Rhodium(III) and Hexabromobenzene-A Catalyst System for the Cross-Dehydrogenative Coupling of Simple Arenes and Heterocycles with Arenes Bearing Directing Groups
can be used as the cooxidant/catalyst modifier for the [RhIIICp*]‐catalyzed (Cp*=C5Me5) dehydrogenativecross‐coupling of benzamides with simple benzene derivatives (see scheme, DG=directing group). Similarly, heterocycles can be coupled and druglike structures formed. Mechanistic studies suggest a unique and multiple role of the Cu(OAc)2/C6Br6 system and a nonchelate‐assisted CH activation as the
C 6 Br六和 毒品!C 6 Br 6可用作苯甲酰胺与简单苯衍生物的[Rh III Cp *]催化(Cp * = C 5 Me 5)脱氢交叉偶联的助氧化剂/催化剂改性剂(请参见方案,DG =指导基团)。类似地,杂环可以偶联并形成药物样结构。机理研究表明,Cu(OAc)2 / C 6 Br 6系统具有独特的多重作用,而非螯合物辅助的CH活化是决定速率的步骤。
PROCESS FOR PREPARING SUBSTITUTED BIPHENYLS BY C-H ACTIVATION
申请人:BAYER CROPSCIENCE AG
公开号:US20150203440A1
公开(公告)日:2015-07-23
The present invention relates to a novel process for preparing substituted biphenyls of the formula (III) by reacting arenes of the formula (I) with arenes of the formula (II) in the presence of a transition metal catalyst and of at least one oxidizing agent. R
1
is NO
2
, an amino or amide group or a Schiff base.
Process for preparing substituted biphenyls by C-H activation
申请人:BAYER CROPSCIENCE AG
公开号:US09199915B2
公开(公告)日:2015-12-01
The present invention relates to a novel process for preparing substituted biphenyls of the formula (III) by reacting arenes of the formula (I) with arenes of the formula (II) in the presence of a transition metal catalyst and of at least one oxidizing agent. R1 is NO2, an amino or amide group or a Schiff base.