1-(1-Ethylpiperazin-4-yl)-3-bromoisoquinoline → HCID 22503313, compound

Participants

Reaction Steps

(4-Tributylstannylphenyl)(3-benzyloxypropyl)sulfone (5.78 g) and 3-bromo-1-(4-ethylpiperazin-1-yl)isoquinoline (2.13 g) were heated under reflux in the presence of tetrakistriphenylphosphinepalladium(0) (0.58 g) in xylene in nitrogen atmosphere for 7 hr. After cooling, the reaction solution was diluted with ethyl acetate and filtered. The filtrate was extracted with 2N hydrochloric acid, and the resulting aqueous layer was washed with ethyl acetate and adjusted to pH 10 with a 8N aqueous solution of sodium hydroxide, which was then extracted with ethyl acetate. The extract was washed with a 10% aqueous solution of sodium carbonate and brine, and dried over magnesium sulfate. The solvent was evaporated, and the resulting residue was purified by silica gel column chromatography (chloroform/methanol system), to give 1-(4-ethylpiperazin-1-yl)-3-[4-(3-benzyloxypropyl)sulfonylphenyl]isoquinoline (2.56 g) as a pale brown amorphous.

Provenance & Evidence