Intramolecular cycloadditions of nitrones derived from optically active 1-alkenyl-2-imidazolecarbaldehydes: regio- and diastereoselectivity
作者:Egle Beccalli、Gianluigi Broggini、Alessandro Contini、Ivan De Marchi、Gaetano Zecchi、Caterina Zoni
DOI:10.1016/j.tetasy.2004.07.065
日期:2004.10
Enantiopure polyfunctionalized imidazo[1,2-a]pyridines and pyrrolo[1,2-a]imidazoles, two classes of heterocyclic compounds including anti-inflammatories and glycosidase inhibitors, were synthesized starting from natural alpha-aminoacids and exploiting an intramolecular nitrone cycloaddition as the key step. The regiochemistry of the cycloaddition, which determines the product distribution, was markedly dependent on the R substituent and, therefore, submitted to a theoretical study by means of ab initio and MP2 calculations. (C) 2004 Elsevier Ltd. All rights reserved.