Preparation of γ,δ-unsaturated-β-ketoesters: Lewis acid-catalysed C H insertion of ethyl diazoacetate into α,β-unsaturated aldehydes
作者:Hirenkumar Gandhi、Timothy P. O'Sullivan
DOI:10.1016/j.tetlet.2017.07.095
日期:2017.9
synthesis of γ,δ-unsaturated-β-keto esters was achieved by the Lewis acid-catalysed direct CH insertion of an α-diazoester into various α,β-substituted-unsaturated aldehydes. CH insertion of ethyldiazoacetate into alkyl- and aryl-substituted α,β-unsaturated aldehydes was performed under mild conditions to afford the corresponding γ,δ-unsaturated-β-keto esters in moderate to high yields as a mixture
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
Syntheses Of (±)-Raikovenal, (±)-Preraikovenal, and (±)-Epiraikovenal
作者:Barry B. Snider、Qing Lu
DOI:10.1080/00397919708006097
日期:1997.5
(+/-)-Raikovenal (1a) has been synthesized in five steps from dihydrofilifolone (3) by two Wittig reactions. A similar sequence provides (+/-)-preraikovenal Epiraikovenal (1b) has been prepared by photolysis of preraikovenal or by photolysis of 5 to give 4b. Lewis acid induced cyclization of enal 5 gives cyclopentylideneacetaldehyde 16 rather than bicyclo[3.2.0]heptanecarboxaldehyde 4.
Provided is a composition for removing iron sulfide, containing, as an active ingredient, an α,β-unsaturated aldehyde represented by the following general formula (1):
wherein R1 to R3 each independently represent a hydrogen atom, an alkyl group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, or an aryl group having 6 to 12 carbon atoms, provided that R1 may be connected to R2 or R3, to constitute an alkylene group having 2 to 6 carbon atoms; and that R1 and R2 are not a hydrogen atom at the same time.
Proprietes des α-phenylselenoaldehydes reactions de wittig conduisant a des α-hydroxyesters et cetones β,γ-ethyleniques et a des aldehydes α,β-ethyleniques