Pd(II)-Catalyzed ortho-C–H Oxidation of Arylacetic Acid Derivatives: Synthesis of Benzofuranones
摘要:
Pd(II)-catalyzed ortho-C-H acetoxylation of arylacetic acid derivatives is demonstrated with the aid of a novel S-methyl-S-2-pyridylsulfoximine (MPyS) directing group (DG). The alpha-mono- and alpha-unsubstituted arylacetic acid derivatives were readily employed in the ortho-C-H acetoxylations. The oxidation products are hydrolyzed, and the MPyS-DG is easily recovered, providing ready access to 0-hydroxyarylacetic acids. 3-Mono- and 3-unsubstituted benzofuranones are synthesized from 0-hydroxyarylacetic acids.
LIGAND-ENABLED SCALABLE C-H HYDROXYLATION OF BENZOIC AND PHENYLACETIC ACIDS AT ROOM TEMPERATURE
申请人:[en]THE SCRIPPS RESEARCH INSTITUTE
公开号:WO2024054881A1
公开(公告)日:2024-03-14
The application discloses industry scalable methods of using bifunctional bidentate pyridone-carboxylic acid ligands, such as 2-methyl-2-(6-oxo-1,6-dihydropyridin-2-yl)propanoic acid, that enable room-temperature Pd-catalyzed C-H hydroxylation of a broad range of benzoic and phenylacetic acids with an industry-compatible oxidant, aqueous hydrogen peroxide, at room temperature. Further disclosed are methods of derivatization of the resulting hydroxylation products, synthesis of polyfluorinated natural products coumestan or pterocarpene from phenol building blocks, and hydroxylation of ibuprofen using this methodology,