Triethylamine → 3-[6-(2-Fluoro-4-nitrophenoxy)pyrimidin-4-yl]-1-(3-diethylaminopropyl)-1-methylurea

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Reaction Steps

6-(2-Fluoro-4-nitrophenoxy)pyrimidin-4-ylamine (50 mg) was dissolved in tetrahydrofuran (2 ml) under a nitrogen atmosphere, and then triethylamine (0.0697 ml) and phenyl chloroformate (0.0627 ml) were added thereto while cooling in an ice bath, followed by stirring at room temperature for 30 min. The reaction mixture was concentrated under a reduced pressure to give a residue, to which N,N-dimethylformamide (2 ml) and N,N-diethyl-N′-methylpropane-1,3-diamine (115 mg) were added, followed by stirring at room temperature for 2 hrs. The reaction mixture was partitioned between ethyl acetate and a saturated aqueous solution of ammonium chloride. The organic layer was washed with a saturated aqueous solution of ammonium chloride, water and brine in this order, and dried over anhydrous sodium sulfate. The solvent was evaporated under a reduced pressure to give a residue, which was then purified by silica gel column chromatography (eluent; hexane:ethyl acetate=2:1 to 1:1, then ethyl acetate:ethanol=19:1). Fractions containing the target compound were concentrated under a reduced pressure to give a residue, which was then dried in vacuum to provide the titled compound (55.7 mg, 66.2%) as a yellow solid.

Provenance & Evidence