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.
Novel compounds and a novel process for their preparation
申请人:Fagnou Keith
公开号:US20080300271A1
公开(公告)日:2008-12-04
The present invention is directed to a procedure for making an enantidimerically enriched compound containing a hydronaphthalene ring structure. The process involves reacting oxabenzonorbornadienes with nuclophiles using rhodium as a catalyst and in the presence of a phosphine ligand. The compounds synthesized may be used in pharmaceutical preparations for the treatment of a variety of diseases and conditions.
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).
RHODIUM-PHOSPHORUS COMPLEXES AND THEIR USE IN RING OPENING REACTIONS
申请人:Heller Detfleff
公开号:US20110004005A1
公开(公告)日:2011-01-06
The present invention is directed to novel rhodium-phosphorus complexes of formula: [Rh(PP′)(solv)
2
]X the process for their preparation and their use as catalysts in the ring opening reaction of heteronorbornenes and other α,β-unsaturated compounds.