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.
An N-Heterocyclic Carbene-Catalyzed Oxidative γ-Aminoalkylation of Saturated Carboxylic Acids through in Situ Activation Strategy: Access to δ-Lactam
作者:Yonglei Que、Yuanwei Xie、Tuanjie Li、Chenxia Yu、Shujiang Tu、Changsheng Yao
DOI:10.1021/acs.orglett.5b03223
日期:2015.12.18
An N-Heterocyclic Carbene (NHC)-catalyzed oxidative formal [4 + 2] annulation of acylhydrazones with saturatedcarboxylicacids bearing γ-H to assemble δ-lactams featuring a chiral carbon stereogenic center was developed through an in situactivationstrategy. The ready availability of the starting materials, excellent enantioselectivity, facile assembly, high yields, and potential biological significance