申请人:Hanyu Naoto
公开号:US20110003817A1
公开(公告)日:2011-01-06
The present invention provides a compound having an excellent inhibitory action on melanin production and being useful as a whitening agent, and a skin external preparation containing the compound. The whitening agent of the present invention comprises, as an active ingredient, a compound represented by formula (1) or a pharmacologically acceptable salt thereof:
wherein X
1
, X
2
, and X
3
are each CR
2
or N; R
1
, R
2
, and R
3
are each H, C
1-6
alkyl, C
1-6
alkoxy, SH, OH, or NR
b
R
c
, wherein R
b
and R
c
are each H, C
1-6
alkyl, or hydroxy-C
1-6
alkyl, or NR
b
R
c
forms a saturated or unsaturated 5- or 6-membered hetero ring; and B is a substituted or unsubstituted pyrazole, imidazole, pyridine, or piperidine; with the proviso that at least one of R
1
, R
3
, R
4
, and R
6
is a group other than C
1-3
alkyl in the case where X
1
═X
2
═Y
1
═N and X
3
═CR
2
.
本发明提供一种具有优异的抑制黑色素生成作用并可用作美白剂的化合物,以及含有该化合物的皮肤外用制剂。本发明的美白剂包含以下化合物作为活性成分,或其药学上可接受的盐:式(1)所示的化合物,其中X1、X2和X3分别为CR2或N;R1、R2和R3分别为H、C1-6烷基、C1-6烷氧基、SH、OH或NRbRc,其中Rb和Rc分别为H、C1-6烷基或羟基-C1-6烷基,或NRbRc形成饱和或不饱和的5-或6-成员杂环;B是取代或未取代的吡唑、咪唑、吡啶或哌啶;但是,在X1═X2═Y1═N且X3═CR2的情况下,R1、R3、R4和R6中至少有一个是除C1-3烷基外的基团。