Magnesium(<scp>ii</scp>)-catalyzed asymmetric hetero-Diels–Alder reaction of Brassard's dienes with isatins
作者:Jianfeng Zheng、Lili Lin、Yulong Kuang、Jiannan Zhao、Xiaohua Liu、Xiaoming Feng
DOI:10.1039/c3cc47800a
日期:——
The first catalytic asymmetric hetero-Diels-Alder reaction of Brassard's dienes with isatins was realized using Mg(II)/N,N'-dioxide complexes as catalysts, affording the corresponding chiral spirolactones bearing tetrasubstituted centers in up to 99% yield with up to 99% ee and >99 : 1 dr within 3 hours. In the mechanism, based on the operando IR experiments, a predominant Diels-Alder pathway was found
使用Mg(II)/ N,N'-二氧化物配合物作为催化剂,实现了Brassard's二烯与靛红的首次催化不对称杂Diels-Alder反应,从而提供了带有四取代中心的相应手性螺内酯,产率高达99%,最高ee在3小时内达到99%ee和> 99:1 dr。在机理中,基于操作红外实验,在反应中发现了主要的Diels-Alder途径。还提出了一种可能的过渡状态模型。