1-Phenylpiperazine → HCID 86595633, compound

Participants

Reaction Steps

The resin bound activated ester (intermediate in the preparation of 1-[3-(Isopropylcarbamoyl-methoxy)-benzoyl]-6,7-dimethoxy-isoquinoline-4-carboxylic acid; compound with trifluoro-acetic acid (Example 37)) (225 mg, 0.19 mmol) was combined with 3 ml of methylene chloride and 0.060 ml of N-phenylpiperazine (0.388 mmol). The mixture was shaken for 15 minutes under argon at room temperature. The mixture was filtered and the filter cake was washed with methylene chloride. The filtrate was evaporated to dryness. The residue was saponified by dissolving in 1 ml of methanol containing 0.5 ml of 1N sodium hydroxide solution and several drops of tetrahydrofuran. The mixture was stirred at room temperature for 4 hrs and then evaporated to dryness. The residue was purified through a reverse phase preparative HPLC to give 6,7-Dimethoxy-1-{3-[2-oxo-2-(4-phenyl-piperazin-1-yl)-ethoxy]-benzoyl}-isoquinoline-4-carboxylic acid; compound with trifluoro-acetic acid, as a fluffy solid (30 mg).

Provenance & Evidence