The present invention relates to derivatives of the 1H-pyrano[4,3-b]benzofuran-1-one structure and their nitrogen analogues which possess powerful antioxidant properties combined with a highly effective UV absorbing functionality in one molecule. These compounds are especially useful in cosmetical and dermatological formulations.
[EN] COUMESTAN-LIKE ANTIOXIDANTS AND UV ABSORBANTS<br/>[FR] ANTIOXYDANTS DE TYPE PHYTOESTROGÈNE ET ABSORBANTS D'UV
申请人:CIBA HOLDING INC
公开号:WO2008110465A1
公开(公告)日:2008-09-18
[EN] The present invention relates toderivatives of the 1H-pyrano[4,3-b]benzofuran-1-one structure and their nitrogen analogueswhichpossess powerful antioxidant properties combined with a highly effective UV absorbing functionality in one molecule.These compounds are especially useful in cosmetical and dermatological formulations. [FR] La présente invention concerne des dérivés de la structure 1H-pyrano[4,3-b]benzofuran-1-one et de leurs analogues d'azote qui possèdent de puissantes propriétés antioxydantes associées à une propriété d'absorption des UV très efficace dans une même molécule. Ces composés sont particulièrement utiles dans des préparations cosmétiques et dermatologiques.
Pd-catalysed regioselective C–H functionalisation of 2-pyrones
作者:Michael J. Burns、Robert J. Thatcher、Richard J. K. Taylor、Ian J. S. Fairlamb
DOI:10.1039/c0dt00421a
日期:——
A new synthetic methodology for the catalytic CâH functionalisation of 2-pyrones is described which proceeds regioselectively at the C3 position, mirroring the observed regioselectivity in 6Ï-electrocyclisation/oxidative aromatisation reactions of related compounds. Insight into the reaction mechanism is provided, with support for a neutral palladium(II) pathway. Cationic palladium(II) complexes possessing 2-pyrones are unstable and readily undergo PdIIâP transfer at ambient temperature resulting in phosphonium salt formation (and Pd0Ln species).