Enantioselective Activation of Stable Carboxylate Esters as Enolate Equivalents <i>via</i> N-Heterocyclic Carbene Catalysts
作者:Lin Hao、Yu Du、Hui Lv、Xingkuan Chen、Huishen Jiang、Yaling Shao、Yonggui Robin Chi
DOI:10.1021/ol300676w
日期:2012.4.20
The first N-Heterocyclic Carbene (NHC) mediated activation of stable carboxylate esters to generate enolate intermediates is disclosed. The catalytically generated arylacetic ester enolates undergo enantioselective reactions with α,β-unsaturated imines.
Sterically and Temperature Controlled Divergent Cycloadditions of α,β‐Unsaturated Imines with Vinylethylene Carbonates: Insights from Experimental and DFT Studies
作者:Xiaolong Xie、Dandan Yuan、Ben Ma、Jiaming Jin、Enpeng Wang、Wenyi Zhou、Yaowen Hu、Lihong Hu、Junwei Wang
DOI:10.1002/adsc.202101423
日期:2022.3.15
Divergent synthesis of heterocycles with controllable ring sizes from the same starting materials is a long-standing challenge. We report herein the first example of controllable divergent [4+5] and [2+3] cycloadditions of α,β-unsaturatedimines and vinylethylene carbonates, which enables the selectively synthesis of nine-membered and different five-membered heterocycles by controlling the reaction