申请人:Harichian Bijan
公开号:US20050191250A1
公开(公告)日:2005-09-01
Disclosed are coumarin derived compounds of formula I as skin lightening agents alone or in combination with other skin benefit agents and together with a cosmetic vehicle:
Where each or both R
1
and/or R
2
represents hydrogen (H); linear or branched, saturated or unsaturated C
1
-C
12
alkyl, alkenyl, acyl, or heteroalkyl (preferably, alkoxy) groups; and
R
3
represents linear or branched, cyclic or acyclic, saturated or unsaturated C
1
-C
12
alkyl, alkenyl, cycloalkyl, cycloalkenyl, or heteroalkyl group; and
R
4
represents a hydrogen atom (H); straight or branched, cyclic or acyclic, saturated or unsaturated, containing or not containing a heteroatom C
1
-C
22
alkyl, alkenyl, cycloalkyl, cycloalkenyl, heteroalkyl, aryl, or heteroaryl group. In a most preferred embodiment, each R
1
, R
2
and R
4
represent H, while R
3
represents a methyl group, referred to herein as a 4-methyl 7-hydroxy-coumarin derivative, or coumarin derived resorcinol derivative, which may be prepared by catalytic (nickel or paladium catalyst) hydrogenation of 4-methyl 7-hydroxy-coumarin followed by hydrolysis. The inventive compounds, compositions and methods have effective skin lightening properties, may be less irritating to the skin, and are cost-effective and relatively simple to manufacture. Also disclosed are processes for making the inventive compounds of general formula I from 4-substituted-7-hydroxy coumarin derivatives.
揭示了一种公式I的香豆素衍生化合物,作为皮肤美白剂,可以单独使用或与其他皮肤益处剂以及化妆品载体结合使用:其中R1和/或R2表示氢(H);线性或支链的,饱和或不饱和的C1-C12烷基,烯基,酰基或杂烷基(优选为烷氧基)基团;R3表示线性或支链的,环状或非环状的,饱和或不饱和的C1-C12烷基,烯基,环烷基,环烯基或杂烷基基团;R4表示氢原子(H);直链或支链的,环状或非环状的,饱和或不饱和的,含有或不含有杂原子的C1-C22烷基,烯基,环烷基,环烯基,杂烷基,芳基或杂芳基基团。在最优选的实施方式中,每个R1,R2和R4代表H,而R3代表一个甲基基团,这里称为4-甲基7-羟基香豆素衍生物,或香豆素衍生的邻苯二酚衍生物,可以通过对4-甲基7-羟基香豆素进行催化(镍或钯催化剂)氢化后接着水解制备得到。这些创新的化合物、组合物和方法具有有效的皮肤美白性能,可能对皮肤刺激较小,并且在制造上具有成本效益且相对简单。还公开了从4-取代-7-羟基香豆素衍生物制备一般公式I的创新化合物的方法。