Hydrochloric Acid → 1-(4-Ethylpiperazin-1-yl)-3-[4-(2-hydroxyethyl)phenyl]isoquinoline dihydrochloride

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Reaction Steps

The resulting 1-(4-ethylpiperazin-1-yl)-3-[4-(2-benzyloxyethyl)phenyl]isoquinoline (0.46 g) was converted into a hydrochloride in a conventional manner. The resulting hydrochloride was then dissolved in methanol (50 ml), followed by the addition of 10% palladium/carbon catalyst (0.10 g), and the catalytic reduction was conducted at atmospheric pressure overnight. The catalyst was filtered off, while the solvent was evaporated. Water was added thereto, followed by the addition of a 1N aqueous solution of sodium hydroxide to adjust to pH 8, and then the mixture was extracted with ethyl acetate. The extract was washed with brine, dried over magnesium sulfate, and evaporated. The solvent was evaporated, and the resulting residue was purified by silica gel column chromatography (chloroform/methanol system), to give 0.24 g of the free compound of the title compound as a pale brown viscous oil.

Provenance & Evidence