Bromine → 5-Bromopyrimidine-2,4-diamine

Temperatur

25 °C

To a stirring mixture of 2,4-diaminopyrimidine (25 g, 0.23 mol, 1.0 eq) in acetic acid (375 ml) was added Br2 (36.3 g, 0.23 mol, 1.0 eq) at room temperature. The resulting mixture was stirred at room temperature (about 25° C.) for 2 hours and then filtered. The yellow solid was mixed with water (250 ml) and the pH of the resulting mixture was adjusted to 8-9 using 50% NaOH solution. Stirring was continued at room temperature for 30 min and the mixture was filtered, washed with water, and then dried under vacuum to give 38 g (87%) of 2,4-diamino-5-bromo-pyrimidine as a white solid. 1H NMR (400 MHz, d6-DMSO) δ 6.06 (s, 2H, ex. D2O), 6.50 (br, 2H, ex. D2O), 7.76 (s, 1H); MS (+)-ES [M+H]+ m/z 191.

1. filtrationfiltered
2. additionThe yellow solid was mixed with water (250 ml)
3. stirringStirring
4. waitwas continued at room temperature for 30 min
5. filtrationthe mixture was filtered
6. washwashed with water
7. customdried under vacuum

ORD-Eintrag

ord-5144c534da7d4a338d019d19846c1972

Quelldatensatz

uspto-grants-2010_08

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US07781581B2