Switching the Stereochemical Outcome of 6-<i>Endo</i>-<i>Trig</i> Cyclizations; Synthesis of 2,6-<i>Cis</i>-6-Substituted 4-Oxopipecolic Acids
作者:Mark Daly、Alastair A. Cant、Lindsay S. Fowler、Graham L. Simpson、Hans Martin Senn、Andrew Sutherland
DOI:10.1021/jo3022583
日期:2012.11.16
A base-mediated 6-endo-trig cyclization of readily accessible enone-derived α-aminoacids has been developed for the direct synthesis of novel 2,6-cis-6-substituted-4-oxo-l-pipecolic acids. A range of aliphatic and aryl side chains were tolerated by this mild procedure to give the target compounds in good overall yields. Molecular modeling of the 6-endo-trig cyclization allowed some insight as to how