Carbene Based Palladium-catalyzed Mizoroki-Heck Reaction
作者:VIVEK SRIVASTAVA
DOI:10.13005/ojc/280444
日期:2012.12.22
Different perhydrobenzimidazolinium chloride salts were used as a ligand for PdcatalysedMizoroki-Heck reaction. The in situ generation of carbene is the attractive feature of this catalytic system. The corresponding Mizoroki-Heck products were obtained in good yield.
Syntheses and catalytic activities of pseudo-pincer and CSC pincer-type Pd(II) complexes derived from benzannulated N-heterocyclic carbenes
作者:Han Vinh Huynh、Dan Yuan、Yuan Han
DOI:10.1039/b907887h
日期:——
Three new dibenzimidazolium salts bearing thioether (B·2HBr, B·2HNO3) and sulfoxide (C·2HBr) containing bridges have been synthesized as sulfur-functionalized dicarbene precursors. Palladation of B·2HBr and C·2HBr afforded two new pseudo-pincer complexes cis-[PdBr2(B-κ2C)] (1) and cis-[PdBr2(C-κ2C)] (2), in which the sulfur-donor remains pendant. Reaction of precursor B·2HNO3 in the presence of 1 equiv of KBr, on the other hand, yields the first CSC-Pd(II) pincer complex [PdBr(B-κ3CSC)]NO3 (3) bearing two carbene moieties. All three complexes have been fully characterized by multinuclei NMR spectroscopies, ESI mass spectrometry and X-ray diffraction analysis. Their catalytic activities in the Mizoroki–Heck reaction have been evaluated as well.
air-stable palladium(II)-Schiff base complex supported on h-BN was simply prepared by using commercially available reagents. This nanomaterial was applied as an excellent and recyclable heterogeneous catalyst for the Suzuki and Heck cross-couplingreactions. And it has been characterized by FT-IR, XRD, SEM, XPS, TG and ICP-AES techniques. High yields, ligand-free, low reaction time, water as solvent
The Michael addition of a chiral amine [(-)- 6] to alpha,beta-unsaturated esters ( 4) was attained and the stereoselectivity was inverted by changing the solvent from diethyl ether to tetrahydrofuran when alpha,beta-unsaturated esters having an aromatic ring at the beta-position were employed. In addition, the chiral auxiliary in the Michael adducts ( 9A) was facilely removed with N-iodosuccinimide
Palladium-catalyzed Heck coupling of arylhydrazines via C–NHNH<sub>2</sub>bond activation
作者:Jin-Biao Liu、Fu-Jiao Chen、Na Liu、Jiang Hu
DOI:10.1039/c5ra05131b
日期:——
A novel palladium-catalyzed Heck coupling reaction of arylhydrazines with olefins is described, which affords various styrenes with high efficiency. This transformation proceeds through a C–NHNH2bond activation under mild conditions.