All articles of this category 1-Acetyl-3-oxo-2,3-dihydroindoles were reacted with substituted benzaldehydes affording 1-acetyl-2-arylmethylene-3-oxo-2,3-dihydroindoles which were selectively reduced by hydrogen; then a Horner-Emmons reaction gave the precursors of 2-substituted tryptamines. Nitromethane was added to 1-acetyl-2-arylmethylene-3-oxo-2,3-dihydroindoles giving Michael addition products.
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BUZAS et al. (1989) studied this question.