Ammonia → 3-(3,5-dimethyl-4-(2-(4-methylpiperazin-1-yl)ethoxy)phenyl)-6,8-dimethoxyisoquinolin-1(2H)-one

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Reaction Conditions

Reaction Steps

The compound 3-[4-(2-chloro-ethoxy)-3,5-dimethyl-phenyl]-6,8-dimethoxy-isochromen-1-one (298 mg, 0.767 mmol) was dissolved in DMSO (5 mL) and N-methyl piperazine (388 mg, 3.83 mmol) and Et3N (392 mg, 3.83 mmol) were added. The reaction mixture was heated at 110° C. for 16 h before being cooled to room temperature. Water was added and the mixture was extracted with ethyl acetate. The solvent was evaporated in vacuo to leave a residue which was purified by column chromatography. The yield was 60 mg (17%). The compound 3-[3,5-dimethyl-4-(2-(4-methyl piperazin-1-yl-ethoxy)-phenyl]-6,8-dimethoxy-isochromen-1-one (60 mg, 0.13 mmol) and NH3 (2.0 M solution in ethanol, 20 mL) were mixed in a steel bomb and heated at 130° C. for 16 h. The solvent was removed and the crude compound was purified by column chromatography. The compound was then converted to the hydrochloride salt of 3-(3,5-dimethyl-4-(2-(4-methylpiperazin-1-yl)ethoxy)phenyl)-6,8-dimethoxyisoquinolin-1(2H)-one (40 mg, 62%), an off-white solid. Selected data: MS (ES) m/z: 452.1; MP 195-198° C. (HCl salt).

Provenance & Evidence