A nickel precatalyst for efficient cross-coupling reactions of aryl tosylates with arylboronic acids: vital role of dppf
作者:Feng Hu、Xiangyang Lei
DOI:10.1016/j.tet.2014.04.059
日期:2014.6
An air-stable and easy-to-handle nickelprecatalyst, (9-phenanthrenyl)Ni(II)(PPh3)2Cl, was examined for the cross-couplingreactions of aryl tosylates with arylboronic acids. Under the optimized reaction conditions, the catalytic system tolerates a wide range of activated, neutral and deactivated substrates. The selectivity of this cross-couplingreaction towards aryl tosylates and arylboronic acids
Polyaniline coated on celite, a heterogeneous support for palladium: applications in catalytic Suzuki and one-pot Suzuki–aldol reactions
作者:Heta A. Patel、Arun L. Patel、Ashutosh V. Bedekar
DOI:10.1039/c6nj02402e
日期:——
Particles of celite were coated with polyaniline, characterized and used as a support for heterogenization of palladium metal ions. The prepared heterogeneous palladium catalysts were screened for Suzuki–Miyaura and one-pot Suzuki–aldol reactions with high conversions. The process of heterogenization on celite reduces the PANI consumption ten-fold when anchoring palladium ions onto the support. The
Cross-coupling of Aryl/Alkenyl Silyl Ethers with Grignard Reagents through Nickel-catalyzed C–O Bond Activation
作者:Fei Zhao、Da-Gang Yu、Ru-Yi Zhu、Zhenfeng Xi、Zhang-Jie Shi
DOI:10.1246/cl.2011.1001
日期:2011.9.5
C–O activation and its application have drawn much attention since oxygen-based electrophiles are easily available, less toxic, and more environmentally benign. This letter presents systematically results on the Ni-catalyzed Kumada–Tamao–Corriu coupling based on siloxy arenes/alkenes, which provides a new strategy of silyl protection/C–C bond formation sequence in organic synthesis.
Efficient One-Pot Suzuki–Miyaura Double Cross-Coupling Reactions Using Very Low Pd(PPh<sub>3</sub>)<sub>4</sub>Catalyst Loading
作者:Almeqdad Y. Habashneh、Othman O. Dakhil、Ahmed Zein、Paris E. Georghiou
DOI:10.1080/00397910902898577
日期:2009.11.5
Abstract Suzuki–Miyaura double cross-coupling to form teraryls of interest as Schiff-base precursors can be achieved efficiently in near-quantitative yields using a low mol% amount of Pd(PPh3)4 and easily accessible dibromoaryls.
An ethericNegishicoupling: The first cross‐coupling reaction between aryl alkyl ethers and dianion‐type zincate reagents to afford biaryl compounds through selective cleavage of the ethericC(sp2)O bond was developed. Dianion‐type zincates showed excellent reactivity toward the aromatic ethersundermildconditions, with good functional group compatibility (see scheme).