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
Copper Phosphoramidite Catalyzed Enantioselective Ring-Opening of Oxabicyclic Alkenes: Remarkable Reversal of Stereocontrol
作者:Fabio Bertozzi、Mauro Pineschi、Franco Macchia、Leggy A. Arnold、Adriaan J. Minnaard、Ben L. Feringa
DOI:10.1021/ol026220u
日期:2002.8.1
[GRAPHICS]An unprecedented copper phosphoramidite catalyzed enantioselective alkylative ring-opening reaction of oxabenzonorbornadiene derivatives with dialkylzinc reagents is reported. The reaction shows high levels of ant stereoselectlvity (up to anti/syn >99:1), complementary to the Pd(0)-catalyzed syn-selective ring-opening protocol, allowing a new entry to anti-dihydronaphthols with high enantioselectivity (up to 99% ee).
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
DOI:10.1002/anie.200460087
日期:2004.7.26
Palladium-Catalyzed Enantioselective Alkylative Ring Opening