Asymmetric Access to the Smallest Enolate Intermediate via Organocatalytic Activation of Acetic Ester
摘要:
An NHC-catalyzed activation of acetic esters to afford enolate intermediates is disclosed. The catalytically generated triazolium enolate intermediates serve as two-carbon nucleophiles that undergo highly enantioselective reactions with enones and alpha,beta-unsaturated imines to give a-unsubstituted delta-lactones and lactams, respectively.
Enantioselective N-Heterocyclic Carbene-Catalyzed [3+3] Annulation of α,β-Unsaturated Esters with Methyl Ketoimine
作者:Wenjing Xia、Hong Yao、Dan Liu、Linxiang Zhao、Yu Zhou、Hong Liu
DOI:10.1002/adsc.201600136
日期:2016.6.2
carbene (NHC)‐catalyzed [3+3] annulation of challenging esters with methyl ketoimines for the highly enantioselective synthesis of intriguing δ‐lactams featuring various substituent patterns. The annulation occurs under mild conditions and offers good tolerance, good yields and excellent enantioselectivities. The six‐membered heterocyclic products are valuable for the synthesis of bioactive molecules
Asymmetric Access to the Smallest Enolate Intermediate via Organocatalytic Activation of Acetic Ester
作者:Shaojin Chen、Lin Hao、Yuexia Zhang、Bhoopendra Tiwari、Yonggui Robin Chi
DOI:10.1021/ol402877n
日期:2013.11.15
An NHC-catalyzed activation of acetic esters to afford enolate intermediates is disclosed. The catalytically generated triazolium enolate intermediates serve as two-carbon nucleophiles that undergo highly enantioselective reactions with enones and alpha,beta-unsaturated imines to give a-unsubstituted delta-lactones and lactams, respectively.