Rhodium-Catalyzed Asymmetric Ring Opening of Oxabicyclic Alkenes with Phenols
作者:Mark Lautens、Keith Fagnou、Mark Taylor
DOI:10.1021/ol005729r
日期:2000.6.1
The scope of the rhodium-catalyzed asymmetric ringopening reaction of oxabenzonorbornadiene has been extended to include phenolic nucleophiles. The enanatioenriched, functionalized dihydronaphthalene products are highly valuable intermediates for which no other practical methods of preparation are available. A new catalyst system has been developed which allows the use of less reactive o-halophenols
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.
high regio- and diastereoselectivity (>99:1), and excellent enantioselectivity (up to 99%ee). Symmetrical substitution patterns on the aromatic ring of the oxabenzonorbornadienes had no effect on the course of the reaction nor the enantioselectivity. The reaction produces an unusual stereochemical outcome for oxabicyclicringopenings since the trans rather than the cis product is formed. Very low catalyst