Phosphorus oxychloride → 4-[(1,7-Dichloro-3-isoquinolinyl)methylamino]phenol

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Reaction Steps

A mixture of 4-[N-(7-chloro-1-hydroxyisoquinolin-3-yl)-N-methylamino]phenol (4.0 g) and phosphorus oxychloride was heated under reflux for approximately 10 minutes at which stage a clear solution had been obtained. The mixture was cooled and poured into ice-water. The precipitated solid was collected and purified by column chromatography over silica gel (eluant dichloromethane/ethyl acetate; 90:10) to give 4-[N-(1,7-dichloroisoquinolin-3-yl)-N-methylamino]phenol (2.57 g) as a yellow crystalline solid mp 124° C.

Provenance & Evidence