Hydrochloric Acid → 8-Hydroxymethyl-7-(2-methoxyphenyl)-3,3-dimethyl-3,4-dihydro-1H-quinoxalin-2-one

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Reaction Conditions

Reaction Steps

Lithium aluminium hydride (26.0 mg, 0.64 mmol) was suspended in anhydrous tetrahydrofuran (0.5 mL) under nitrogen atmosphere. An anhydrous tetrahydrofuran solution (1.5 mL) of 8-methoxycarbonyl-7-(2-methoxyphenyl)-3,3-dimethyl-3,4-dihydro-1H-quinoxalin-2-one (Reference Compound No. 2-1, 108 mg, 0.32 mmol) was added thereto at 0° C., and stirred for 3 hours at the same temperature. After ethyl acetate (3 mL) and water (3 mL) were added dropwise successively, ethyl acetate (30 mL), water (30 mL) and 1N aqueous hydro chloride solution (5 mL) were added thereto, and the mixture was partitioned. After the water layer was extracted with ethyl acetate (20 mL), the organic layer was combined. The organic layer was washed with water (50 mL, 2 times) and saturated brine (50 mL) successively, dried over anhydrous magnesium sulfate, and then the solvent was removed under reduced pressure. The obtained residue was purified by silica gel column chromatography (hexane-ethyl acetate) to give the titled reference compound (61.0 mg) as a pale yellow amorphous product. (Yield 61%)

Provenance & Evidence