Hydrochloric Acid → HCID 66642954, compound

Participants

Reaction Steps

To a mixture of 7-amino-4-[3-(4-methylpiperazin-1-yl)propyl]-2H-1,4-benzoxazine-3(4H)-one (Preparation Example 435) (300 mg) and THF (9 mL), gradual dropwise addition of borane-tetrahydrofuran complex (3.0 mL, 1M THF solution) was conducted under ice cooling under an argon atmosphere. After the dropwise addition was completed, the mixture was stirred at room temperature for 1 hour and further stirred at 70° C. for 3 hours. After methanol (10 mL) was gradually added to the reaction liquid under ice cooling, 1M hydrochloric acid (5 mL) and thereafter 1M aqueous sodium hydroxide (10 mL) were added and stirred at room temperature for 1 hour. After dilution with water, the reaction liquid was extracted with ethyl acetate. After the solvent was distilled off, the residue was purified by silica gel column chromatography (eluent; chloroform:methanol=100:0 to 20:1) to give 4-[3-(4-methylpiperazin-1-yl)propyl]-3,4-dihydro-2H-1,4-benzoxazine-7-amine (120 mg).

Provenance & Evidence