Chloroacetyl chloride → {(R)-2-[5-(2-chloro-acetylamino)-3-(2,6-difluoro-benzyl)-2,6-dioxo-3,6-dihydro-2H-pyrimidin-1-yl]-1-phenyl-ethyl}-carbamic acid tert-butyl ester

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Reaction Steps

To a solution of {(R)-2-[5-amino-3-(2,6-difluoro-benzyl)-2,6-dioxo-3,6-dihydro-2H-pyrimidin-1-yl]-1-phenyl-ethyl}-carbamic acid tert-butyl ester (50 mg, 0.11 mmol) in dichloromethane (2 mL) were added triethylamine (29 μl, 0.22 mmol) and chloro-acetyl chloride (9.3 μl, 0.12 mmol) in that order, followed by stirring at room temperature for 2 hrs. Again, chloro-acetyl chloride (5.0 μl, 0.06 mmol) was added to the solution which was then stirred at room temperature for 1 hr. The solution was washed with an aqueous saturated sodium bicarbonate solution to separate an organic layer which was then concentrated. The residue was purified using silica gel chromatography (eluent: hexane/ethyl acetate, 2/1) and dried in a vacuum to afford 44 mg of the compound as a colorless oil (yield 76%).

Provenance & Evidence