New Synthetic Protocols for the Preparation of Unsymmetrical Bisindoles
摘要:
Novel unsymmetrical bisindoles were synthesized by a solvent-free C-C bond-formation reaction under mild conditions. Starting from aziridines or hydroxyl precursors, indoles have been used as C-nucleophiles to form new pharmacologically interesting bisindoles via an electrophilic aromatic substitution pathway in good to excellent yields.
Preparation of Novel Unsymmetrical Bisindoles under Solvent-Free Conditions: Synthesis, Crystal Structures, and Mechanistic Aspects
作者:Hanns Martin Kaiser、Ivo Zenz、Wei Fun Lo、Anke Spannenberg、Kristin Schröder、Haijun Jiao、Dirk Gördes、Matthias Beller、Man Kin Tse
DOI:10.1021/jo7016026
日期:2007.11.1
O-nucleophiles demonstrate their versatility as key intermediates in diversity oriented synthesis. The hydroxyl precursor leads also to unsymmetrical bisindoles under similar reaction conditions. Important intermediates and final library compounds were confirmed by X-ray analysis. Theoretical studies on these systems show the possible cationic intermediate in the substitution pathway.