Enantioselective dirhodium(II)-catalyzed cyclopropanations with trimethylsilylethyl and trichloroethyl aryldiazoacetates
作者:Solymar Negretti、Carolyn M. Cohen、Jane J. Chang、David M. Guptill、Huw M.L. Davies
DOI:10.1016/j.tet.2015.05.045
日期:2015.9
readily prepared by rhodium-catalyzedcyclopropanation of alkenes with aryldiazoacetates and styryldiazoaceates, in which the ester functionality is either trimethylsilylethyl (TMSE) or trichloroethyl (TCE). By having labile protecting groups on the ester, chiral triarylcyclopropane carboxylate ligands were conveniently prepared. The asymmetric induction during cyclopropanation is dependent on the
Role of Sterically Demanding Chiral Dirhodium Catalysts in Site-Selective C–H Functionalization of Activated Primary C–H Bonds
作者:Changming Qin、Huw M. L. Davies
DOI:10.1021/ja504797x
日期:2014.7.9
sterically demanding dirhodium tetracarboxylate catalysts on the site selectivity of C-H functionalization by means of rhodium carbene-induced C-Hinsertion is described. The established dirhodium tetraprolinate-catalyzed reactions of aryldiazoacetates cause preferential C-H functionalization of secondary C-H bonds as a result of competing steric and electronic effects. The sterically more demanding dirhodium
Design of catalysts for site-selective and enantioselective functionalization of non-activated primary C–H bonds
作者:Kuangbiao Liao、Yun-Fang Yang、Yingzi Li、Jacob N. Sanders、K. N. Houk、Djamaladdin G. Musaev、Huw M. L. Davies
DOI:10.1038/s41557-018-0087-7
日期:2018.10
stereoselectivity of the C–H functionalization. We have been developing dirhodium catalysts with different selectivity profiles in C–H functionalizationreactions with donor/acceptor carbenes as reactive intermediates. Here we describe a new dirhodium catalyst capable of the functionalization of non-activated primary C–H bonds with high levels of site selectivity and enantioselectivity.
Blue light-promoted photolysis of aryldiazoacetates
作者:Igor D. Jurberg、Huw M. L. Davies
DOI:10.1039/c8sc01165f
日期:——
Aryldiazoacetates can undergo photolysis under blue light irradiation (460–490 nm) at room temperature and under air in the presence of numerous trapping agents, such as styrene, carboxylic acids, amines, alkanes and arenes, thus providing a straighforward and general platform for their mild functionalization.
An Immobilized‐Dirhodium Hollow‐Fiber Flow Reactor for Scalable and Sustainable C−H Functionalization in Continuous Flow
作者:Chun‐Jae Yoo、Daniel Rackl、Wenbin Liu、Caroline B. Hoyt、Brian Pimentel、Ryan P. Lively、Huw M. L. Davies、Christopher W. Jones
DOI:10.1002/anie.201805528
日期:2018.8.20
A scalable flow reactor is demonstrated for enantioselective and regioselective rhodium carbene reactions (cyclopropanation and C−H functionalization) by developing cascade reaction methods employing a microfluidic flow reactor system containing immobilized dirhodiumcatalysts in conjunction with the flow synthesis of diazo compounds. This allows the utilization of the energetic diazo compounds in