(1-Ethyl-propyl)-[6-methyl-3-nitro-2-(2,4,6-trimethyl-phenoxy)-pyridin-4-yl]-amine → 2-(2,4,6-trimethylphenoxy)-N4-(1-ethylpropyl)-6-methyl-pyridine-3,4-diamine

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A mixture of (1-ethyl-propyl)-[6-methyl-3-nitro-2-(2,4,6-trimethyl-phenoxy)-pyridin-4-yl]-amine (40 mg, 0.112 mmol) and 4 mg of 10% Pd/C in 10 ml of ethanol was hydrogenated at 50 psi overnight. The mixture was filtered through Celite™ and the filtrate was concentrated to dryness to give a light brown crystals which were purified through silica gel column chromatography using 1:1 chloroform:hexane as eluent to give the title compound as golden crystals (36 mg, 97%), mp 105-107° C. 1H NMR (CDCl3) δ 6.88 (s, 2H), 6.11 (s, 1H), 4.00 (brs, 1H), 3.28 (m, 1H), 3.10 (brs, 2H), 2.31 (s, 3H), 2.16 (s, 3H), 2.10 (s, 6H), 1.45-1.75 (m, 4H), 0.98 (t, 6H) ppm. The corresponding HCl salt was prepared as white solid, mp 174-178° C., 1H NMR (D2O) δ 7.09 (s, 2H), 6.63 (s, 1H), 3.65 (m, 1H), 2.31 (s, 3H), 2.25 (s, 3H), 2.11 (s, 6H), 1.45-1.80 (m, 4H), 0.91 (t, 6H) ppm.

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