Derivatives of 2,5-dihydroxyphenylcarboxylic acid
    1.
    发明授权
    Derivatives of 2,5-dihydroxyphenylcarboxylic acid 失效
    2,5-二羟基苯基羧酸的衍生物

    公开(公告)号:US5637756A

    公开(公告)日:1997-06-10

    申请号:US444275

    申请日:1995-05-18

    摘要: A cosmetic or dermatological composition with a depigmenting action comprises derivatives of 2,5-dihydroxyphenylcarboxylic acids, their homologs, and their salts, with the derivatives having the following structural formula: ##STR1## wherein: R.sub.1 represents OR.sub.5, OH, or ##STR2## R.sub.5 is a linear or branched C.sub.1 -C.sub.20 alkyl radical, a linear or branched C.sub.2 -C.sub.20 alkenyl radical, or a C.sub.1 -C.sub.20 alkyl radical substituted by one or more hydroxy or alkoxy groups; r' and r", identical or different, represent a hydrogen atom, a C.sub.1 -C.sub.20 alkyl radical, a C.sub.2 -C.sub.6 hydroxyalkyl radical, or a C.sub.3 -C.sub.6 polyhydroxyalkyl, or r' and r" taken together, with the nitrogen atom, form a heterocycle;the number of carbon atoms in the --(CH.sub.2).sub.n --COR.sub.1 chain is less than or equal to 21;R.sub.2 and R.sub.3, identical or different, represent a hydrogen atom, a linear or branched C.sub.1 -C.sub.4 alkyl radical, or a C.sub.1 -C.sub.4 alkoxy; R.sub.4 represents a hydrogen atom or a linear or branched C.sub.1 -C.sub.4 alkyl radical; andn is an integer from 0 to 20, provided that, when R.sub.2 and R.sub.3 represent a hydrogen atom, n is greater than or equal to 2.

    摘要翻译: 具有脱色作用的化妆品或皮肤病学组合物包括2,5-二羟基苯基羧酸的衍生物,它们的同系物及其盐,其衍生物具有以下结构式:其中:R1表示OR5,OH或 R 5是直链或支链C 1 -C 20烷基,直链或支链C 2 -C 20烯基或被一个或多个羟基或烷氧基取代的C 1 -C 20烷基; r'和r“相同或不同,表示氢原子,C1-C20烷基,C2-C6羟基烷基或C3-C6多羟基烷基,或r'和r”与氮 原子,形成杂环; - (CH2)n-COR1链中的碳原子数小于或等于21; R2和R3相同或不同,表示氢原子,直链或支链C 1 -C 4烷基或C 1 -C 4烷氧基; R4表示氢原子或直链或支链C1-C4烷基; 并且n为0至20的整数,条件是当R 2和R 3表示氢原子时,n大于或等于2。