Fesulphos-Palladium(II) Complexes as Well-Defined Catalysts for Enantioselective Ring Opening of Meso Heterobicyclic Alkenes with Organozinc Reagents
作者:Silvia Cabrera、Ramón Gómez Arrayás、Inés Alonso、Juan C. Carretero
DOI:10.1021/ja055692b
日期:2005.12.1
The air-stable and readily available cationic methyl palladium(II) complexes of planarchiral Fesulphos ligands [(Fesulphos)Pd(Me)(PhCN)]+ X- are highlyefficientcatalysts for the alkylative ringopening of oxa- and azabicyclicalkenes with dialkylzinc reagents, showing broad scope with regards to both the bicyclic substrate and the dialkylzinc reagent. Catalyst loading as low as 0.5 mol % is sufficient
Nickel-catalyzed <i>syn</i>-stereocontrolled ring-opening of oxa- and azabicyclic alkenes with dialkylzinc reagents
作者:Yingying Deng、Wen Yang、Yongqi Yao、Xin Yang、Xiongjun Zuo、Dingqiao Yang
DOI:10.1039/c8ob02864h
日期:——
A new nickel-catalyzed syn-stereocontrolled ring-opening of oxa- and azabicyclicalkenes with dialkylzinc reagents was developed, which afforded the corresponding cis-2-alkyl-1,2-dihydronaphthalen-1-ols and 1,2-alkyl amide derivatives in moderate to excellent yields (up to 99% yield) under mild conditions. In this work, we successfully avoided obtaining hydride addition byproducts arising from β-hydride
Cationic Pd<sup> <i>II</i> </sup> Complexes of Fesulphos Ligands: Highly Efficient Catalysts for the Enantioselective Ring Opening of Oxa- and Azabicyclic Alkenes with Dialkylzinc Reagents
作者:Silvia Cabrera、Inés Alonso、Ramón Gómez Arrayás、Olga Familiar、Juan C. Carretero
DOI:10.1080/10426500590913474
日期:2005.3.2
The Pd-catalyzed enantioselective ring-opening reaction of meso oxaand azabicyclic alkenes with dialkylzinc reagents reported by Lautens et al.1 constitutes a synthetically outstanding C C bond-forming desymmetrization reaction. Herein we describe that cationic methyl PdII complexes of Fesulphos ligands2 serve as excellent catalysts for this asymmetric transformation, allowing the performance of the
A multinuclear palladium catalyst can be used to realize the efficient catalytic asymmetric alkylative ring-opening reaction of oxabicyclic alkenes using dimethylzinc. The use of (R)-BINOL-PHOS bearing bisphosphine and diol moieties is essential for achieving excellent catalytic performance; the corresponding monophosphine and hydroxy-protected derivatives showed lower catalytic activities and/or enantioselectivities. The generation of Pd/Zn-multinuclear complexes is a key feature of the present catalysis.
Cationic Planar Chiral Palladium P,S Complexes as Highly Efficient Catalysts in the Enantioselective Ring Opening of Oxa- and Azabicyclic Alkenes
作者:Silvia Cabrera、Ramón Gómez Arrayás、Juan C. Carretero