1H-Pyrazol-3-amine, 5-methyl- → 2,6-dichloro-5-fluoro-N-(5-methyl-1H-pyrazol-3-yl)pyrimidin-4-amine

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Reaction Steps

To a solution of 2,4,6-trichloro-5-fluoropyrimidine (4.03 g) in absolute ethanol (100 mL) was added DIEPA (5.3 mL) and 5-methyl-1H-pyrazol-3-amine (2.03 g). The resulting solution was stirred at room temperature for 6 hours. The precipitation was filtered and washed with cold ethanol. The compound was dried by vacuum oven give 2,6-dichloro-5-fluoro-N-(5-methyl-1H-pyrazol-3-yl)pyrimidin-4-amine as solid (3.7 g). m/z 262. A mixture of morpholine (0.181 mL), 2,6-dichloro-5-fluoro-N-(5-methyl-1H-pyrazol-3-yl)pyrimidin-4-amine (500 mg) and DIPEA (0.505 ml) in absolute ethanol (10.0 ml) was heated at 80° C. for 5 hours. The solvent was removed under reduced pressure and the residue was purified by Gilson (10-50% MeCN/H2O, 15 minutes) to give the titled compound as solid (236 mg). 1H NMR δ 12.05 (bs, 1H) 9.57 (s, 1H) 6.21 (s, 1H) 3.67 (t, 4H) 3.57 (t, 4H) 2.22 (s, 3H); m/z 313.

Provenance & Evidence