Synthesis of Oxazolidinones from Epoxides and Isocyanates Catalyzed by Rare-Earth-Metal Complexes
作者:Peng Wang、Jie Qin、Dan Yuan、Yaorong Wang、Yingming Yao
DOI:10.1002/cctc.201403015
日期:2015.4.7
Rare‐earth‐metal complexes stabilized by an amino‐bridged triphenolate ligand showed high efficiency in catalyzing the cycloaddition of isocyanates and epoxides in the presence of NBu4I under mild conditions. This strategy is applicable to both terminal and disubstituted epoxides as well as various isocyanates, and tolerated different types of functional groups. Moreover, it is highly regio‐ and stereoselective
由氨基桥联的三酚盐配体稳定的稀土金属络合物在温和条件下在NBu 4 I存在下对异氰酸酯和环氧化物的环加成反应表现出较高的催化效率。该策略适用于端基和二取代的环氧化物以及各种异氰酸酯,并能耐受不同类型的官能团。此外,它具有高度的区域选择性和立体选择性,在大多数情况下以中等到良好的产率提供3,5-二取代的恶唑烷酮作为唯一的产品。