Epoxides and Aziridines from Diazoacetates via Ylide Intermediates
作者:Michael P. Doyle、Wenhao Hu、Daren J. Timmons
DOI:10.1021/ol015600x
日期:2001.3.1
An effective methodology is reported for stereospecific epoxidation and aziridination via carbonyl ylide intermediates using rhodium(II) acetate catalyzed reactions of phenyl- and styryldiazoacetates with aldehydes, ketones, or imines.
The rhodium catalyzed three-component reaction of diazoacetates, titanium(iv) alkoxides and aldehydes
作者:Chong-Dao Lu、Hui Liu、Zhi-Yong Chen、Wen-Hao Hu、Ai-Qiao Mi
DOI:10.1039/b502093j
日期:——
The rhodium(II)-catalyzed three-component reaction of diazoacetates, titaniumalkoxides and aldehydes is shown to give alpha-alkoxyl-beta-hydroxyl acid derivatives; the novel C-C bond formation reaction is proposed to occur through oxonium ylides derived from diazo compounds and titaniumalkoxides, and followed by intermolecular trapping by aldehydes.
A new method was developed to synthesize oxirane products from the reaction of diazocarbonyl substrates with aryl aldehydes by using Ag(l) N-heterocyclic carbene complex as the catalyst. A combination of N-heterocyclic carbene silver complex (IPrAgCI) with another silver salt (AgOTf) generated the catalytic active IPr-Ag+ intermediate, which then catalyzed the epoxidation reaction. (C) 2014 Elsevier Ltd. All rights reserved.
Stereoselective synthesis of epoxides by reaction of donor/acceptor-substituted carbenoids with α,β-unsaturated aldehydes
作者:Huw M.L Davies、Jason DeMeese
DOI:10.1016/s0040-4039(01)01415-0
日期:2001.9
The reaction of donor/acceptor-substituted carbenoids with alpha,beta -unsaturated aldehydes results in the highly diastereoselective synthesis of epoxides. (C) 2001 Published by Elsevier Science Ltd.
Structure and Reactivity of Half-Sandwich Rh(+3) and Ir(+3) Carbene Complexes. Catalytic Metathesis of Azobenzene Derivatives
作者:Daniel J. Tindall、Christophe Werlé、Richard Goddard、Petra Philipps、Christophe Farès、Alois Fürstner
DOI:10.1021/jacs.7b12673
日期:2018.2.7
Specifically, the donor/acceptor carbene 10a derived from ArC(═N2)COOMe and [Cp*RhCl2]2 undergoes spontaneous 1,2-migratory insertion of the emerging carbene unit into the Rh-Cl bond with formation of the C-metalated rhodium enolate 11. In contrast, the analogous complexes 10b,c derived from [Cp*RhX2]2 (X = Br, I) as well as the iridium species 13 and 14 derived from [Cp*IrCl2]2 are sufficiently stable