Copper(II)-Catalyzed Dehydrogenative Cross-Coupling between Two Azoles
作者:Xurong Qin、Boya Feng、Jiaxing Dong、Xiaoyu Li、Ying Xue、Jingbo Lan、Jingsong You
DOI:10.1021/jo301128y
日期:2012.9.7
The copper(II)-catalyzed dehydrogenative coupling between two different azoles for the preparation of unsymmetrical biazoles has been developed. The current catalytic system can effectively control the chemoselectivity for heterocoupling over homocoupling.
the synthesis of 2,5-disubstitutedoxazolesvia iodine-promoted oxidative domino cyclization. These reactions were performed with readily available methyl azaarenes and α-amino ketones under metal-free conditions. This protocol is a simple method with high functional group compatibility, a wide range of substrates, and excellent yield, providing a new way to synthesize azaarene-attached oxazoles.
Copper(II)-Mediated Dehydrogenative Cross-Coupling of Heteroarenes
作者:Zhifeng Mao、Zhe Wang、Zhaoqing Xu、Fei Huang、Zhengkun Yu、Rui Wang
DOI:10.1021/ol301517y
日期:2012.8.3
Cu(OAc)(2)-mediated dehydrogenative cross-coupling between two heteroarenes has been realized in the absence of any other additive. A mechanism involving a formal Cu(II) to Cu(0) route by convergent disproportionation of the copper mediator is proposed and has been evidenced by copper mirror formation during the reaction. This synthetic protocol provides a concise and "green" access to unsymmetrical biheteroarenes bearing structural motifs of substantial utility in organic synthesis.