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.
Titanocene(II)-promoted alkenylation of functionalized alkynes with (Z)-alkenyl sulfones proceeded with high regio- and stereoselectivity to produce functionalized dienes. Conjugated dienylcarboxylic acids and dienylphosphonic esters were obtained using acetylenic lithium carboxylates and dialkyl phosphonates as starting materials.
Organocatalytic Enantioselective γ-Aminoalkylation of Unsaturated Ester: Access to Pipecolic Acid Derivatives
作者:Jianfeng Xu、Zhichao Jin、Yonggui Robin Chi
DOI:10.1021/ol402358k
日期:2013.10.4
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.