1-Ethyl-propyl[6-methyl-3-nitro-2-(4-chloro-2,6-dimethyl-phenoxy)-pyridin-4-yl]-amine → 2-(2,6-Dimethyl-phenoxy)-N4-(1-ethyl-propyl)-6-methyl-pyridine-3,4-diamine

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A mixture of (1-ethyl-propyl)-[6-methyl-3-nitro-2-(4-chloro-2,6-dimethyl-phenoxy)-pyridin-4-yl]-amine (800 mg, 2.12 mmol) and 160 mg of 10% Pd/C in 150 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 purple glass form (810 mg) which was purified through silica gel column chromatography using 1:1 chloroform:hexane as eluent to give the title compound as tan crystals (360 mg), mp 98-100° C. 1H NMR (CDCl3) δ 7.05 (m, 3H), 6.11 (s, 1H), 4.00 (brs, 1H), 3.28 (m, 1H), 3.09 (brs, 2H), 2.14 (s, 9H), 1.45-1.75 (m, 4H), 0.98 (t, 6H) ppm. The corresponding HCl salt was prepared as white solid, mp 158-162° C., 1H NMR (D2O) δ 7.27 (s, 3H), 6.67 (s, 1H), 3.65 (m, 1H), 2.27 (s, 3H), 2.16 (s, 6H), 1.45-1.80 (m, 4H), 0.93 (t, 6H) ppm.

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