Phenyl chloroformate → 4-(Azetidin-1-ylmethyl)piperidine-1-carboxylic acid [6-(2-fluoro-4-nitrophenoxy)pyrimidin-4-yl]amide

Participants

Reaction Steps

6-(2-Fluoro-4-nitrophenoxy)pyrimidin-4-ylamine (200 mg) was dissolved in tetrahydrofuran (8 ml) under a nitrogen atmosphere, and then triethylamine (0.335 ml) and phenyl chloroformate (0.300 ml) were added thereto while cooling in an ice water bath, followed by warming to room temperature and stirring for 30 min. The reaction mixture was partitioned between ethyl acetate (50 ml) and a saturated aqueous solution of sodium hydrogencarbonate (30 ml). The organic layer was washed with a saturated aqueous solution of sodium hydrogencarbonate (30 ml), water (30 ml), brine (30 ml) in this order, and dried over anhydrous sodium sulfate. The solvent was evaporated to give a residue, to which was added N,N-dimethylformamide (3 ml). 4-(Azetidin-1-ylmethyl)piperidine dihydrochloride (600 mg) and triethylamine (0.781 ml) were added thereto, followed by stirring for 7 hrs. The reaction mixture was partitioned between ethyl acetate (100 ml) and a saturated aqueous solution of ammonium chloride (50 ml). The organic layer was washed with a saturated aqueous solution of ammonium chloride (50 ml), water (50 ml), and brine (50 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, heptane:ethyl acetate=1:8, then ethyl acetate). Fractions containing the target compound were concentrated to provide a crude product of the titled compound (340 mg) as a pale yellow oil.

Provenance & Evidence