Reactions of alkyl 4-aminobenzoates with maleic anhydride give the corresponding alkyl 4-(2,5-di-oxo-2,5-dihydro-1H-pyrrol-1-yl)benzoates, and the latter are converted into 4-(3-dialkylamino-2,5-dioxo-2,3,4,5-tetrahydro- 1H-pyrrol-1-yl)benzoates by treatment with secondary amines.
Reactions of alkyl 4-aminobenzoates with maleic anhydride give the corresponding alkyl 4-(2,5-di-oxo-2,5-dihydro-1H-pyrrol-1-yl)benzoates, and the latter are converted into 4-(3-dialkylamino-2,5-dioxo-2,3,4,5-tetrahydro- 1H-pyrrol-1-yl)benzoates by treatment with secondary amines.
COMPOUNDS CONTAINING A MICHAEL-ACCEPTOR, ESPECIALLY MALEIMIDE OR MALEIC ACID DERIVATIVES, DIRECTLY OR INDIRECTLY LINKED TO A CHROMOPHORE AND THEIR USE IN LONG LASTING SUNSCREEN COMPOSITIONS
申请人:Vanguard Medica Limited
公开号:EP0758314B1
公开(公告)日:1999-09-15
US5877204A
申请人:——
公开号:US5877204A
公开(公告)日:1999-03-02
[EN] COMPOUNDS CONTAINING A MICHAEL-ACCEPTOR, ESPECIALLY MALEIMIDE OR MALEIC ACID DERIVATIVES, DIRECTLY OR INDIRECTLY LINKED TO A CHROMOPHORE AND THEIR USE IN LONG LASTING SUNSCREEN COMPOSITIONS<br/>[FR] COMPOSES CONTENANT UN ACCEPTEUR DE MICHAEL, PARTICULIEREMENT DES DERIVES DE MALEIMIDE OU D'ACIDE MALEIQUE, LIE DIRECTEMENT OU INDIRECTEMENT A UN CHROMOPHORE ET LEUR UTILISATION DANS DES COMPOSITIONS DURABLES D'ECRAN TOTAL
申请人:VANGUARD MEDICA LIMITED
公开号:WO1995030646A1
公开(公告)日:1995-11-16
(EN) The present invention relates to compounds which are useful as sunscreens. The compounds persists on the skin for much longer than conventional sunscreens because they comprise a Michael acceptor linked directly or indirectly to a chromophore. The Michael acceptor is capable of undergoing a conjugate addition reaction with thiol groups present in cysteine residues of keratin and thus the compound is chemically bound to the skin and will not be removed by immersion in water.(FR) L'invention concerne des composés efficaces en tant qu'écran total. Ces composés restent sur la peau beaucoup plus longtemps que les produits classiques d'écran total, étant donné qu'ils comprennent un accepteur de Michael lié directement ou indirectement à un chromophore. L'accepteur de Michael est capable de subir une réaction d'addition conjugée avec des groupes thiol présents dans des résidus de cystéine de kératine et, de ce fait, le composé se fixe chimiquement à la peau et restera insensible à l'immersion dans l'eau.
Reactions of alkyl 4-aminobenzoates with maleic anhydride give the corresponding alkyl 4-(2,5-di-oxo-2,5-dihydro-1H-pyrrol-1-yl)benzoates, and the latter are converted into 4-(3-dialkylamino-2,5-dioxo-2,3,4,5-tetrahydro- 1H-pyrrol-1-yl)benzoates by treatment with secondary amines.