Iodine → 6-amino-3-benzyl-1-butyl-1H-pyrimidine-2,4-dione

Participants

Reaction Conditions

Reaction Steps

6-Amino-1-butyl-1H-pyrimidine-2,4-dione (1.72 g, 9.4 mmol), 1,1,1,3,3,3-hexamethyldisilazane (30 mL), and ammonium sulfate (0.03 g, 0.2 mmol) were heated under nitrogen at reflux for 24 h. After cooling to room temperature the 1,1,1,3,3,3-hexamethyldisilazane was removed under vacuum to give a light brown oil to which was added benzylbromide (1.1 mL, 1.58 g, 9.2 mmol) and a crystal of iodine. The resulting mixture was heated in a 110° C. oil bath for 1 h. The mixture was cooled in as ice bath while methanol was cautiously added. After concentration and trituration with chloroform and cooling to −20° C. freezer, the solid product was isolated by filtration. This material was passed through a pad of silica gel 60 (35–70 mesh) eluted with 9:1 chloroform/methanol to give 1.0 g of pure 6-amino-3-benzyl-1-butyl-1H-pyrimidine-2,4-dione. LRMS, m/z(M+H)=274.4.

Provenance & Evidence