Lewis acid-mediated cyclizations of (2′-amino-N′-tert-butoxycarbonyl-benzylidene)-3-alkenylamines
作者:Kristine E. Frank、Jeffrey Aubé
DOI:10.1016/s0040-4039(98)01596-2
日期:1998.10
activation, (2′-amino-N′-tert-butoxycarbonyl-benzylidene)-3-alkenylamines (1) react with Lewis acids (TiCl4 or TMSOTf) to afford either a novel Boc-assisted iminium ion formation/trapping sequence (giving hexahydropyrido[1,2-c]quinazolin-6-ones (2) or tetrahydropyrrolo[1,2-c]quinazolin-5-ones (4)) or a pseudodimerization process (leading to iminodibenzo[b,f]diazocines (3)).
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.