A General Approach to Aza-Heterocycles by Means of Domino Sequences Driven by Hydroformylation
作者:Etienne Airiau、Thomas Spangenberg、Nicolas Girard、Angèle Schoenfelder、Jessica Salvadori、Maurizio Taddei、André Mann
DOI:10.1002/chem.200801795
日期:2008.12.8
The development of hydroformylative domino reactions of easily accessible vinyl acetamides is described. Extremely regioselective hydroformylation of terminal double bounds provides a transient N-acyliminium that can be trapped by various nucleophiles to give several aza-heterocylic scaffolds in a diastereoselective manner.
Isoindoloisoquinalinone, pyrroloisoquinolinone and benzo[a]quinolizinone units are constructed via intramolecular cyclization of the methoxy substituted N-phenethylimides using BBr3.
A multicomponent reaction between H-2, CO, an unsaturated carboxylic acid derivative, and binucleophiles has been discovered, This process represents a combination of diversity-oriented synthesis and multicomponent reactions including amidation and hydroformylation, followed by nucleophilic addition to an N-acyliminium ion allowing the generation of six new bonds. Using pi-nucleophiles, the sequence turns into a multicomponent Pictet-Spengler reaction.