Synthesis 1988; 1988(9): 680-683
DOI: 10.1055/s-1988-27669
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Synthesis and Reactions of Isoquinoline Derivatives II.1 Synthesis of 3-Chloroisoquinoline-4-aldehydes

W. Bartmann* , E. Konz, W. Rüger
  • *Hoechst AG, D-6230 Frankfurt/Main 80, Federal Republic of Germany
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Publication History

Publication Date:
18 September 2002 (online)

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.