Hydrochloric Acid → 1-(6-(3-Chloro-5-fluoro-4-hydroxyphenyl)-4-((6-(3-(methylamino)piperidin-1-yl)pyridin-3-yl)amino)quinolin-3-yl)ethanone trihydrochloride

Participants

Reaction Conditions

Reaction Steps

To a suspension of tert-butyl (1-(5-((3-acetyl-6-bromoquinolin-4-yl)amino)pyridin-2-yl)piperidin-3-yl)(methyl)carbamate (80 mg, 0.144 mmol), 2-chloro-6-fluoro-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenol (68 mg, 0.28 mmol) and Pd(dppf)Cl2 (11 mg, 0.015 mmol) in dioxane (4 mL) was added Cs2CO3 (1.0 M in H2O, 0.4 mL, 0.4 mmol). N2 gas was bubbled through the reaction mixture and the mixture was then heated at 80° C. for 2 h. The solution was allowed to cool to room temperature, diluted with a saturated NaHCO3 solution and extracted with ethyl acetate. The combined organic layers were dried over anhydrous sodium sulfate and concentrated. Purification by column chromatography (silica, 0-20% methanol/dichloromethane) afforded a brown solid. This solid was dissolved in THF (3 mL), water (3 mL) and HCl (6 M in water, 2 mL, 12 mmol). The reaction mixture was heated at 65° C. for 4 h, cooled to room temperature and concentrated. The resultant residue was purified by preparative HPLC (C18 silica, 10-90% acetonitrile/water with 0.05% TFA). The residue was dissolved in methanol (8 mL) and HCl (6 M in water, 1.0 mL, 6 mmol) was added. The resultant solution was concentrated to give the desired product (63.2 mg, 70%) as an orange solid. 1H NMR (500 MHz, MeOD) δ 9.28 (s, 1H), 8.29-8.19 (m, 2H), 8.04-7.96 (m, 2H), 7.78 (d, J=9.5 Hz, 1H), 7.24 (d, J=9.3 Hz, 1H), 7.13-7.06 (m, 2H), 4.46 (br s, 1H), 3.96 (d, J=13.1 Hz, 1H), 3.61 (br s, 1H), 3.48-3.37 (m, 1H), 2.82 (s, 3H), 2.80 (s, 3H), 2.28-2.24 (m, 1H), 2.02-1.94 (m, 1H), 1.88-1.70 (m, 2H). ESI MS m/z 520 [C32H32Cl2N4O2+H]+; HPLC 98.8% (AUC), tR=9.82 min.

Provenance & Evidence