A highly enantioselective polycyclization method has been developed using the combination of Lewis acid activation with iridium-catalyzed allylic substitution. This strategy relies on direct use of branched, racemic allylic alcohols and furnishes a diverse and unique set of carbo- and heteropolycyclic ring systems in good yields and >= 99% ee.
Synthesis of vinylindoles and vinylpyrroles by the Peterson olefination or by use of the Nysted reagent
作者:Wayland E. Noland、Christopher L. Etienne、Nicholas P. Lanzatella
DOI:10.1002/jhet.313
日期:2011.3
Vinylindoles and vinylpyrroles were prepared from their corresponding aldehydes or ketones using the Peterson olefination, or by use of the Nysted reagent, a commercially available gem‐dimetallic compound. The two methods provide efficient and convenient access to these useful heterocyclic 1,3‐diene systems. J. Heterocyclic Chem., (2011).