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Palladium-Catalyzed ?-Arylation of ?-Keto Esters.

ABSTRACT: A catalyst system derived from commercially available Pd2(dba)3 and PtBu3 has been applied to the coupling of ?-keto ester enolates and aryl bromides. The reaction provides access to an array of ?-stereogenic ?-keto esters. When the air-stable ligand precursor PtBu3·HBF4 is employed, the reaction can be carried out without use of a glovebox. The derived products are of broad interest given the prevalence of the ?-keto acid substructure in biologically important molecules.

SUBMITTER: Zavesky BP

PROVIDER: S-EPMC5598777 | BioStudies | 2017-01-01

REPOSITORIES: biostudies

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Project description:BACKGROUND:Pyrazolones are traditionally synthesized by the reaction of ?-keto esters with hydrazine and its derivatives. There are methods to synthesize ?-keto esters from esters and aldehydes, but these methods have main limitation in varying the substituents. Often, there are a number of methods such as acylation of enolates in which a chelating effect has been employed to lock the enolate anion using lithium and magnesium salts; however, these methods suffer from inconsistent yields in the case of aliphatic acylation. There are methods to synthesize ?-keto esters from ketones like caboxylation of ketone enolates using carbon dioxide and carbon monoxide sources in the presence of palladium or transition metal catalysts. Currently, the most general and simple method to synthesize ?-keto ester is the reaction of dimethyl or ethyl carbonate with ketone in the presence of strong bases which also requires long reaction time, use of excessive amount of reagent and inconsistent yield. These factors lead us to develop a simple method to synthesize ?-keto esters by changing the base and reagent. RESULTS:A series of ?-keto esters were synthesized from ketones and ethyl chloroformate in the presence of base which in turn are converted to pyrazolones and then subjected to cytotoxicity studies towards various cancer cell lines and antimicrobial activity studies towards various bacterial and fungal strains. CONCLUSION:The ?-keto esters from ethyl chloroformate was successfully attempted, and the developed method is simple, fast and applicable to the ketones having the alkyl halogens, protecting groups like Boc and Cbz that were tolerated and proved to be useful in the synthesis of fused bicyclic and tricyclic pyrazolones efficiently using cyclic ketones. Since this method is successful for different ketones, it can be useful for the synthesis of pharmaceutically important pyrazolones also. The synthesized pyrazolones were subjected to antimicrobial, docking and cytotoxicity assay against ACHN (human renal cell carcinoma), Panc-1 (human pancreatic adenocarcinoma) and HCT-116 (human colon cancer) cell line, and lead molecules have been identified. Some of the compounds are found to have promising activity against different bacterial and fungal strains tested.

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Palladium-Catalyzed ?-Arylation of ?-Keto Esters.

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