Diethyl Ether → N-(2-Fluoro-4-{2-[3-methyl-3-(1-methylpiperidin-4-yl)ureido]pyridin-4-yloxy}phenyl)-N'-(4-fluorophenyl)malonamide

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Reaction Steps

To a solution of 3-[4-(4-amino-3-fluorophenoxy)pyridin-2-yl]-1-methyl-1-(1-methylpiperidin-4-yl)urea (40.5 mg) in tetrahydrofuran (20 ml) (Production Example 124) was added N,N-dimethylformamide (2 ml) under a nitrogen atmosphere, followed by evaporating the tetrahydrofuran under a reduced pressure. To the solution thus concentrated were added N-(4-fluorophenyl)malonic acid (42.6 mg), triethylamine (0.030 ml) and (1H-1,2,3-benzotriazol-1-yloxy)[tri(dimethylamino)]phosphonium hexafluorophosphate (95.5 mg) at room temperature, followed by stirring for 1 hr. The reaction mixture was partitioned between ethyl acetate (30 ml) and a saturated aqueous solution of ammonium chloride (15 ml). The organic layer was washed with a saturated aqueous solution of ammonium chloride (15 ml), water (15 ml) and brine (15 ml) in this order, and dried over anhydrous sodium sulfate. The solvent was evaporated to give a residue, which was then purified by silica gel column chromatography (FUJI Silysia NH, eluent; ethyl acetate-ethyl acetate:ethanol=95:5). Fractions containing the target compound were concentrated to give a residue, to which diethyl ether (1 ml) was added to suspend. The solid was filtered off and dried under aeration to provide the titled compound (29.1 mg, 48.8%) as a pale green and yellow solid.

Provenance & Evidence