Pigmentation of human skin and/or hair is promoted by administering to individuals in need of such treatment, advantageously topically, an effective tyrosinase activity-stimulating amount of at least one 6-substituted pyrimidine 3-oxide having the structural formula (I):
1
in which R
1
and R
2
, which may be identical or different, are each a hydrogen atom or a C
1
-C
12
alkyl radical; and R
3
and R
4
, which may be identical or different, are each a C
1
-C
12
alkyl radical or, when taken together, form a heterocycle with the nitrogen atom from which they depend, with the proviso that, when R
3
and R
4
, taken together, form a piperidino ring, then at least one of the radicals R
1
or R
2
must be other than a hydrogen atom.
通过向需要治疗的个体局部施用有效量的至少一种结构式为(I)的 6-取代
嘧啶 3-氧化物,可有效刺激
酪氨酸酶的活性,从而促进人类皮肤和/或毛发的色素沉着:
1
其中 R
1
和 R
2
可以相同或不同,各自为氢原子或 C
1
-C
12
烷基;以及 R
3
和 R
4
可以相同或不同,各自是一个 C
1
-C
12
烷基,或当它们组合在一起时,与它们所依附的氮原子形成一个杂环,但当 R
3
和 R
4
合在一起形成一个
哌啶环时,则至少有一个基 R
1
或 R
2
必须不是氢原子。