[EN] POLYMERIZABLE FUSED TRICYCLIC COMPOUNDS AS ABSORBERS OF UV AND VISIBLE LIGHT<br/>[FR] COMPOSÉS TRICYCLIQUES FUSIONNÉS POLYMÉRISABLES EN TANT QU'ABSORBEURS DE LUMIÈRE UV ET VISIBLE
申请人:JOHNSON & JOHNSON VISION CARE
公开号:WO2020261021A1
公开(公告)日:2020-12-30
Described are polymerizable fused tricyclic compounds of formula I: wherein R1, R2, R3, m, n, t, and rings B, C, and D are as defined herein. The compounds absorb various wavelengths of ultraviolet and/or visible light (such as high energy visible light) and are suitable for incorporation in a variety of products, such as biomedical devices and ophthalmic devices.
A general protocol for direct chalcogenation of inert C-H bonds of (hetero)aromatic carboxylic acids is developed with a ruthenium(II) catalyst using readily available starting materials, offering densely substituted ortho-chalcogenyl aromatic acids in high yields (up to 96%). The strategy avoids the installation of an external directing group, use of metallic oxidants, and features operational simplicity with ample substrate scope. Synthetic application :en route to biologically important chalcogenoxanthones is also demonstrated. This work represents the first example of ruthenium(II)-catalyzed direct C-H chalcogenation of benzoic acids.
Application of regioselective thiophene lithiation to the synthesis of thiophene analogs of xanthones and thioxanthones
作者:Jeffrey W. H. Watthey、Mahesh Desai
DOI:10.1021/jo00348a032
日期:1982.4
BEELITZ K.; BUCHHOLZ G.; PRAEFCKE K., LIEBIGS ANN. CHEM., 1979, NO 12, 2043-2056