Palladium-Catalyzed Reactions of Enol Ethers: Access to Enals, Furans, and Dihydrofurans
作者:Matthew G. Lauer、William H. Henderson、Amneh Awad、James P. Stambuli
DOI:10.1021/ol3028994
日期:2012.12.7
The palladium-catalyzed oxidation of alkyl enolethers to enals, which employs low loadings of a palladium catalyst, is described. The mild oxidation conditions tolerate a diverse array of functional groups, while allowing the formation of di-, tri-, and tetrasubtituted olefins. The application of this methodology to intramolecular reactions of alkyl enolethers containing pendant alcohols provides
Saegusa Oxidation of Enol Ethers at Extremely Low Pd-Catalyst Loadings under Ligand-free and Aqueous Conditions: Insight into the Pd(II)/Cu(II)-Catalyst System
作者:Quan Zhu、Yunsong Luo、Yongyan Guo、Yushun Zhang、Yunhai Tao
DOI:10.1021/acs.joc.0c02987
日期:2021.4.16
system of Saegusa oxidation, which converts enolethers to the corresponding enals with a number of diverse substrates at extremely low catalyst loadings (500 mol ppm) under ligand-free and aqueous conditions, is described. Its synthetic utility was demonstrated by large-scale applications of the catalyst system to important nature molecules. This work allows Saegusa oxidation to become a highly practical
(Cycloalkylidene)bishydroperoxides 3 react with 1,n-dihaloalkanes (n = 3-6) in the presence of CsOH-H2O in DMF affording the corresponding spiro-1,2,4,5-tetraoxacycloalkanes 4 in moderate yields. Compound 4ba exhibits significant antimalarial activity in vitro against P, falciparum. (C) 1999 Elsevier Science Ltd. All rights reserved.
Peroxycarbenium-Mediated C−C Bond Formation: Applications to the Synthesis of Hydroperoxides and Peroxides
作者:Patrick H. Dussault、In Quen Lee、Hyung-Jae Lee、Richard J. Lee、Q. Jason Niu、Jeffrey A. Schultz、Umesh R. Zope
DOI:10.1021/jo991714z
日期:2000.12.1
while SnCl(4) and trimethylsilyl triflate promote formation of peroxides. Lewis acid-promoted reactions of silylated hydroperoxyacetals furnish silylated hydroperoxides, which can be deprotected to homologated hydroperoxides. Hydroperoxyketals undergo Lewis acid-mediated allylation to furnish 1,2-dioxolanes via attack of hydroperoxide on the intermediate carbocation. Lewis acid-mediated cyclization
Pyridine Is an Organocatalyst for the Reductive Ozonolysis of Alkenes
作者:Rachel Willand-Charnley、Thomas J. Fisher、Bradley M. Johnson、Patrick H. Dussault
DOI:10.1021/ol300617r
日期:2012.5.4
Whereas the cleavage of alkenes by ozone typically generates peroxide intermediates that must be decomposed in an accompanying step, ozonolysis in the presence of pyridine directly generates ketones or aldehydes through a process that neither consumes pyridine nor generates any detectable peroxides. The reaction is hypothesized to involve nucleophile-promoted fragmentation of carbonyl oxides via formation