Pyrazole → HCID 66759809, compound

Participants

Reaction Conditions

Reaction Steps

60% sodium hydride (91 mg, 2.27 mmol) was added to a solution of DMF (2 mL) containing pyrazole (155 mg, 2.27 mmol) under ice-cooling condition, and the mixture was stirred at 0° C. for 20 minutes. After that, a solution of DMF (1.5 mL) containing 5-bromo-2-(iodomethyl)-2,4,6,7-tetramethyl-2,3-dihydro-1-benzofuran (300 mg, 0.759 mmol) synthesized in Reference Example 133 was added thereto, and the mixture was stirred at 100° C. for 4 hours and at 120° C. for 2 hours. After cooled to room temperature, the reaction solution was distributed using a saturated ammonium chloride aqueous solution and ethyl acetate. The organic layer was washed with saturated saline, and dried using anhydrous magnesium sulfate, followed by concentration under reduced pressure. The residue was purified by silica gel chromatography (hexane-ethyl acetate 95:5-85:15) to give 185 mg of the title compound (yield: 71%).

Provenance & Evidence