Reaction Of Enones Research Articles

Synthesis of New Pseudo‐C‐Nucleosides Containing Pyrazole Rings in their Structure

Synthetic approaches to new 4‐(furanos‐4‐C‐yl)‐1H‐pyrazole and 3‐(furanos‐4‐C‐yl)‐1H‐pyrazole derivatives are described, including its pyrazole‐5‐carboxylate derivative, which is a pyrazofurin analogue. Preparation of related 5‐acetoxy‐1‐acetyl‐1H‐pyrazole, 5‐acetoxy‐1H‐pyrazole‐1‐carboxylate, and 4,5‐dihydro‐1‐phenyl‐1H‐pyrazol‐5‐one derivatives is also reported. The formation of the pyrazole rings was accomplished either by reaction of enones and of 1,3‐diketones with N‐nucleophiles or by ring closure of a diazoketone.

Palladium/Me3SiOTf‐Catalyzed Bis‐silylation of α,β‐Unsaturated Carbonyl Compounds Without Involving Oxidative Addition of Disilane.

AbstractFor Abstract see ChemInform Abstract in Full Text.

Palladium/Me(3)SiOTf-catalyzed bis-silylation of alpha,beta-unsaturated carbonyl compounds without involving oxidative addition of disilane.

In the presence of a catalytic amount of Me(3)SiOTf and palladium(0), the addition of disilane to alpha,beta-unsaturated carbonyl compounds proceeds under very mild conditions via eta(3)-siloxyallylpalladium generated by the reaction of enone, enal, or aromatic aldehyde with palladium and Me(3)SiOTf.

Synthesis of a Highly Functionalized Triquinane: Studies Towards a Total Synthesis of Subergorgic Acid and Its Analogues

Reaction of enone (11) with the bifunctional Grignard reagent (7) in the presence of copper(I) bromide – dimethyl sulfide, followed by intramolecular alkylation of the resultant chloroketone (15) gave the tricyclic ketone (12). The tricyclic ketone (12) was transformed into the angular triquinane dienedione (9) by means of an 8-step sequence.

Diels–Alder reactions of carbonyl-containing dienophiles catalyzed by tungstophosphoric acid supported on silica gel

Tungstophosphoric acid (H3PW12O40) supported on silica gel proved to be an active heterogeneous catalyst for Diels–Alder reactions of enones with various dienes. The Diels–Alder adducts were formed in high regio- and/or stereoselectivity. In some cases the Diels–Alder reactions were accompanied by competing polymerization of the starting compounds. We also found that trifluoromethanesulfonic acid (triflic acid) is an effective homogeneous catalyst for the reaction of unprotected but-3-en-2-one (methyl vinyl ketone) with 1,3-cyclohexadiene, albeit with a lower activity than tungstophosphoric acid.

ChemInform Abstract: Macromolecular Materials in Heterogeneous Catalysis: An Aluminum Silasesquioxane Gel as Active Catalyst in Diels‐Alder Reactions of Enones.

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.

Functionalization of C60 by Cycloaddition Reactions

ABSTRACTFunctionalization of C60 has been achieved by [2+2] photocycloaddition reactions of enones and [2+4] cycloaddition reactions of dienes, the course of these reactions can be followed using electrospray mass spectrometry using a special tagging reagent. Using tagged C60 it was shown that cis and trans cycloadducts are formed from ketones such as 3-methylcyclohexenone. We have also employed the new technique of 3He NMR spectrometry. 3He is an NMR-active nucleus. Fullerenes containing an endohedral 3He atom can be examined by NMR to obtain structural information and potentially determine isomer distributions. Examples, of helium spectra of fullerene hydrides are presented.

ChemInform Abstract: Nitroketene Aminals. Part 11. Reaction of Enones with N,N′‐Cyclically Alkylated Nitroketene Aminals.

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.

ChemInform Abstract: Triplet 1,4‐Biradical Intermediates in the Photocycloaddition Reaction of Enones and N‐Acylindoles with Alkenes.

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.

ChemInform Abstract: Reaction of Enones with Iodine in the Presence of Ce(IV) ‐ Synthesis of 2‐Iodovinyl Ketones.

ChemInform Abstract: Reaction of Enones with Iodine in the Presence of Ce(IV) ‐ Synthesis of 2‐Iodovinyl Ketones.

ChemInform Abstract: The Reaction of Enones with Electrophiles

ChemInform Abstract: The Reaction of Enones with Electrophiles

Observations on the effect of silanes on the reaction of 10-methyl.Δ 19-2-octalone with lithium dimethylcuprate(I)

The influence of silanes on the reaction of enones with cuprates has been examined using the title enone compound and Me 2CuLi.LiI. In ether solvent the effect the effect of various silanes on the 1,4/1,2 addition ratio was minor. In tetrahydrofuran significantly increased 1,4/1,2 addition ratios and increased conversion of substrate was noted in the presence of silanes. Me 3SiC1 proved to be the most effective of the silanes examined for preferential 1,4 enone addition.

A Convenient Synthesis of 1H-1,2,4-Triazol-1-Yl-Propan-3-One Derivatives by Modified Mannich Reaction

Abstract 1H-1,2,4-Triazol-1-yl-propan-3-ones were synthesized regioselectively using a modified Mannich reaction. Reactions of enones and Mannich bases with imidazole are also described.

ChemInform Abstract: The Reaction of Enones with N‐Substituted Hydrazines and N‐Substituted Ureas.

AbstractDie aktivierten Enone (III) reagieren mit Phenylhydrazin (II) zu den Pyrazolen (I); mit Phenylhydrazin‐hydrochlorid oder mit Phenylhydrazin und Natriumhydrid entstehen dagegen die Isomeren (IV).

The Reaction of Enones with N-Subatituted Hydrazines and N-Substituted Ureas

The Reaction of Enones with N-Subatituted Hydrazines and N-Substituted Ureas

Stetter Condensation Catalyzed by a Polymer-Bound Thiazolium Ylide

Abstract 1,4-Diketones are obtained from reaction of enones with aldehydes in the presence of thiazolium ylide linked to a polymer matrix.

Synthesis and Photochemical Behaviour of 2‐Amino‐1,3‐Cyclohexadienes

AbstractThe reaction of the 4,4‐dialkylated 2‐cyclohexenones 1 or 2 with a twofold excess of a secondary amine 3 affords the 2‐amino‐1,3‐cyclohexadienes 4 and 5, respectively. Irradiation (λ ≧ 300 nm) of the morpholino derivative 4a yields a mixture of the isomeric 3‐morpholino‐6‐methyl‐1,3,5‐heptatrienes 6 and 7, while 5 gives only one corresponding product 8. The reaction of enone 1 with an equimolar amount of pyrrolidine (3c) affords the bis‐enamine 9 which is converted to the unsaturated diketone 10 by oxidative hydrolysis.

Reactions of enones with the new organocuprates, lithium trimethyldicuprate, dilithium pentamethyltricuprate, and dilithium trimethylcuprate

Reactions of enones with the new organocuprates, lithium trimethyldicuprate, dilithium pentamethyltricuprate, and dilithium trimethylcuprate