Dialkyl 9-chloro-3H-pyrrolo[1,2-a]indole-2,3-dicarboxylates are obtained in excellent yields from the 1 ∶ 1 ∶ 1 addition reaction between triphenylphosphine, dialkyl acetylenedicarboxylates and 3-chloroindole-2-carbaldehyde; dimethyl 9-chloro-3H-pyrrolo[1,2-a]indole-2,3-dicarboxylate is converted to dimethyl 9-oxo-9H-pyrrolo[1,2-a]indole-2,3-dicarboxylate.
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Yavari et al. (2002) studied this question.
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