Intramolecular 1,3-Dipolar Cycloadditions of Sugar Ketonitrones: A Convenient Method for Stereoselective Formation of Nitrogenated Quaternary Centers
作者:S. Torrente、B. Noya、M. D. Paredes、R. Alonso
DOI:10.1021/jo9710893
日期:1997.10.1
Intra- and Intermolecular 1,3-Dipolar Cycloaddition of Sugar Ketonitrones with Mono-, Di-, and Trisubstituted Dipolarophiles
作者:Susana Torrente、Beatriz Noya、Vicenç Branchadell、Ricardo Alonso
DOI:10.1021/jo034159g
日期:2003.6.1
The 1,3-dipolar cycloaddition of sugar ketonitrones is a useful synthetic procedure to build up nitrogenated quaternary centers in terms of scope (substrate, dipolarophile, inter- and intramolecular versions), yield, and regio- and stereoselectivity. The hybrid ONIOM (B3LYP/6-31G(d):AM1) theoretical method followed by single-point energy calculations at the B3LYP/6-31G(d) level adequately perform to