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Relevant academic research and scientific papers

Synthesis of allyl aryl sulfone derivatives from Baylis-Hillman acetates in water

Various phenyl and p-tolyl allyl sulfone derivatives were prepared stereoselectively by reacting Baylis-Hillman acetates with sodium 4-R-benzenesulfinate (R=H, Me) in H2O. The reaction was very efficient in providing the corresponding sulfone d

Ligand-Dependent Regiodivergent Enantioselective Allylic Alkylations of α-Trifluoromethylated Ketones

The asymmetric introduction of the CF3 unit is a powerful tool for modifying pharmacokinetic properties and slowing metabolic degradation in medicinal chemistry. A catalytic and enantioselective addition of α-CF3 enolates allows for expeditious access to

Silver/palladium relay catalyzed 1,3-dipole annulation/allylation reactions to access fully substituted allyl imidazolidines

A silver/palladium relay catalyzed 1,3-dipole annulation/allylation reaction of iminoesters and Baylis-Hillman acetates for the construction of fully substituted allyl imidazolidines is reported. The reaction of both iminoesters and Baylis-Hillman acetate

On the development of a nucleophilic methylthiolation methodology

Methylthiolation reactions are usually explored to access organosulfur compounds using methanethiol, an extremely flammable and toxic compound. Herein, methylthiomethyl esters were successfully applied as novel methylthiolation reagents in a low cost, transition-metal-free methodology. These reagents allowed the methylthiolation of a wide scope of chalcones, acyl ester derivatives and Morita-Baylis-Hillman acetates with good group tolerance, affording the methylthiolated products in moderate to excellent yields. The reaction mechanism was investigated through several control experiments, as well as by theoretical calculations employing Density Functional Theory. The results strongly support that a sulfurane and a sulfonium ylide appear as key intermediates and that a Pummerer type rearrangement is also crucial for the formation of this novel reagent. Furthermore, the methylthiolation mechanism is likely to proceed through the nucleophilic attack of the reagent, followed by an entropically favoured step involving the acetate attack to the positively charged species, then releasing the product. This journal is

A Hydrazine Insertion Route to N′-Alkyl Benzohydrazides by an Unexpected Carbon-Carbon Bond Cleavage

A serendipitous carbon-carbon bond cleavage in the reaction of benzoyl acrylates, derived from Morita-Baylis-Hillman adducts, with hydrazines delivered new N′,N′-disubstituted benzohydrazides. The reaction features a regioselective formation of two carbon

Fe(III)-Catalyzed Hydroallylation of Unactivated Alkenes with Morita-Baylis-Hillman Adducts

An Fe(III)-catalyzed hydroallylation of unactivated alkenes with Morita-Baylis-Hillman adducts via an Fe-catalyzed process is described. A variety of alkenes, including mono-, di-, and trisubstituted alkenes, could all smoothly convert to structural diver

Catalytic Enantioselective Vinylogous Allylic Alkylation of Coumarins

An unprecedented, organocatalytic enantioselective vinylogous γ-allylic alkylation of 4-methylcoumarins has been developed. Using allylic carbonates as the allyl source, this reaction is catalyzed by Lewis basic dimeric Cinchona alkaloid (QD)2P

PYRIDOPYRIMIDINE BASED DERIVATIVES AS POTENTIAL PHOSPHODIESTERASE 3 (PDE3) INHIBITORS AND A PROCESS FOR THE PREPARATION THEREOF

The present invention provides compounds of formula 1 as potential phosphodiesterase3 (PDE3) inhibitory agents and a process for the preparation thereof. The derivatives of formula 1 can be employed as therapeutics in human and veterinary medicine, where

INDOLIZINONE BASED DERIVATIVES AS POTENTIAL PHOSPHODIESTERASE 3 (PDE3) INHIBITORS AND A PROCESS FOR THE PREPARATION THEREOF

The present invention provides compounds of general formula A useful as potential phosphodiesterase3 (PDE3) inhibitory agents and a process for the preparation thereof. The derivatives of formula A can be employed as therapeutics in human and veterinary medicine, where they can be used, for example, for the treatment and prophylaxis of the following diseases: heart failure, dilated cardiomyopathy, platelet inhibitors, cancer and obstructive pulmonary diseases.

Synthesis of 1-benzhydryl piperazine derivatives and evaluation of their ACE inhibition and antimicrobial activities

This study presents the synthesis of 14 new 1,4-disubstituted piperazine derivatives from allyl bromides of Baylis-Hillman adduct and 4,4-disubstituted benzhydryl piperazines. All the synthesized compounds were further screened for in vitro ACE inhibitor and antimicrobial activities. Among the synthesized piperazine derivatives, compound 12h showed moderate ACE inhibitor activity as compared to the standard, angiotensin-converting enzyme inhibitor (Sigma). The kinetic data (K m, K i and V max values) of enzyme inhibition for compound 12h and ACE inhibitor standard were also determined. Similarly, all compounds were screened against different bacterial strains. Compounds 12a, 12b, 12d, 12h and 12i showed excellent to moderate activity against various tested bacterial strains. Compounds 12b and 12i showed broad spectrum of antibacterial activity against Pseudomonas aeruginosa, Staphylococcus aureus, S. aureus MLS 16, Escherichia coli, Bacillus subtilis and Klebsiella planticola, while compounds 12a, 12d and 12i showed promising activity against P. aeruginosa (MIC value of 8.96 μM), S. aureus (MIC value of 42.2 μM) and S. aureus MLS 16 (MIC value of 81.3 μM), respectively. The remaining compounds showed activity at a concentration of >491 μM.