benzyl)-butyl]-3-methyl-4-oxo-tetrahydro-pyrimidine-1-carboxylic acid methyl ester, 20 mL of dioxane, and 20 mL of conc. HCl solution. The mixture was stirred and heated at 110° C. for 4 days. The solvents were removed under reduced pressure. The residue was taken up in 20 mL of water and 4 drops of conc. HCl solution. The aqueous layer was washed with dichloromethane. The aqueous layer was collected and the water was removed under reduced pressure. The residue was treated with 2 mL of triethylamine, and the excess triethylamine was removed under reduced pressure. The remaining solid was purified by column chromatography (1:8:27 NH4OH, MeOH, dichloromethane eluent). The resulting white solid was washed with acetonitrile and dried under vacuum. This gave 80 mg (24% yield) of the titled compound as a white solid.

Provenance & Evidence