A simple route to γ-carbolines and indolizino[7,6-b]indoles
摘要:
We designed and realized for the first time an approach to indolizino[7,6-b]indoles. This approach is based on the Leuckart-Wallach reaction of 2-(2-oxoalkyl)indoles with formamide followed by Bischler-Napieralski cyclization producing gamma-carbolines. The alkylation of 3-alkyl-gamma-carbolines with phenacyl bromides followed by the treatment of the formed pyridinium salt with base produced the target aromatic tetracyclic system. (C) 2015 Elsevier Ltd. All rights reserved.