3H-Indolium Salts Efficiently Prepared from N-Substituted Anilines and α-Branched Ketones by a One-Pot Synthesis.

3H-indolium salts efficiently prepared f

3H-indolium salts efficiently prepared from N-substituted anilines and α-branched ketones by an one-pot synthesis

✍ Thomas Zimmermann; Ortwin Brede 📂 Article 📅 2004 🏛 Journal of Heterocyclic Chemistry 🌐 English ⚖ 361 KB

## Abstract Starting with the __N__‐substituted anilines 4/12 and the α‐branched ketones 3 the 3__H__‐indolium salts 1 and their fused derivatives 13 are prepared by combining a sodium nitrite nitrosation, a zinc dust reduction, a hydrazone formation and a Fischer indolization to a reaction sequenc