Copper-Catalyzed Ring-Opening of Heterobicyclic Alkenes with Grignard Reagents: Remarkably High<i>anti</i>-Stereocontrol
作者:Ramón Gómez Arrayás、Juan Carlos Carretero、Silvia Cabrera
DOI:10.1055/s-2006-926379
日期:——
protocols for the ring-opening reaction of heterobicyclic alkenes with carbon nucleophiles which typically occur with syn selectivity, the alkylative ring-opening reaction of [2.2.1]oxa- and azabicyclicalkenes with Grignard reagents in the presence of a catalytic amount of copper(I) takes place with very high or complete anti-stereocontrol under smooth reaction conditions. This new procedure proved to
A highly enantioselective method for the copper-catalyzed desymmetrization of oxabenzonorbornadienes with aluminum reagents and SimplePhos as chiral ligand has been developed. The same reaction with Grignard reagents is also reported. A wide range of alkyl chains have been used with moderate to high enantioselectivity and high trans selectivity. The transfer of a methyl group is also reported with
Copper-Catalyzed Asymmetric Ring Opening of Oxabicyclic Alkenes with Grignard Reagents
作者:Wei Zhang、Li-Xin Wang、Wen-Jian Shi、Qi-Lin Zhou
DOI:10.1021/jo050015l
日期:2005.4.1
Simple Grignard reagents were applied in copper-catalyzed asymmetricring-openingreactions of oxabenzonorbornadiene derivatives using spiro phosphoramidite ligands. Excellent anti-stereoselectivities and good enantioselectivities were achieved.
Copper-Catalyzed Anti-Stereocontrolled Ring Opening of Oxabicyclic Alkenes with Grignard Reagents
作者:Ramón Gómez Arrayás、Silvia Cabrera、Juan C. Carretero
DOI:10.1021/ol034283m
日期:2003.4.1
[reaction: see text] A general copper-catalyzed procedure for the stereoselective ringopening of [2.2.1]-oxabicyclic alkenes with Grignardreagents is described. In the presence of catalytic amounts of CuCl/PPh(3) the reaction occurs with very high or complete anti selectivity in all cases.
Unprecedented catalytic enantioselective trapping of arene oxides with dialkylzinc reagentsElectronic supplementary information (ESI) available: experimental details. See http://www.rsc.org/suppdata/cc/b1/b108541g/
作者:Fabio Bertozzi、Paolo Crotti、Federica Del Moro、Ben L. Feringa、Franco Macchia、Mauro Pineschi
DOI:10.1039/b108541g
日期:2001.12.19
The first catalytic enantioselective trapping of symmetrical and racemic arene oxides with organometallic reagents is reported.