Organocatalytic Enantioselective γ-Aminoalkylation of Unsaturated Ester: Access to Pipecolic Acid Derivatives
摘要:
The direct gamma-carbon functionalization of alpha,beta-unsaturated esters via N-Heterocyclic Carbene (NHC) catalysis is disclosed. This catalytically generated nucleophilic gamma-carbon undergoes highly enantioselective additions to hydrazones. The resulting delta-lactam products can be readily transformed to optically enriched pipecolic acid derivatives.
Cooperative catalysis by carbenes and Lewis acids in a highly stereoselective route to γ-lactams
作者:Dustin E. A. Raup、Benoit Cardinal-David、Dane Holte、Karl A. Scheidt
DOI:10.1038/nchem.727
日期:2010.9
more catalytic cycles operate concurrently to achieve one overall transformation, has great potential in enhancing known reactivity and driving the development of new chemical reactions with high value. In this disclosure, a cooperative N-heterocyclic carbene/Lewis acid catalytic system promotes the addition of homoenolate equivalents to hydrazones, generating highly substituted γ-lactams in moderate