Sodium Hydroxide → HCID 59485093, compound

Participants

Reaction Conditions

Reaction Steps

To the THF (2 ml) solution of lithium aluminum hydride (68 mg, 1.80 mmol), aluminum chloride (240 mg, 1.80 mmol) was added under ice cooling. After stirring for 10 minutes at 0° C., THF (4 ml) solution of 5-[4-(4-methoxyphenyl)piperazin-1-yl]-4,6,7-trimethyl-1-benzofuran-3(2H)-one (220 mg, 0.600 mmol) synthesized in Reference example 109 was added. The mixture was stirred for 3 hours under reflux. After cooling to room temperature, water was added to the reaction solution, and 0.5 N aqueous solution of sodium hydroxide was further added to the reaction solution. The mixture was stirred for 30 minutes at room temperature and extracted with ethyl acetate-diethyl ether (1/1) mixture solvent. The extract solution was washed with saturated brine, dried over anhydrous magnesium sulfate, and then concentrated under reduced pressure. The residue was dissolved in ethyl acetate (20 ml), added with 10%-palladium carbon (comprising 50% moisture, 200 mg), and then the mixture was stirred at 60° C. for 15 hours under hydrogen atmosphere. After cooling to room temperature, palladium carbon was removed by filtration and the filtrate was concentrated under reduced pressure. The residue was purified by silica gel chromatography (hexane-ethyl acetate 95:5-80/20) to obtain the title compound 35 mg (yield 17%).

Provenance & Evidence