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.
Expanding the limit of Pd-catalyzed decarboxylative benzylations
作者:Duanyang Kong、Patrick J. Moon、Wenyu Qian、Rylan J. Lundgren
DOI:10.1039/c8cc02380h
日期:——
The Pd-catalyzed decarboxylative cross-coupling of electron-deficient aryl acetates with arylbromides is reported. The method widens the scope of benzylic partners that can undergo efficient reactivity from highly activated nitrophenylacetates established previously, to a diverse series of substrates bearing modestly stabilizing groups, allowing direct access to functionalized diarylmethanes. Mechanistic
Pd-catalyzed chemoselective threefold cross-coupling of triarylbismuths with benzylic bromides
作者:Maddali L. N. Rao、Ritesh J. Dhanorkar
DOI:10.1039/c3ra40413g
日期:——
for the chemoselective cross-coupling of functionalized benzylic bromides with triarylbismuthreagents. Under the established conditions, catalyzed by palladium in the presence of K3PO4 base in DMA at 90 °C for 1 h, the threefoldarylations using triarylbismuthreagents proceeded smoothly with electronically diverse benzylic bromides. All the coupling reactions furnished the corresponding functionalized
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。