Treatment of 2-acetoxymethylpyrroles with 2-unsubstituted pyrroles in either methanol or acetic acid containing a catalytic quantity ( <0·1 equiv.) of toluene-p-sulphonic acid hydrate, affords high yields of the corresponding pyrromethanes. The reaction in methanol is modified to give an acceptable yield of the tripyrrane (15), a member of a class of compound of current biosynthetic interest.
J. A. S. Cavaleiro, A. M. d'A. Rocha Gonsalves, G. W. Kenner and K. M. Smith, J. Chem. Soc., Perkin Trans. 1, 1973, 2471 DOI: 10.1039/P19730002471
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