960化工网
Fast racemisation and slow epimerisation of laterally lithiated amides: stereochemical evidence for the mechanism of inversion of amide-substituted benzyllithiums
Jonathan Clayden,Christopher C. Stimson,Martine Keenan,Andrew E. H. Wheatley
Chemical Communications Pub Date : 12/05/2003 00:00:00 , DOI:10.1039/B310963A
Abstract

Tertiary 1-naphthamides racemise much more slowly than their laterally lithiated derivatives, and the relative rates of racemisation and epimerisation of these derivatives indicate that the lithium-bearing stereogenic centre inverts via a “conducted tour” mechanism, in which the lithium cation is delivered from one face to the other by coordination to the rotating amide group.

Graphical abstract: Fast racemisation and slow epimerisation of laterally lithiated amides: stereochemical evidence for the mechanism of inversion of amide-substituted benzyllithiums
平台客服
平台客服
平台在线客服