Al<sub>2</sub>O<sub>3</sub>-Supported Cu-Catalyzed Electrophilic Substitution by PhSeBr in Organoboranes, Organosilanes, and Organostannanes. A Protocol for the Synthesis of Unsymmetrical Diaryl and Alkyl Aryl Selenides
作者:Sukalyan Bhadra、Amit Saha、Brindaban C. Ranu
DOI:10.1021/jo100755g
日期:2010.7.16
Alumina-supported copper sulfate efficiently catalyzes electrophilic substitution in organoborane, organosilanes, and organostannanes by phenylselenium bromide providing a novel and efficient route to the synthesis of unsymmetrical diaryl and alkyl aryl selenides. A series of aryl, alkyl, and heteroaryl phenyl selenides were obtained in high yields. The catalyst is inexpensive, eco- and user-friendly
Magnetically Separable CuFe<sub>2</sub>O<sub>4</sub>Nanoparticle Catalyzed C–Se Cross Coupling in Reusable PEG Medium
作者:K. Harsha Vardhan Reddy、G. Satish、K. Ramesh、K. Karnakar、Y. V. D. Nageswar
DOI:10.1246/cl.2012.585
日期:2012.6.5
A simple and efficient procedure for the synthesis of unsymmetrical diaryl selenides has been developed by magnetically separable CuFe2O4 nanoparticle catalyzed reactions of organoboranes with PhSeBr in recyclable PEG-400 medium at 80 °C and Cs2CO3 as base. Using this protocol, a variety of unsymmetrical selenides were obtained in good to excellent yields. The copper ferrite nanoparticles were magnetically separated, recycled, and reused up to four cycles.