Menthyl carbamate compounds as skin and/or hair lightening actives
The present invention relates to the cosmetic, dermatological or pharmaceutical (therapeutic) use of compounds of formula (I) or a cosmetically acceptable salt of a compound of formula (I) or a mixture containing two or more of these compounds or the salts thereof wherein R 1 denotes hydrogen or an organic radical having 1 to 14 carbon atoms, R 2 denotes an organic radical having 1 to 14 carbon atoms, and wherein optionally R 1 and R 2 are covalently bonded to one another, preferably so that a 3 to 8 membered ring is formed, for the lightening of skin and/or hair. The invention further relates to compositions and cosmetic, dermatological or pharmaceutical preparations (compositions) comprising one or more compounds of formula (I) suitable for lightening human skin and/or hair and corresponding methods. The invention further relates to compounds of formula (I) as a drug, their use for the preparation of a pharmaceutical composition for lightening human skin and/or hair and to certain novel compounds of formula (I).
1. A cosmetic or pharmaceutical composition for lightening of skin and/or hair, comprising
(a) 0.001 wt. % to 30 wt. % of one or more compounds selected from the group consisting of
or a cosmetically acceptable salt thereof;
and
(b) 0.01 wt. % to 30 wt. % of one or more further active ingredients for skin and/or hair lightening suitable for cosmetic or pharmaceutical application selected from the group consisting of kojic acid (5-hydroxy-2-hydroxymethyl-4-pyranone), kojic acid derivatives, arbutin, ascorbic acid, ascorbic acid derivatives, hydroquinone, hydroquinone derivatives, resorcinol, resorcinol derivatives, sulfur-containing molecules, alpha-hydroxy acids, salts and esters thereof, tyrosinase inhibitors, N-acetyl tyrosine and derivatives, undecenoyl phenylalanine, gluconic acid, chromone derivatives, zinc salts, thujaplicin and derivatives, triterpenes, sterols, benzofuranones, vinyl guiacol, ethyl guiacol, dionic acids, inhibitors of nitrogen oxide synthesis, 2,7-dinitroindazole or thiocitrulline, metal chelators, retinoids, soy milk and extract, serine protease inhibitors or lipoic acid or other synthetic or natural active ingredients for skin and hair lightening.
2. A composition according to claim 1 , wherein the one or more further active ingredients for skin and/or hair lightening of component (b) are selected from the group consisting of kojic acid, phenylethyl resorcinol, beta- and alpha-arbutin, hydroquinone, nicotinamide, dioic acid, Mg ascorbyl phosphate and vitamin C and its derivatives, mulberry extract, Bengkoang extract, papaya extract, turmeric extract, nutgrass extract, licorice extract (containing glycyrrhizin), alpha-hydroxy-acids, 4-alkylresorcinols, and 4-hydroxyanisole.
3. A composition according to claim 1 , wherein the one or more further active ingredients for skin and/or hair lightening of component (b) are tyrosinase inhibitors.
4. A composition according to claim 1 , additionally comprising
one or more agents selected from the group of substances which absorb or reflect UV radiation, and/or
one or more agents selected from the group of anti-irritants and anti-inflammatory substances, and/or
one or more agents selected from the group of antioxidants.
5. A composition according to claim 4 , wherein the composition comprises 0.01 wt. % to 40 wt. % of one or more agents selected from the group of substances which absorb or reflect UV radiation.
6. A compound selected from the group consisting of:
or a cosmetically acceptable salt thereof.
7. A method for the cosmetic lightening of skin and/or hair, comprising:
application to the skin and/or hair a cosmetically effective amount of a composition as defined in claim 1 .
8. A drug for lightening skin and/or hair, or for treating hyperpigmentation, comprising a composition as defined in claim 1 .
9. A pharmaceutical composition comprising a pharmaceutically active amount of one or more compounds of claim 6 , and/or a cosmetically acceptable salt thereof, for lightening skin and/or hair, or for treating hyperpigmentation.
10. A method of lightening skin and/or hair, comprising:
application of a pharmaceutically effective amount of a composition according to claim 1 to the skin and/or hair.
11. A method for lightening the skin and/or hair comprising applying to the skin and/or hair one or more compounds of claim 6 , and/or a cosmetically acceptable salt thereof.
12. A composition according to claim 5 , wherein
the total quantity of the one or more compounds of (a) and/or pharmaceutically acceptable salts thereof is in the range of from 0.01 wt. % to 20 wt. %, and/or
the total quantity of further active ingredients for skin and/or hair lightening of component (b) is in the range of from 0.01 wt. % to 20 wt. %, and/or
the total quantity of substances which absorb or reflect UV radiation is in the range of from 0.1 wt. % to 30 wt. %,
in each case based on the total weight of the composition.
13. A composition according to claim 5 , wherein
the total quantity of the one or more compounds of (a) and/or pharmaceutically acceptable salts thereof is in the range of from 0.01 wt. % to 5 wt. %, and/or
the total quantity of further active ingredients for skin and/or hair lightening of component (b) is in the range of from 0.01 wt. % to 5 wt. %, and/or
the total quantity of substances which absorb or reflect UV radiation is in the range of from 1.0 wt. % to 10.0 wt. %,
in each case based on the total weight of the composition.