Synthesis and Reactions of Isoquinoline Derivatives II.1Synthesis of 3-Chloroisoquinoline-4-aldehydes

Abstract
1-Aryl-substituted 1,4-dihydro-3(2H)isoquinolinones 1 are easily converted to 1-aryl-3-chloroisoquinoline-4-aldehydes 3 by a two-step procedure involving a Vilsmeier-Haack reaction followed by subsequent oxidation with potassium permanganate under acidic conditions.

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