One Facile Preparation of N‐Aroyl‐N′‐arylsulfonylhydrazines by Oxidation of Aromatic Aldehyde N‐Arylsulfonylhydrazones with bis(Trifluoroacetoxy)iodobenzene

N‐aroyl‐N′‐arylsulfonylhydrazines can be obtained by oxidation of aromatic aldehyde N‐arylsulfonylhydrazones with bis(trifluoroacetoxy)iodobenzene in acetone at room temperature in mild to good yields.     

Organic Reactions in Ionic Liquids: Ionic Liquid Ethylammonium Nitrate–Promoted Knoevenagel Condensation of Meldrum's Acid With Aromatic Aldehydes

The Knoevenagel condensation of Meldrum's acid with aromatic aldehydes proceeded efficiently in a reusable ionic liquid, ethylammonium nitrate, at room temperature in the absence of any catalyst with high yields.     

Synthesis of Aromatic Aldehydes by a Fast Method Involving Kornblum's Reaction

Aromatic aldehydes were synthesized by oxidation of corresponding halides with dimethyl sulfoxide on potassium bicarbonate by microwave irradiation. Short reaction time and high yields were obtained.     

[emim]BF4‐Promoted Chloromethylation of Aromatic Hydrocarbons

The chloromethylation of aromatic hydrocarbons proceeded efficiently using the reusable ionic liquid [emim]BF₄ as promoter. The reactions were completed in 5 h at 70°C with good yields and easy workup.     

A Practical Knoevenagel Condensation Catalyzed by PEG400 and Anhydrous K2CO3 Without Solvent

Abstract

Knoevenagel condensation of aromatic aldehydes with active methylene compounds under solvent‐free conditions to synthesize arylidene compounds in good to excellent yields using powdered anhydrous K₂CO₃ and PEG400 as catalysts has been described.     

Facile Method for One-Step Synthesis of 2,4,5-Triarylimidazoles Under Catalyst-Free,Solvent-Free,and Microwave-Irradiation Conditions

A green and efficient method for the synthesis of 2,4,5-triarylimidazoles by one-step condensation reaction of benzil, aromatic aldehyde, and ammonium acetate under catalyst-free, solvent-free, and microwave-irradiation conditions is reported. This method had many dramatic advantages, such as the short reaction time (3–5 min), good yields (80–99%), environmental friendliness, and convenient operation.     

5-Amino-4-Cyano-1-(Hetero)Arylimidazoles

5-Amino-4-cyano-1-(hetero)arylimidazoles 1 are prepared by reaction of N-(hetero)arylformimidoethylesters 2 with 2-aminomalodinitrile in acetic acid.     

REGIOSELECTIVE NITRATION OF 1-ACYL-4-METHOXYINDOLINES LEADS TO EFFICIENT SYNTHESIS OF A PHOTOLABILE l-GLUTAMATE PRECURSOR

ABSTRACT

Different nitrating reagents give different ratios of 5- and 7-nitro isomers of the title indolines. The best ratio of the 7-nitro isomer was obtained with claycop–acetic anhydride, and these conditions were particularly useful for preparation of a photolabile l-glutamate derivative.     

Synthetic Approach to 4a-Methyltetrahydrofluorene-Type Diterpenoids via an Aromatic Oxidation of Phenol Derivatives

An intramolecular aromatic oxidation of a phenolic compound with a hypervalent iodine reagent afforded the coupling product, in which the coupling took place at the para-position of the methoxy goup of the starting material instead of the desired para-position of the isopropenyl group, unfortunately.