Efficient synthesis of 2-oxazolidinones from epoxides and carbamates catalyzed by amine-functionalized ionic liquids
作者:Jianpeng Shang、Zuopeng Li、Caina Su、Yong Guo、Youquan Deng
DOI:10.1039/c5ra09838f
日期:——
A series of amine-functionalized ionicliquids were prepared and their catalytic performance was tested in the synthesis of 2-oxazolidinones from epoxides and carbamates. Under optimized reaction conditions, good to excellent yields of various 2-oxazolidinones were achieved with different epoxides and carbamates. Moreover, the amine-functionalized ionicliquid catalyst could be easily recovered and
Various types of five-membered heterocyclic compounds such as 2-iminodioxolanes, 2-oxazolidinones, and 2-iminooxazolidines, can be obtained from the cycloaddition of oxiranes with isocyanates or carbodiimides catalyzed by organotin iodide-Lewis base complexes under very mild conditions (40°C, 2h).
Mechanistic Studies of Tetraphenylstibonium Iodide-Catalyzed Cycloaddition of Oxiranes with Heterocumulenes
作者:Masahiro Fujiwara、Akio Baba、Haruo Matsuda
DOI:10.1246/bcsj.63.1069
日期:1990.4
In the selective α-cleavage cycloaddition of oxiranes with heterocumulenescatalyzed by tetraphenylstibonium iodide, the direction of oxirane fission at first stage is not significant, while the difference of reaction behaviors of two antimony alkoxide intermediates (Ph4SbOCH2CH(R1)I and Ph4SbOCH(R1)CH2I), insertion of heterocumulenes and cyclization to original oxiranes, is responsible for the unusual