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.
![Graphical abstract: Efficient synthesis of functionalized 3H-pyrrolo[1,2-a]indoles](/en/Image/Get?imageInfo.ImageType=GA&imageInfo.ImageIdentifier.ManuscriptID=B204433C&imageInfo.ImageIdentifier.Year=2002)
I. Yavari, M. Adib and M. H. Sayahi, J. Chem. Soc., Perkin Trans. 1, 2002, 1517 DOI: 10.1039/B204433C
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