Hydrochloric Acid → N-(2-bromo-4-(1-methylethyl)phenyl)-N-ethyl-4-(1-aminoethyl)-6-methylpyrimidinamine

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Reaction Steps

A mixture of N-(2-bromo-4-(1-methylethyl)phenyl)-N-ethyl-4-acetyl-6-methyl-pyrimidinamine (0.5 g, 1.33 mmol), ammonium acetate (1.1 g, 14 mmol), sodium cyanoborohydride (59 mg, 0.9 mmol) and methanol (5 mL) was stirred at ambient temperature for 90 h. A concentrated HCl solution was added until the solution became acidic (pH=2), then the reaction mixture was concentrated in vacuo. The residue was taken up in water, basified with a concentrated NaOH solution and extracted three times with ether. The combined organic layers were dried over MgSO4, filtered and concentrated in vacuo to give an oil. Column chromatography (ethyl acetate:hexanes::1:1), then chloroform:methanol:NH4OH::95:0.5) gave (1) N-(2-bromo-4-(1-methylethyl)phenyl)-N-ethyl-4-(1-aminothyl)-6-methyl-pyrimidinamine (80 mg, 16% yield, Rf 0.34 (ethyl acetate:hexanes::1:1) and (2) the title product as a brown oil (180 mg, 36% yield, Rf 0.34 (chloroform:methanol:NH4OH:: 95:5:0.5)): NMR (CDCl3, 300 MHz): 7.5 (d, 1H, J=1), 7.2-7.1 (m, 2H), 6.4 (s, 1H), 4.25-4.05 (m, 1H), 3.9-3.65 (m, 2H), 3.0-2.85 (m, 1H), 2.4-2.2 (br m, 3H), 1.9-1.6 (br m, 3H), 1.3 (d, 6H, J=8), 1.2 (t, 3H, J=8); CI-HRMS (C18H25BrN4): 377.1341 (M+H), Found: 377.1330.

Provenance & Evidence