Diethyl Ether → 1-[1-(2-Dimethylaminoethyl)piperidin-4-yl]-3-[4-(4-{3-[2-(4-fluorophenyl)acetyl]ureido}phenoxy)pyridin-2-yl]-1-methylurea

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Reaction Steps

To a solution of 3-[4-(4-aminophenoxy)-pyridin-2-yl]-1-[1-(2-dimethylaminoethyl)piperidin-4-yl]-1-methylurea (154 mg) in tetrahydrofuran (5.0 ml) was added a solution of 2-(4-fluorophenyl)acetyl isocyanate in tetrahydrofuran (0.25 M, 3.73 ml) at room temperature, followed by stirring at room temperature for 10.5 hrs. The reaction mixture was partitioned between ethyl acetate and a saturated aqueous solution of sodium hydrogencarbonate. The organic layer was washed with brine, and dried over anhydrous sodium sulfate. The organic layer was concentrated to give a residue, which was then purified by silica gel column chromatography (FUJI Silysia NH, eluent; ethyl acetate, then ethyl acetate:methanol=10:1). Fractions containing a target compound were concentrated to give a residue, to which diethyl ether (1 ml) and hexane (1 ml) were added to give a precipitate. The precipitate was filtered off, and dried under aeration to provide the titled compound (29.8 mg, 13.5%) as white powder.

Provenance & Evidence