Triethylamine → HCID 67062983, compound

Participants

Reaction Conditions

Reaction Steps

To a solution of diphosgene (0.85 mL, 7.2 mmol) in anhydrous dioxane (20 mL) was added a solution of 5-((4-fluoro-2-methyl-5-nitrophenylamino)methyl)-N-methyl-2-(methylthio)pyrimidin-4-amine (2.2 g, 6.5 mmol) and Et3N (1.32 g, 13 mmol) in anhydrous dioxane (50 ml) at 0° C. After the addition, the resulting mixture was stirred at 50° C. overnight. Water was added and the mixture was neutralized with saturated Na2CO3 solution to pH 8. The dioxane was removed in vacuo, and the aqueous layer was extracted with EtOAc (3×60 mL). The combined organics were washed with brine, dried (Na2SO4) and concentrated. The residue was washed with ether and dried in vacuo to afford 3-(4-fluoro-2-methyl-5-nitrophenyl)-1-methyl-7-(methylthio)-3,4-dihydropyrimido[4,5-d]pyrimidin-2(1H)-one (2 g, 84%). 1H NMR (400 MHz, CDCl3): δ 8.04 (s, 1 H), 7.97 (d, J=8 Hz, 1 H), 7.18 (d, J=12 Hz, 1 H), 4.73 (d, J=14.8 Hz, 1 H), 4.42 (d, J=14.8 Hz, 1 H), 3.40 (s, 3 H), 2.52 (s, 3 H), 2.25 (s, 3 H); MS (ESI) m/z: 364.1 [M+H]+.

Provenance & Evidence