Enantioselective synthesis of dihydrocoumarin derivatives by chiral scandium(<scp>iii</scp>)-complex catalyzed inverse-electron-demand hetero-Diels–Alder reaction
作者:Haipeng Hu、Yangbin Liu、Jing Guo、Lili Lin、Yali Xu、Xiaohua Liu、Xiaoming Feng
DOI:10.1039/c4cc10343b
日期:——
An asymmetric inverse-electron-demand hetero-Diels-Alder reaction between o-quinone methides and azlactones to generate potentially pharmacological active dihydrocoumarins has been achieved efficiently by using a chiral N,N'-dioxide-Sc(III) complex as the catalyst. The desired products were obtained in high yields with excellent enantioselectivities and diastereoselectivities (up to 94% yield, 96%
通过使用手性N,N'-二氧化物-Sc(III)络合物作为催化剂,可以有效地实现邻醌甲基化物和between内酯之间的不对称逆电子需求异Diels-Alder反应,以产生潜在的药理活性二氢香豆素。在温和的反应条件下,以高收率获得具有优异的对映选择性和非对映选择性(高达94%收率,96%ee和> 19:1 dr)的所需产物。Operando IR和对照实验证实了一致的反应途径。