Classifications

• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61Q—SPECIFIC USE OF COSMETICS OR SIMILAR TOILETRY PREPARATIONS
  • A61Q17/00—Barrier preparations; Preparations brought into direct contact with the skin for affording protection against external influences, e.g. sunlight, X-rays or other harmful rays, corrosive materials, bacteria or insect stings
  • A61Q17/04—Topical preparations for affording protection against sunlight or other radiation; Topical sun tanning preparations
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K8/00—Cosmetics or similar toiletry preparations
  • A61K8/18—Cosmetics or similar toiletry preparations characterised by the composition
  • A61K8/30—Cosmetics or similar toiletry preparations characterised by the composition containing organic compounds
  • A61K8/46—Cosmetics or similar toiletry preparations characterised by the composition containing organic compounds containing sulfur
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
  • C07C323/00—Thiols, sulfides, hydropolysulfides or polysulfides substituted by halogen, oxygen or nitrogen atoms, or by sulfur atoms not being part of thio groups

Definitions

• the present invention relates to sulfur derivatives of paraethoxycinnamic acid which do not penetrate into the circulatory torrent. It also relates to obtaining said sulfur derivatives.
• the invention also relates to cosmetic use, and the protection of human skin against solar radiation; it also relates to the dermo-pharmaceutical and cosmetic compositions containing them.
• R represents non-sulfur alkyl groups.
• 2-ethylhexyl para-methoxycinnamate is the molecule which currently has one of the filtering powers the most selective; it is very widely used in sunscreen preparations in France and worldwide. It is recognized by the FDA as meeting the necessary criteria for a selective sunscreen. However, D. CLAUS (University doctorate thesis mention Pharmacy, 1982, France) was able to show that this sunscreen penetrates into the blood after application to rabbit skin.
• the present invention relates to sulfur derivatives of para-methoxycinnamic acid.
• the compounds of the invention correspond to general formula III below:
• the cinnamic double bond can exist either in the cis form, or in the trans form
• - n is an integer between 1 and 6
• - m is an integer between 1 and 6, and is preferably equal to 1 or 2
• R- R-] is a radical -OR, R being a hydrogen atom or an alkyl or aryl group, R-] can also be an amino-alkyl or amino-aryl, or have an amino acid structure giving a pep bond - tidic
• R2 represents a hydrogen atom or an alkyl or aryl group or a group of formula R'-CO-, R 'being an alkyl or aryl group or also R'-CO- having an amino acid structure giving a peptide bond.
• alkyl denotes aliphatic hydrocarbon groups containing 1 to 12 carbon atoms, with a straight or branched chain. Preferred are lower alkyl groups, i.e., alkyl groups containing 1 to 4 carbon atoms.
• aryl denotes non-heterocyclic aromatic groups of the phenyl, benzyl type and higher homologues, substituted or not, as well as heterocyclic aromatic groups having 4 to 7 carbon atoms in the aromatic ring and 1 to 4 heteroatoms which can be oxygen, nitrogen, sulfur, of the furan, pyridine, oxazole type, as well as their saturated derivatives, cyclohexane and tetrahydrofuran, piperidine, oxazolidine respectively.
• the present invention also relates to a process for the synthesis of sulfur derivatives of para-methoxycinnamic acid with a disulphide bridge and with an inoic group, of formula III above, which is characterized in that it consists in making reacting a compound taken from the group which comprises sulfur amino acids and peptides having a free SH group, as well as their derivatives, with thio-2-ethanol para-methoxycinnamate of formula II below:
• the subject of the present invention is also the para-methoxycinnamate of thio-2-ethanol of formula II, in quality of intermediary for the preparation of the compounds of formula III.
• the sulfur amino acid used is cysteine or one of its higher homologs such as homocysteine, or a derivative of these amino acids.
• the reaction of the amino acid or the sulfur-containing protide with the para-methoxycinnamate of thio-2-ethanol of formu ⁇ II is carried out in the presence of iodine in an appropriate aqueous medium.
• the reduction of bis- (para - methoxycinnamate) from. dithio-2,2'-diethanol of formula IV into thio-2-ethanol para-methoxycinnamate of formula II is carried out using sodium borohydride, in an appropriate aqueous medium.
• the compounds of formula III in accordance with the present invention have properties of interesting sun filters. They exhibit maximum effectiveness both in terms of their ultraviolet absorption capacity and in terms of their attachment to the skin. Their absorption spectrum is in the U.V.B. area. erythematogens with a maximum around 310 nm; they let U.V.A.
• Dermo-pharmaceutical composition containing a compound having properties of sunscreen in accordance with the present invention
• the compound having solar filter properties, in accordance with the present invention is incorporated at a concentration of 5% in an emulsion which may for example have the following composition:
• PEG mono - and distearate (Tefose 1500) 7 g Stearic acid 1 g
• the sunscreen Since the sunscreen has an ester function which is hydrolyzed by blood esterases, the plasma fractions have been tested for the presence of the metabolite that is para-methoxycinnamic acid.
• Cinnamic acid which is added to the plasma, was used as the internal standard.
• the latter is acidified and then extracted with an acetone-methylene chloride mixture (1: 3), the extracts are then injected after derivatization with BSTFA.
• the sulfur filter no longer passes into the blood whereas the PMCEH applied under the same conditions is found therein in the form of para-methoxycinnamic acid at a concentration between ng and several ⁇ g.

Landscapes

• Health & Medical Sciences (AREA)
• Organic Chemistry (AREA)
• Life Sciences & Earth Sciences (AREA)
• Chemical & Material Sciences (AREA)
• Animal Behavior & Ethology (AREA)
• General Health & Medical Sciences (AREA)
• Public Health (AREA)
• Veterinary Medicine (AREA)
• Epidemiology (AREA)
• Birds (AREA)
• Dermatology (AREA)
• Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
• Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
• Cosmetics (AREA)
• Catalysts (AREA)
• Low-Molecular Organic Synthesis Reactions Using Catalysts (AREA)
• Peptides Or Proteins (AREA)
• Acyclic And Carbocyclic Compounds In Medicinal Compositions (AREA)

Priority Applications (3)

Applications Claiming Priority (2)

Publications (1)

Family

ID=9305416

Family Applications (1)

Country Status (5)

Cited By (3)

Families Citing this family (1)

Citations (1)

• 1984
  • 1984-06-22 FR FR8410009A patent/FR2566400B1/fr not_active Expired
• 1985
  • 1985-06-21 JP JP60502740A patent/JPH0629237B2/ja not_active Expired - Lifetime
  • 1985-06-21 EP EP19850903007 patent/EP0185066B1/fr not_active Expired
  • 1985-06-21 DE DE8585903007T patent/DE3562240D1/de not_active Expired
  • 1985-06-21 WO PCT/FR1985/000164 patent/WO1986000304A1/fr not_active Ceased

Patent Citations (1)

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