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Variously substituted 2‐vinylpyrroles underwent an endo‐addition [4+2] cycloaddition reaction with maleimides followed by a spontaneous highly diastereoselective (93–98% de) isomerization to give tetrahydroindoles in moderate to excellent yield. Treatment with activated MnO2 in refluxing toluene provided the corresponding indoles in moderate to good yield. This highly convergent methodology for formation of indoles is versatile and the starting materials are conveniently prepared. J. Heterocyclic Chem., (2009).

Two new polymorphs of 2,4,6-tri­bromo­benzo­nitrile have been found. Together with the known polymorph, they are polytypic. One new polytype is isostructural with the previously reported crystal structure of 1,3,5-tri­bromo-2-iso­cyano­benzene.

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