Lanthanide triflate catalyzed 1,3-dipolar cycloaddition reactions: stereoselective synthesis of indenoisoxazolidines
作者:David A Nugiel
DOI:10.1016/s0040-4039(01)00517-2
日期:2001.5
Substituted indenones reacted smoothly with a variety of in situ generated nitrones in the presence of lanthanide triflates to give exclusive exo 1,3-dipolar cycloaddition products in high yield. Judicious choice of the nitrone substituents allowed for further modification of the indenoisoxazolidine core to the corresponding indenoisoxazoline and indenoisoxazole analogs in high yield.
在镧系元素三氟甲磺酸酯的存在下,被取代的茚并酮与各种原位生成的硝酮平稳地反应,从而以高收率得到排他性的1,3,3-偶极环加成产物。允许用于indenoisoxazolidine芯到高收率的相应indenoisoxazoline和indenoisoxazole类似物的进一步修改的硝酮的取代基的明智选择。