An unprecedented transfer of selenium ion from potassium selenocyanate was observed in C-Se cross-coupling reaction catalyzed by copper oxide nanoparticles under ligand-free conditions. Utilizing this protocol wide range of symmetrical diaryl selenides were obtained in excellent yields. Nano-CuO is recyclable up to four cycles without loss of catalytic activity.
An efficient and conceptually new protocol for C–Secrosscoupling of potassium selenocyanate with arylhalides via copper-catalyzed cascade reaction has been developed in water. Utilizing this protocol, a variety of aryl and heteroaryl halides were reacted with potassium selenocyanate to afford the corresponding diaryl selenides in moderate to good yields.
Unexpected C−Se Cross-Coupling Reaction: Copper Oxide Catalyzed Synthesis of Symmetrical Diaryl Selenides via Cascade Reaction of Selenourea with Aryl Halides/Boronic Acids
作者:V. Prakash Reddy、A. Vijay Kumar、K. Rama Rao
DOI:10.1021/jo102017g
日期:2010.12.17
Selenourea is used as an effective selenium surrogate in the C−Se cross-couplingreaction catalyzed by copper oxide nanoparticles under ligand free conditions. This protocol has been utilized for the synthesis of a variety of symmetrical diaryl selenides in good to excellent yields from the readily available arylhalides/boronicacids.
efficient, and eco-friendly synthetic protocol has been developed for the preparation of diaryl seleniumcompounds. To the best of our knowledge, this is the first Letter on the use of selenium dioxide as selenium source for the synthesis of diaryl selenides. Compared with other selenium sources the new source SeO2 gives an environment-friendly and low-cost synthetic route, which may be useful for