N,3,4-Trisubstituted pyrrolidines by electron transfer-induced oxidative cyclizations of N-allylic β-amino ester enolates
作者:Ullrich Jahn、František Kafka、Radek Pohl、Peter G. Jones
DOI:10.1016/j.tet.2009.10.034
日期:2009.12
Oxidative radicalcyclizations starting from easily accessible N-allylic β-alanine esters are reported. Deprotonation generates the corresponding enolates, which are transformed efficiently into α-esterradicals by single electron transfer mediated by ferrocenium hexafluorophosphate. The stereochemistry of the radical 5-exo cyclization can be switched by the configuration of the enolate precursor.