Dimethylformamide → (4-{[6-Amino-1-cyclopropylmethyl-3-(2-fluoro-benzyl)-2,4-dioxo-1,2,3,4-tetrahydro-pyrimidin-5-ylcarbamoyl]-methyl}-phenyl)-carbamic acid tert-butyl ester

Participants

Reaction Conditions

Reaction Steps

A solution of (4-{[6-amino-3-(2-fluoro-benzyl)-2,4-dioxo-1,2,3,4-tetrahydro-pyrimidin-5-ylcarbamoyl]-methyl}-phenyl)-carbamic acid tert-butyl ester in N,N-dimethylformamide (2.5 g, 5.17 mmol) at 25° C. under argon was treated with potassium carbonate (6.43 g, 46.53 mmol) followed by cyclopropyl methyl bromide (752 mg, 7.76 mmol). The suspension was stirred at 25° C. overnight. At this time, the reaction was concentrated in vacuo. The residue was diluted with a solution of water (100 mL) and a 1.0N aqueous hydrochloric acid solution (31 mL). The resulting suspension was diluted with chloroform and neutralized with a 1.0N aqueous hydrochloric acid solution. The layers were separated. The aqueous layer was extracted with chloroform. The organics layers were washed with a saturated aqueous sodium chloride solution, dried over magnesium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230–400 mesh, 97/3 methylene chloride/methanol) afforded (4-{[6-amino-1-cyclopropylmethyl-3-(2-fluoro-benzyl)-2,4-dioxo-1,2,3,4-tetrahydro-pyrimidin-5-ylcarbamoyl]-methyl}-phenyl)-carbamic acid tert-butyl ester (1.45 g, 52%) as an orange foam; EI-HRMS m/e calculated for C28H32FN5O5 (M+) 537.2387. found 537.2387.

Provenance & Evidence