Potassium Carbonate → (5R)-3-{6-[(3,3-dimethyl-1,3-dihydro-2-benzofuran-4-yl)oxy]-3-pyridinyl}-5-ethyl-5-methyl-2,4-imidazolidinedione

Participants

Reaction Conditions

Reaction Steps

3,3-Dimethyl-1,3-dihydro-2-benzofuran-4-ol (Intermediate 193, 68 mg, 0.4 mmol) and (5R)-3-(6-chloropyridin-3-yl)-5-ethyl-5-methylimidazolidine-2,4-dione (Intermediate 194, 126 mg, 0.48 mmol) were dissolved in DMF (1.0 mL) and K2CO3 (143 mg, 1.03 mmol) was added. The resulting suspension was heated to 130° C. under microwave irradiation for 40 minutes. The reaction mixture was diluted with water (25 mL) and ethyl acetate (25 mL), and then two phases were separated. The organic layer was washed with water and brine, dried over Na2SO4 and concentrated under vacuum. The residue was purified by flash chromatography (Biotage system) on silica gel using cyclohexane/ethyl acetate 50:50 as eluent affording the title compound (70 mg) as a white solid.

Provenance & Evidence