We present a method for synthesizing -benzyl pyridones from -quinone methides (-QMs) and 2- or 4-hydroxy pyridines in the presence of a base at room temperature. The reaction proceeds through 1,6-Michael addition reaction. Simple operation, good to excellent yields, broad substrate scope, and good functional group tolerance are the salient features of the developed methodology. The synthesized -benzyl pyridones displayed significant blood-stage antiplasmodial activity at sub-micromolar concentration.
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http://dx.doi.org/10.1039/d4ob01686f | DOI Listing |
Molecules
November 2024
Department of Organic and Physical Chemistry, Faculty of Chemical Technology and Engineering, West Pomeranian University of Technologyin Szczecin, Al. Piastów 42, 71-065 Szczecin, Poland.
A method for the synthesis of C4-benzhydryl-functionalized 3,4-dihydropyridin-2-ones using complementary addition of benzhydryllithium and/or benzhydrylmagnesiate reagents to 2-pyridones, with high regioselectivity triggered by substituents, is described. A partially stereoselective cyclization was successfully demonstrated using TfOH and/or TIPSOTf as Brønsted and Lewis acids, respectively, leading to C6-phenyl-functionalized 7,8-benzomorphanones. It is also shown that the use of functionalized δ-enelactams obtained with an active methoxy-substituted benzyl group at C3 enabled the preparation of a new C3-C6 bridged system within the δ-lactam framework.
View Article and Find Full Text PDFOrg Biomol Chem
January 2025
Department of chemistry, Pondicherry University, Puducherry-605014, India.
We present a method for synthesizing -benzyl pyridones from -quinone methides (-QMs) and 2- or 4-hydroxy pyridines in the presence of a base at room temperature. The reaction proceeds through 1,6-Michael addition reaction. Simple operation, good to excellent yields, broad substrate scope, and good functional group tolerance are the salient features of the developed methodology.
View Article and Find Full Text PDFChem Sci
September 2024
The Scripps Research Institute (TSRI) 10550 North Torrey Pines Road, La Jolla CA 92037 USA
The transition metal-catalyzed -C-H functionalization of alcohols and their hydroxylamine derivatives remains underdeveloped. Herein, we report an efficient -C-H arylation of both phenylethyl and benzylic alcohols and their hydroxylamine derivatives using a readily removable oxime ether directing group. Using electronically activated 2-carbomethoxynorbornene as the transient mediator and 3-trifluoromethyl-2-pyridone as the enabling ligand, this reaction features a broad substrate scope and good functional group tolerance.
View Article and Find Full Text PDFBiochem Pharmacol
July 2024
Department of Nephrology, Xiangya Hospital, Central South University, Changsha 410008, China; Hunan Key Lab of Organ Fibrosis, Changsha 410008, China; National International Collaborative Research Center for Medical Metabolomics, Xiangya Hospital, Central South University, Changsha 410008, China. Electronic address:
Org Lett
April 2024
School of Chemistry, Indian Institute of Science Education and Research Thiruvananthapuram, Vithura, Kerala 695551, India.
We demonstrate a ligand- and glovebox-free regioselective direct C(3)-H imidation of 2-pyridones and also benzylic-type imidation of 2-pyridones bearing a methyl substituent employing Cu(OAc)·HO as the catalyst and -fluorobenzenesulfonimide (NFSI) as an imidating reagent. A broad range of imidated 2-pyridone derivatives is made up to excellent yields. The present strategy operates well on a gram scale, and the ensuing product can be readily subjected to - and -desulfonylation reactions.
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