Ethylamine → 6-Chloro-N-ethyl-5-nitro-2-(trifluoromethyl)pyrimidin-4-amine

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Reaction Steps

5.25 g (0.02 mol) of 4,6-dichloro-5-nitro-2-trifluoromethyl-pyrimidine are dissolved in 100 ml of abs. ethanol and the solution is cooled to -30° C. At this temperature, 2.0 g (0.02 mol) of triethylamine and 0.9 g (0.2 mol) of ethylamine are added. The mixture is stirred first for 4 hours at -20° C to -30° C and then for 6 hours at 0° C. After it has been left to stand overnight at 20° C, the reaction mixture is concentrated to dryness. The residue is taken up in ether and the solution washed with water. The ethereal phase is dried and concentrated to yield 5.3 g of 4-ethylamino-6-chloro-5-nitro-2-trifluoromethyl-pyrimidine as a pale yellow oil; nD20 = 1.4985.

Provenance & Evidence