Catalytic Amount Of Trityl Perchlorate Research Articles

ChemInform Abstract: Reactions of α,β-Unsaturated Ketone Acetals with Trimethylsilyl Cyanide and Trimethylsilyl Sulfides.

In the presence of a catalytic amount of trityl perchlorate, trimethylsilyl cyanide reacts with the dimethyl acetals of chalcone derivatives, with simultaneous double bond isomerization, to yield γ-methoxy-α,β-unsaturated carbonitriles. Trimethylsilyl sulfides react with dimethyl acetals derived from α,β-unsaturated ketones to yield 1,3-bis(alkylthio)propene derivatives under similar conditions.

Reactions of α,β-Unsaturated Ketone Acetals with Trimethylsilyl Cyanide and Trimethylsilyl Sulfides

Abstract In the presence of a catalytic amount of trityl perchlorate, trimethylsilyl cyanide reacts with the dimethyl acetals of chalcone derivatives, with simultaneous double bond isomerization, to yield γ-methoxy-α,β-unsaturated carbonitriles. Trimethylsilyl sulfides react with dimethyl acetals derived from α,β-unsaturated ketones to yield 1,3-bis(alkylthio)propene derivatives under similar conditions.

Regioselective Condensation of Ethynyl Vinyl Ketone or 2-Propynyl Ether Derivatives with Silyl Enol Ethers Catalyzed by Trityl Perchlorate

Abstract In the presence of a catalytic amount of trityl perchlorate, ethynyl vinyl ketone derivatives regioselectively react with silyl enol ethers to afford the corresponding Michael adducts in high yields. 2-Propynyl ether derivatives also react with silyl enol ethers in the presence of a catalytic amount of trityl perchlorate, to give the corresponding adducts in high yields. In the case of the reaction with 2-propynyl ether derivatives, regioselectivities were apparently different between two silylated nucleophiles, silyl enol ethers of ketones and ketene silyl acetals.

ChemInform Abstract: Trityl Salt‐Catalyzed Aldol Reaction Between α,β‐Acetylenic Ketones and Silyl Enol Ethers.

AbstractThe α,β‐acetylenic ketones (I) react with the silyl enol ethers (II) in the presence of a catalytic amount of trityl perchlorate to give the isomeric addition products (III) and (IV) with a stereoselectivity in favour of (III).

The Regioselective Addition Reaction of 1,2-Benzoquinones with Silyl Enol Ethers Catalyzed by Trityl Perchlorate

Abstract In the presence of a catalytic amount of trityl perchlorate, 1,2-benzoquinones react with silyl enol ethers to produce the corresponding adducts, homoacyl-pyrocatechol derivatives, regioselectively in good yields.

The Michael Reaction of Various Quinones with Silyl Enol Ethers. A Facile Method for the Preparation of Benzofuran and Indole Derivatives

Abstract In the presence of a catalytic amount of trityl perchlorate, 1,4-benzoquinone, quinone monoimides, or imidoquinones react with silyl enol ethers to produce the corresponding benzofuran or indole derivatives in high yields via the corresponding Michael adducts.

A Facile Synthesis of 1,5-Dienes and β,γ-Unsaturated Nitriles via Trityl Perchlorate-Catalyzed Allylation

Abstract In the presence of a catalytic amount of trityl perchlorate, secondary and tertiary allyl ethers smoothly react with allylsilanes and silyl cyanide to give the corresponding 1,5-dienes and β,γ-unsaturated nitriles, respectively, in good yields.

ChemInform Abstract: A Facile Method for the Oxidation of Aldehydes to Carboxylic Acids via Acetal-Type Diperoxides.

In the presence of a catalytic amount of trityl perchlorate, aldehydes smoothly react with t-butyl trimethylsilyl peroxide to give the acetal-type diperoxides in good yields. Treatment of these diperoxides with piperidine at 90 °C or the aqueous solution of CUSO4 and L-ascorbic acid at room temperature gave the corresponding carboxylic acids in good yields.

A Conjugate Addition of Allylsilanes to α,β-Unsaturated Ketones Catalyzed by Trityl Perchlorate

Abstract A conjugate addition of allylsilanes to α,β-unsaturated ketones was effectively promoted by a catalytic amount of trityl perchlorate to give the corresponding Michael adducts in good yields.

ChemInform Abstract: An Effective Activation of Allyl Methyl Ethers by a Catalytic Amount of Trityl Perchlorate in the Allylation of Silyl Enol Ethers.

AbstractThe methoxy allyl derivatives (I) react with the silylenol ethers (II) in the presence of trityl perchlorate to yield the isomeric adducts (III) and (IV).

ChemInform Abstract: Trityl Perchlorate Catalyzed Tandem Michael‐Aldol Reaction. A Facile Method for the Stereoselective Syntheses of γ‐Acyl Substituted δ‐Hydroxy Ketone Derivatives.

AbstractMit Tritylperchlorat als Katalysator gelingt in einer Eintopf‐Reaktion die Michael‐ Addition der Silylenolether (II) an die ungesättigten Ketone (I) zum Zwischenprodukt (III) und die sofort anschließende Aldol‐ Addition an die Aldehyde (IV), wobei mit ausgezeichneter Diastereoselektivität die anti‐Diastereomeren (V) erhalten werden.

The Double Michael Reaction of α,β-Unsaturated Ketones with Siloxydienes Catalyzed by Trityl Perchlorate Forming Six-Membered Ring Systems

Abstract In the presence of a catalytic amount of trityl perchlorate, the double Michael reaction of α,β-unsaturated ketones with siloxydienes smoothly proceeds to afford six-membered ring systems stereoselectively in good yields. Decalin derivatives are also obtained according to this procedure.

A Convenient Method for the Hydrolysis of Diethylthioacetals Catalyzed by Trityl Perchlorate

Abstract Treatment of diethylthioacetals with two equivalents of trityl methyl ether in the presence of a catalytic amount of trityl perchlorate, and successive quenching with aqueous sodium hydrogencarbonate gave parent carbonyl compounds, hydrolyzed products, in high yields under mild conditions. According to this method, it is also possible to hydrolyze diethylthioacetals selectively even when another thioacetal, such as 1,3-dithiane, coexisted in the same molecule.

A Facile Method for the Oxidation of Aldehydes to Carboxylic Acids via Acetal-type Diperoxides

Abstract In the presence of a catalytic amount of trityl perchlorate, aldehydes smoothly react with t-butyl trimethylsilyl peroxide to give the acetal-type diperoxides in good yields. Treatment of these diperoxides with piperidine at 90 °C or the aqueous solution of CUSO4 and L-ascorbic acid at room temperature gave the corresponding carboxylic acids in good yields.

AN EFFECTIVE ACTIVATION OF ALLYL METHYL ETHERS BY A CATALYTIC AMOUNT OF TRITYL PERCHLORATE IN THE ALLYLATION OF SILYL ENOL ETHERS

Abstract In the presence of a catalytic amount of trityl perchlorate, secondary and tertiary allyl methyl ethers smoothly react with silyl enol ethers to afford the corresponding γ,δ-unsaturated carbonyl compounds in good yields. By the combination of this reaction with the trityl perchlorate catalyzed allylation of acetals γ,δ-unsaturated ketones are synthesized from α,β-unsaturated acetals by a one-pot procedure.

THE STEREOSELECTIVE MICHAEL REACTION BETWEEN SILYL ENOL ETHERS AND α,β-UNSATURATED KETONES BY THE USE OF TRITYL PERCHLORATE AS A CATALYST

Abstract The Michael adducts are obtained with good to excellent ul selectivity by treating silyl enol ethers with α,β-unsaturated ketones in the presence of a catalytic amount of trityl perchlorate.

TRITYL PERCHLORATE CATALYZED TANDEM MICHAEL–ALDOL REACTION. A FACILE METHOD FOR THE STEREOSELECTIVE SYNTHESES OF γ-ACYL SUBSTITUTED δ-HYDROXY KETONE DERIVATIVES

Abstract In the presence of a catalytic amount of trityl perchlorate, the intermediate adducts, produced in situ by the conjugate addition of silyl enol ethers with α,β-unsaturated ketones, react with aldehydes to give the corresponding γ-acyl substituted δ-hydroxy ketone derivatives stereoselectively in high yields. The ketones thus obtained are easily converted to tetrahydropyran derivatives.

ChemInform Abstract: The Trityl Perchlorate Catalyzed Michael Reaction.

AbstractDie zus‐ungesättigten Ketone (I) reagieren mit den Silylenolethern (II) wie angegeben zu den 1,5‐Dicarbonylverbindungen (III).

ChemInform Abstract: A Facile Synthesis of Homoallyl Ethers. The Reaction of Acetals with Allyltrimethylsilanes Promoted by Trityl Perchlorate or Diphenylboryl Triflate.

In the presence of a catalytic amount of trityl perchlorate or diphenylboryl triflate, acetals react smoothly with allyltrimethylsilanes to give the corresponding homoallyl ethers in good yields wi...

A NOVEL AND USEFUL METHOD FOR THE PREPARATION OF METHYL ESTERS FROM DIMETHYL ACETALS

Abstract In the presence of a catalytic amount of trityl perchlorate, acetal-type peroxides are successfully prepared from dimethyl acetals and t-butyl trimethylsilyl peroxide in good yields. The peroxides thus obtained are converted to the corresponding methyl esters also in good yields.