Direct preparation of benzylic manganese reagents from benzyl halides, sulfonates, and phosphates and their reactions: applications in organic synthesis
作者:YoungSung Suh、Jun-sik Lee、Seoung-Hoi Kim、Reuben D Rieke
DOI:10.1016/s0022-328x(03)00500-x
日期:2003.11
The use of highly active manganese (Mn)*, prepared by the Rieke method, was investigated for the direct preparation of benzylic manganese reagents. The oxidative addition of the highly active manganese to benzylic halides was easily completed under mild conditions. Moreover, benzylic manganese sulfonates and phosphates were prepared by direct oxidative addition of Mn* to the carbon–oxygen bonds of
cobalt‐catalyzed arylation of benzyl chlorides has been developed in order to form functionalized diarylmethanes. A variety of reactive groups either on the aryl or the benzyl halide was employed. This represents the first cobalt‐catalyzed reductive cross‐coupling which does not require any ligand and pyridine. A reaction pathway is proposed involving a radical benzyl species.
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。