Azide Ring-Opening/Ring-Closure Reactions and Tele-Substitutions in Vicinal Azidopyrazole-, Pyrrole-, and Indolecarboxaldehydes. -The 5-chloro-4-pyrazolecarboxaldehydes (I) react with an excess of sodium azide to form a mixture of the 4-pyrazolecarbonitriles (II) and the 5-hydroxy derivatives (III). Under similar conditions, the pyrroledicarboxaldehydes (IV) give the hydroxy nitriles (V). The indoles (VI) are converted to the indolecarbonitriles (VII) and the oxoindolecarbonitriles (VIII). -(BECHER, J.; JOERGENSEN, P. L.; PLUTA, K.; KRAKE, N. J.; FAELT-HANSEN, B.; J.
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