Pd‐Catalyzed Negishi Cross‐Coupling of Vinyl Bromides with Diborylmethylzinc Chloride
作者:Minjae Kim、Jun Hee Lee、Seung Hwan Cho
DOI:10.1002/bkcs.12212
日期:2021.3
We have developed Pd‐catalyzed Negishi cross‐coupling of diborylmethylzinc chloride with vinyl bromides. The reaction shows a broad scope and an array of α‐boryl‐substituted allylic boronate esters are obtained in high efficiency.
Organocatalysis opens up for a novel cascadereaction concept where 3-oxidopyridinium betaines first undergo an enantioselective [6+4] cycloaddition with trienamines, followed by a spontaneously series of reactions to provide chiral hexahydraoazulenes, of which some show bioactivity.
Controlling Regiochemistry in Negishi Carboaluminations. Fine Tuning the Ligand on Zirconium
作者:Bruce H. Lipshutz、Tom Butler、Asher Lower
DOI:10.1021/ja065769b
日期:2006.12.1
The species on the zirconocene catalyst is changed from two Cp's to the Brintzinger ligand and catalytic amounts of MAO are used to usually effect a >99% regiocontrol of Negishi carboaluminations of 1-alkynes in toluene.
Kleveland,K.; Skattebol,L., Acta chemica Scandinavica. Series B: Organic chemistry and biochemistry, 1975, vol. 29, p. 191 - 196
作者:Kleveland,K.、Skattebol,L.
DOI:——
日期:——
Nonracemic Allylic Boronates through Enantiotopic-Group-Selective Cross-Coupling of Geminal Bis(boronates) and Vinyl Halides
作者:Bowman Potter、Adam A. Szymaniak、Emma K. Edelstein、James P. Morken
DOI:10.1021/ja510266x
日期:2014.12.31
Under the influence of a chiral palladium catalyst, 1,1-bis(pinacolboronate) esters undergo asymmetric cross-coupling with bromoalkenes to generate nonracemic allyl boronates with high levels of enantioselectivity. The so-formed allyl boronates may be oxidized with hydrogen peroxide to provide secondary allylic alcohols or with nitrosobenzene to furnish nonracemic tertiary allylic alcohols. Mechanistic experiments suggest the operation of a pathway involving outer-sphere stereoinvertive transmetalation.