Abstract
A short synthetic method for 3-substituted 9H-pyrido[3,4-b]indoles 3 and isoquinolines 7 is proposed using cycloaddition-elimination reactions between 3H-pyrano[3,4-b]indol-3-ones 1 or 3H-2-benzopyran-3-ones 6 and electron-poor nitriles as ethyl cyanoformate and p-toluenesulfonyl cyanide. Extension of the method is possible neither with benzoyl cyanide nor with imines. The diene system undergoes cycloaddition with the carbonyl function of the former compound
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