1,4-Dioxane hydrochloride → 2-{5-chloro-4-[2-fluoro-6-(5-methyl-oxazol-2-yl)-phenylamino]-pyrimidin-2-ylamino}-5-methyl-8,9-dihydro-5H-7-oxa-5-aza-benzocyclohepten-6-one

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To a solution of 2-{5-chloro-4-[2-fluoro-6-(5-methylene-4,5-dihydro-oxazol-2-yl)-phenylamino]-pyrimidin-2-ylamino}-5-methyl-8,9-dihydro-5H-7-oxa-5-aza-benzocyclohepten-6-one (80 mg) in acetonitrile (10 mL) was added 4N HCl/dioxane (0.3 mL). The mixture was stirred for 16 hours, concentrated, and triturated with ethyl ether to provide 66 mg of 2-{5-chloro-4-[2-fluoro-6-(5-methyl-oxazol-2-yl)-phenylamino]-pyrimidin-2-ylamino}-5-methyl-8,9-dihydro-5H-7-oxa-5-aza-benzocyclohepten-6-one as an HCl salt: 1H NMR (300 MHz, CD3OD) δ 8.22 (s, 1H), 7.94 (d, 1H), 7.58 (dd, 1H), 7.42 (t, 1H), 7.22-7.10 (m, 3H), 7.95 (s, 1H), 4.40 (t, 2H), 3.35 (s, 3H), 2.85 (t, 2H), 2.40 (s, 3H); MS (m/e) 495 (M+1).

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