DIRHODIUM CATALYST COMPOSITIONS AND SYNTHETIC PROCESSES RELATED THERETO
申请人:EMORY UNIVERSITY
公开号:US20140155643A1
公开(公告)日:2014-06-05
This disclosure relates to compositions comprising dirhodium catalysts and uses related thereto, e.g., in enantioselective transformations of donor/acceptor carbenoids. In certain embodiments, the dirhodium catalyst comprises a cyclopropyl ring substituted with a carboxylic acid ligand. In certain embodiments, the disclosure relates to compositions comprising a compound of the following formula, or salts thereof wherein, R
1
, R
2
, and R
3
are defined herein.
Composite Polymer/Oxide Hollow Fiber Contactors: Versatile and Scalable Flow Reactors for Heterogeneous Catalytic Reactions in Organic Synthesis
作者:Eric G. Moschetta、Solymar Negretti、Kathryn M. Chepiga、Nicholas A. Brunelli、Ying Labreche、Yan Feng、Fateme Rezaei、Ryan P. Lively、William J. Koros、Huw M. L. Davies、Christopher W. Jones
DOI:10.1002/anie.201500841
日期:2015.5.26
Flexible compositepolymer/oxidehollowfibers are used as flowreactors for heterogeneously catalyzed reactions in organicsynthesis. The fibersynthesis allows for a variety of supported catalysts to be embedded in the walls of the fibers, thus leading to a diverse set of reactions that can be catalyzed in flow. Additionally, the fibersynthesis is scalable (e.g. several reactor beds containing many
<i>D</i><sub>2</sub>-Symmetric Dirhodium Catalyst Derived from a 1,2,2-Triarylcyclopropanecarboxylate Ligand: Design, Synthesis and Application
作者:Changming Qin、Vyacheslav Boyarskikh、Jørn H. Hansen、Kenneth I. Hardcastle、Djamaladdin G. Musaev、Huw M. L. Davies
DOI:10.1021/ja2074104
日期:2011.11.30
Dirhodium tetrakis-(R)-(1-(4-bromophenyl)-2,2-diphenylcyclopropanecarboxylate) (Rh-2(R-BTPCP)(4)) was found to be an effective chiral catalyst for enantioselective reactions of aryl- and styryldiazoacetates. Highly enantioselective cyclopropanations, tandem cyclopropanation/Cope rearrangements and a combined C- functionalization/Cope rearrangement were achieved using Rh-2(R-BTPCP)(4) as catalyst. The advantages of Rh-2(R-BTPCP)(4) include its ease of synthesis, its tolerance to the size of the ester group in the styryldiazoacetates, and its compatibility with clichloromethane as solvent. Computational studies suggest that the catalyst adopts a D-2-symmetric arrangement, but when the carbenoid binds to the catalyst, two of the p-bromophenyl groups on the ligands rotate outward to make room for the carbenoid and the approach of the substrate to the carbenoid.
US8975428B2
申请人:——
公开号:US8975428B2
公开(公告)日:2015-03-10
From Serendipity to Rational Design: Heteroleptic Dirhodium Amidate Complexes for Diastereodivergent Asymmetric Cyclopropanation
stannylated cyclopropanes to be made selectively and in excellent optical purity, this transformation also marks a rare case of diastereodivergent asymmetric catalysis. The products are amenable to stereospecific cross coupling with aryl halides or alkenyl triflates; these transformations appear to be the first examples of the formation of stereogenic quaternary carbon centers by the Stille reaction; carbonylative