Enantioselective Intramolecular Aza-Michael Additions of Indoles Catalyzed by Chiral Phosphoric Acids
作者:Quan Cai、Chao Zheng、Shu-Li You
DOI:10.1002/anie.201003919
日期:2010.11.8
Two ways to win: The title reaction has been realized using chiralphosphoricacid catalysts to provide the heterocyclic products in excellent yields and with high ee values. The polycyclic indoles were also constructed using an olefin cross‐metathesis/intramolecular aza‐Michael addition sequence.
Intramolecular Dipolar Cycloaddition Reactions to Give Substituted Indoles – A Formal Synthesis of Deethylibophyllidine
作者:Iain Coldham、Benjamin C. Dobson、Stephen R. Fletcher、Andrew I. Franklin
DOI:10.1002/ejoc.200700045
日期:2007.6
alkaloids is described using stereoselective dipolar cycloaddition reactions of azomethine ylides. The ylides were derivedfrom N-protected 2-butenylindole-3-carbaldehydes, which were prepared in three steps from 2-methylindole. Condensation of these aldehydes with a variety of alkylamino esters or amino acids or with N-methylhydroxylamine gave the required azomethine ylides or nitrone that undergo intramolecular
Synthesis of tetracyclic indole-containing ring systems by intramolecular cycloadditions of azomethine ylides
作者:Iain Coldham、Benjamin C. Dobson、Andrew I. Franklin、Stephen R. Fletcher
DOI:10.1016/j.tetlet.2006.11.130
日期:2007.1
Dipolar cycloaddition of azomethine ylides derived from addition of amines to a 2-butenylindole-3-carboxaldehyde provides a stereoselective synthesis of tetracyclic products present in a variety of indole alkaloids. The chemistry was applied to a formal synthesis of the iboga alkaloid deethylibophyllidine.