Classifications

• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07F—ACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAINING ELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN, SULFUR, SELENIUM OR TELLURIUM
  • C07F7/00—Compounds containing elements of Groups 4 or 14 of the Periodic Table
  • C07F7/02—Silicon compounds
  • C07F7/08—Compounds having one or more C—Si linkages
  • C07F7/0803—Compounds with Si-C or Si-Si linkages
  • C07F7/081—Compounds with Si-C or Si-Si linkages comprising at least one atom selected from the elements N, O, halogen, S, Se or Te
  • C07F7/0812—Compounds with Si-C or Si-Si linkages comprising at least one atom selected from the elements N, O, halogen, S, Se or Te comprising a heterocyclic ring
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
  • A61P17/00—Drugs for dermatological disorders
  • A61P17/16—Emollients or protectives, e.g. against radiation
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
  • A61P17/00—Drugs for dermatological disorders
  • A61P17/18—Antioxidants, e.g. antiradicals

Definitions

• the present invention relates to novel silane esters and amides of 2-oxothiazolidine-4-carboxylic 5 acid, to cosmetic compositions containing them and to the cosmetic uses thereof.
• UVB is responsible for erythema and impairments of
• UVA is responsible for the vast majority of solar allergies and of oxidative damage on account of its capacity to form activated oxygen species, which are capable of reacting
• UVA- and UVB-screening agents that absorb the energy provided by the photons or scatter
• X denotes an oxygen atom or a group NRi
• Y denotes a radical (-CH 2 ) n ⁇ or -CH- (SiR' 2 R' 3 R' 4) -;
• Ri and R 5 independently denote a hydrogen atom; a linear or branched C1-C2 0 alkyl group; or an acyl group whose alkyl chain contains from 1 to 10 carbon atoms;
• R2/ R-3 > B-4/ R' 2/ R' 3 and R' 4 independently denote a linear or branched C 1 -C 20 alkyl group; n is an integer ranging from 1 to 10.
• Alkyl groups that may be mentioned include methyl, ethyl, propyl, isopropyl, butyl, isobutyl, pentyl, hexyl, heptyl, octyl, nonyl, decyl, undecyl, dodecyl, tridecyl, tetradecyl, pentadecyl, hexadecyl, heptadecyl, octadecyl, nonadecyl and eicosyl groups.
• Acyl groups that may be mentioned in particular include acetyl, propionyl and butanoyl groups.
• the compounds of formula (I) may be in the form of optically pure isomers (S or R form) or in the form of a mixture thereof in any proportion, in particular a racemic mixture.
• the compounds of formula (I) that are in the form of the R (or L) isomer are preferred.
• X is an oxygen atom or a group NRi in which Ri denotes a Ci-C 3 alkyl radical or, preferably, a hydrogen atom; and/or
• R 2 , R 3 and R 4 are identical or different C1-C 3 alkyl radicals; and/or
• R' 2, R' 3 and R' 4 are identical or different C1-C3 alkyl radicals or n is an integer ranging from 1 to 3; and/or
• R 5 H.
• C 1 -C 3 alkyl radicals that may be mentioned include methyl, ethyl, propyl and isopropyl groups.
• This is methyltrimethylsilyl R-2-oxo-l, 3- thiazolidine-4-carboxylate of formula (1) :
• the compounds in which X is an oxygen atom may be prepared according to a standard esterification reaction between the 2-oxothiazolidine carboxylate obtained in basic medium (for example by reacting with K2CO3 m N-methylpyrrolidone or dimethylformamide) and a corresponding alkylsilane halide, or alternatively between the 2-oxothiazolidine-4-carboxylic acid and the corresponding silyl alcohol, by analogy with the processes described in Example 1 below.
• the compounds in which X is a group NR 1 or O may be prepared in a standard manner, by activation of 2-oxothiazolidine-4-carboxylic acid in acyl chloride form (for example in dichloromethane or dimethyl- formamide) or in N-succinimidyl form (for example in the presence of EDCl and diisopropylamine in acetonitrile) followed by reaction of the activated species with the amine or the alcohol bearing the desired silyl group. These reactions are preferably performed under an inert atmosphere and in anhydrous medium. This process is illustrated in Examples 2 to 4 below.
• the compound of formula (I) is mainly intended for caring for or treating the skin, in particular the face, the neck, the hands and the neckline. It may also be intended for application to the entire body, in particular when it is incorporated into an antisun product. This compound is thus generally conveyed in a composition suitable for topical application to the skin.
• a subject of the present invention is thus also a composition suitable for topical application to the skin, comprising a compound of formula (I) in a physiologically acceptable medium that is compatible with the skin.
• the amount of compound of formula (I) according to the invention may represent from 0.001% to 10% and preferably from 0.01% to 5% of the total weight of the composition.
• physiologically acceptable medium means a medium that is compatible with the skin and possibly its integuments. It is preferably a cosmetically acceptable medium, i.e. a medium that has a pleasant colour, odour and feel and that does not cause any unacceptable discomfort (stinging, tautness or redness) liable to put the consumer off using this composition.
• This medium generally contains water.
• composition according to the invention may be in any galenical form conventionally used for topical application and especially in the form of lotions, emulsions of liquid or semi-liquid consistency of the milk type, obtained by dispersing a fatty phase in an aqueous phase (O/W) or, conversely, (W/0) , or suspensions or emulsions of soft, semi-solid or solid consistency of the cream or gel type, or alternatively multiple emulsions (W/O/W or 0/W/O) , microemulsions, vesicular dispersions of ionic and/or non-ionic type, or wax/aqueous phase dispersions.
• These compositions are prepared according to the usual methods.
• the composition is in the form of an 0/W emulsion.
• composition may also contain various adjuvants commonly used in cosmetics, such as emulsifiers, including fatty acid esters of polyoxyethylene, optionally polyethoxylated fatty acid esters of sugars, and fatty acid esters of glycerol; fillers; preserving agents; sequestering agents; dyes; fragrances; and thickeners and gelling agents, in particular acrylamide homopolymers and copolymers, acrylamidomethylpropanesulfonic acid (AMPS) homopolymers and copolymers, and acrylic homopolymers and copolymers.
• emulsifiers including fatty acid esters of polyoxyethylene, optionally polyethoxylated fatty acid esters of sugars, and fatty acid esters of glycerol; fillers; preserving agents; sequestering agents; dyes; fragrances; and thickeners and gelling agents, in particular acrylamide homopolymers and copolymers, acrylamidomethylpropanesulfonic acid (AMP
• the compound of formula (I) according to the invention makes it possible to protect the skin and the scalp against oxidative stress, by maintaining the intracellular redox balance.
• a subject of the present invention is thus also the use of a compound of formula (I) as an agent for preventing photoageing of the skin.
• the targeted signs of photoageing of the skin are especially the appearance of wrinkles and fine lines and pigmentation marks, yellowing of the skin (which develops a weathered look) , disorganization of the elastin and collagen fibres, resulting in a loss of elasticity, suppleness and firmness of the skin, and the appearance of telangiectasias.
• a subject of the present invention is thus in particular the use of a compound of formula (I) for preventing or reducing wrinkles and fine lines and slackening of the skin.
• a subject of the present invention is also the use of a compound of formula (I) for preventing UV- induced pigmentation of the skin.
• the compounds according to the invention are useful in particular for preparing the skin to receive sunlight or for protecting the skin during exposure to UV.
• a subject of the invention is also a cosmetic process for preventing photoageing of the skin, comprising the topical application to the skin of a composition comprising a compound of formula (I) in a physiologically acceptable medium.
• composition according to the invention may contain at least one compound chosen from: moisturizers; anti-pollution agents or free-radical scavengers; and soothing agents.
• moistureturizer means: either a compound acting on the barrier function, in order to maintain the moisturization of the stratum corneum, or an occlusive compound. Mention may be made of ceramides, sphingoid-based compounds, lecithins, glycosphingolipids, phospholipids, cholesterol and its derivatives, phytosterols (stigmasterol, ⁇ -sitosterol or campesterol) , essential fatty acids, 1,2-diacyl- glycerol, 4-chromanone, pentacyclic triterpenes such as ursolic acid, petroleum jelly and lanolin; or a compound that directly increases the water content of the stratum corneum, such as threalose and its derivatives, hyaluronic acid and its derivatives, glycerol, pentanediol, sodium pidolate, serine, xylitol, sodium lactate, polyglyceryl acrylate, ectoin and its
• Anti-pollution agents or free-radical scavengers means any compound capable of trapping ozone, monocyclic or polycyclic aromatic compounds such as benzopyrene and/or heavy metals such as cobalt, mercury, cadmium and/or nickel.
• free-radical scavenger means any compound capable of trapping free radicals.
• vitamin C and its derivatives including ascorbyl glucoside; phenols and polyphenols, in particular tannins, ellagic acid and tannic acid; epigallocatechin and natural extracts containing it; extracts of olive tree leaf; extracts of tea, in particular of green tea; anthocyans; extracts of rosemary; phenol acids, in particular chlorogenic acid; stilbenes, in particular resveratrol; sulfur-containing amino acid derivatives, in particular S-carboxymethylcysteine; ergothioneine; N-acetyl- cysteine; chelating agents, for instance N,N'- bis (3, 4, 5-trimethoxybenzyl) ethylenediamine or one of its salts, metal complexes or esters; carotenoids such as crocetin; and various starting materials, for instance the mixture of arginine, histidine ribonucleate, mann
• agents for trapping monocyclic or polycyclic aromatic compounds which may be used in the composition according to the invention, mention may be made in particular of tannins such as ellagic acid; indole derivatives, in particular 3-indolecarbinol; extracts of tea, in particular of green tea, extracts of water hyacinth or Eichhornia crassipes; and the water-soluble fraction of corn sold by the company Solabia under the trade name Phytovityl ® .
• heavy-metal-trapping agents that may be used in the composition according to the invention, mention may be made in particular of chelating agents such as EDTA, the pentasodium salt of ethylenediaminetetramethylenephosphonic acid, and N,N'- bis (3, 4, 5-trimethoxybenzyl) ethylenediamine or one of the salts, metal complexes or esters thereof; phytic acid; chitosan derivatives; extracts of tea, in particular of green tea; tannins such as ellagic acid; sulfur-containing amino acids such as cysteine; extracts of water hyacinth ⁇ Eichhornia crassipes) ; and the water-soluble fraction of corn sold by the company Solabia under the trade name Phytovityl ® .
• chelating agents such as EDTA, the pentasodium salt of ethylenediaminetetramethylenephosphonic acid, and N,N'- bis (3, 4, 5-trimethoxybenzyl) ethylened
• the free-radical scavengers that may be used in the composition according to the invention comprise, besides certain anti-pollution agents mentioned above, vitamin E and its derivatives such as tocopheryl acetate; bioflavonoids; coenzyme QlO or ubiquinone; certain enzymes, for instance catalase, superoxide dismutase, lactoperoxidase, glutathione peroxidase and quinone reductases; glutathione; benzylidenecamphor; benzylcyclanones; substituted naphthalenones; pidolates; phytanetriol; gamma-oryzanol; lignans; and melatonin.
• vitamin E and its derivatives such as tocopheryl acetate; bioflavonoids; coenzyme QlO or ubiquinone
• certain enzymes for instance catalase, superoxide dismutase, lactoperoxidase, glutathi
• ⁇ -glycyrrhetinic acid and salts and/or derivatives thereof glycyrrhetinic acid monoglucuronide, stearyl glycyrrhetinate or 3-stearoyl- oxyglycyrrhetic acid
• ursolic acid and its salts oleanolic acid and its salts
• betulinic acid and its salts extracts of plants such as Paeonia suffruticosa and/or lactiflora, Laminaria saccharina, Boswellia serrata, Centipeda cunnighami, Helianthus annuus, Linum usitatissimum, Cola nitida, Epilobium angustifolium, Aloe
• compositions in accordance with the invention may also comprise at least one UVA-active and/or UVB-active organic photoprotective agent and/or at least one UVA-active and/or UVB-active mineral photoprotective agent, which may be water-soluble or liposoluble or even insoluble in the cosmetic solvents commonly used.
• the organic photoprotective agents are especially chosen from anthranilates; cinnamic derivatives; dibenzoylmethane derivatives; salicylic derivatives; camphor derivatives; triazine derivatives such as those described in patent applications US 4 367 390, EP 863 145, EP 517 104, EP 570 838, EP 796 851, EP 775 698, EP 878 469, EP 933 376, EP 507 691, EP 507 692, EP 790 243 and EP 944 624; benzophenone derivatives; ⁇ , ⁇ ' -diphenylacrylate derivatives; benzotriazole derivatives; benzalmalonate derivatives; benzimidazole derivatives; imidazolines; bis-benzazolyl derivatives as described in patents EP 669 323 and US 2 463 264; p-aminobenzoic acid (PABA) derivatives; methylenebis (hydroxyphenyl)benzotriazole derivatives as described in patent applications US 5 2
• the mineral photoprotective agents are chosen from pigments or even nanopigments (mean size of the primary particles: generally between 5 nm and 100 nm and preferably between 10 nm and 50 nm) of coated or uncoated metal oxides such as, for example, nanopigments of titanium oxide (amorphous or crystallized in rutile and/or anatase form) , of iron oxide, of zinc oxide, of zirconium oxide or of cerium oxide, which are all UV photoprotective agents that are well known per se. Standard coating agents are, moreover, alumina and/or aluminium stearate. Such coated or uncoated metal oxide nanopigments are described in particular in patent applications EP 518 772 and EP 518 773.
• the photoprotective agents are generally present in the compositions according to the invention in proportions ranging from 0.1% to 20% by weight relative to the total weight of the composition and preferably ranging from 0.2% to 15% by weight relative to the total weight of the composition.
• the invention will now be illustrated by means of the non-limiting examples that follow. In these examples, the amounts are indicated as weight percentages.
• the paste obtained is taken up in 150 ml of ethyl acetate and this organic phase is washed with 3 x 100 ml of water and 100 ml of saturated sodium chloride solution, and is then dried over sodium sulfate and filtered.
• reaction mixture is cooled to 0 0 C and oxalyl chloride (0.0163 mol; 1.2 eq) is then added dropwise.
• the reaction medium is stirred at 0 0 C for 30 minutes and then at room temperature for 1 hour 30 minutes.
• Trimethylsilylmethanamine (0.0136 mol; 1 eq) and diisopropylethylamine (0.0408 mol; 3 eq) are added and stirring of the reaction medium is continued at room temperature for 20 hours.
• reaction medium is taken up in 200 ml of ethyl acetate and then washed with 3 x 100 ml of water and 80 ml of saturated aqueous sodium chloride solution.
• Example 4 Preparation of 2- (trimethylsilyl)ethyl (4R)- 2-oxo-l,3-thiazolidine-4-carboxylate 2- (Trimethylsilyl) ethyl (4R) -2-oxo-l, 3- thiazolidine-4-carboxylate is prepared as described in Example 2, except that the trimethylsilylmethanamine is replaced with trimethylsilylethanol. The product is isolated by precipitation from CH2Cl 2 /pentane. The NMR analysis, the mass spectrum and the optical rotation are in accordance with the expected structure.
• the technique for evaluating the photo- protection is performed according to a well-known method (J. of Photochemistry and Photobiology B: Biology 57 (2000) 102-112 TOBI et al : Glutathione modulates the level of free radicals produced in UVA irradiated cells) .
• This technique uses a fluorescent probe as a marker of the global intracellular oxidative stress, 2' , 7' -dichlorofluoresceine diacetate (DCFH-DA) .
• DCFH-DA 2' , 7' -dichlorofluoresceine diacetate
• DCFH-DA as an oxidative stress marker is based on its physicochemical properties. It is a non-ionic apolar molecule capable of diffusing across cell membranes. Once inside the cell, DCFH-DA is hydrolysed by intracellular esterases to a non- fluorescent compound: DCFH or 2, 7-dichlorofluoresceine. In the presence of activated oxygen species, DCFH is rapidly oxidized to a highly fluorescent compound: DCF or 2, 7-dichlorofluoresceine.
• PROCEDURE 1 Treatment of the keratinocytes with a compound of formula (I)
• the keratinocytes are incubated in the presence of the compound of Example 1 for 24 hours at 37 0 C, 5% CO2, in the culture medium, according to a dose effect (3 concentrations) .
• the fluorescence of the DCF is evaluated immediately after the exposure to UVA, by spectro- fluorimetry (excitation: 480 nm; emission: 530 nm) .
• Results The results are expressed in Table 1 below, as a % of fluorescence relative to the control cells exposed to UVA. Table 1
• Example 7 Comparative study of the photoprotective activity of various R-2-oxothiazolidine-4-carboxylic acid derivatives
• Example 6 The test described in Example 6 above was performed under the same conditions on R-2- oxothiazolidine-4-carboxylic acid (Compound A) and on an alkyl derivative thereof, described in patent US- 6 004 543 (Compound B) .

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• 2004
  • 2004-10-21 FR FR0452399A patent/FR2877004B1/fr not_active Expired - Fee Related
• 2005
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  • 2005-09-27 ES ES05802359T patent/ES2308565T3/es active Active
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