对于功能化的苄基溴化物与三芳基铋试剂的化学选择性交叉偶联,证明了一种有效的钯催化方案。在既定条件下,钯在DMA中在90°C下在DMA中存在K 3 PO 4碱的条件下催化1 h,使用三芳基铋试剂进行的三重芳基化反应可通过电子形式多样的苄基溴顺利进行。所有偶联反应均以高收率提供了相应的官能化二芳基甲烷。
A Zwitterionic Palladium(II) Complex as a Precatalyst for Neat-Water-Mediated Cross-Coupling Reactions of Heteroaryl, Benzyl, and Aryl Acid Chlorides with Organoboron Reagents
A zwitterionic palladium(II) complex has been found to be an efficient catalyst for Suzuki–Miyaura cross‐coupling reactions of aryl and heteroaryl organoboron reagents with various heteroaryl chlorides, aryl‐ and heteroarylmethyl chlorides, and aryl acid chlorides in neat water.
Threefold and chemoselective couplings of triarylbismuths with benzylic chlorides and iodides using palladium catalysis
作者:Maddali L. N. Rao、Ritesh J. Dhanorkar
DOI:10.1039/c3ra46672h
日期:——
This paper describes the palladium-catalyzed studies on threefold coupling of triarylbismuth reagents with benzylic chlorides and iodides. The optimized protocol conditions are operationally simple, delivering threefold coupling of a variety of triarylbismuths in combination with benzylic chlorides and iodides. The two optimized protocols allowed the synthesis of a diverse range of unsymmetrical diarylmethanes in an efficient manner. As part of this study, chemoselective transformation of benzylic chlorides and iodides was also achieved.
Direct Method for Carbon-Carbon Bond Formation: The Functional Group Tolerant Cobalt-Catalyzed Alkylation of Aryl Halides
作者:Muriel Amatore、Corinne Gosmini
DOI:10.1002/chem.201000178
日期:2010.5.25
cobalt‐catalyzedalkylation of aryl halides has been developed that proceeds smoothly in the presence of phosphanes or bipyridines as ligands with a variety of alkylhalides, including challenging alkyl electrophiles bearing β‐hydrogen atoms (see scheme). Sensitive functional groups are tolerated on both coupling partners, thus, significantly extending the general scope of transition‐metal‐catalyzed