Patent Application
20050124579
The present invention relates to the use or benzyl alcohol derivatives for the antimicrobial treatment of surfaces, as antimicrobial active substance against Gram-positive and Gram-negative bacteria, and preservation of cosmetics, household products, textiles, plastics and disinfectants, and also to novel benzyl alcohol derivatives.
The benzyl alcohol derivatives used according to the invention have the formula
in which
The C2-C20alkyls interrupted by one or more heteroatoms are interrupted, in particular, by O, S or N.
In preferred compounds used according to the invention,
Interesting compounds which can be used according to the invention have the formula
in which
Further interesting compounds which can be used according to the invention have the formulae
in which
Particularly preferred compounds of the formulae (1b)-(1f) are those in which
Table 1 below lists examples of further compounds which can be used according to the invention:
Preferred are the compounds of formulae (14), (28), (37), (38), (39) and (40).
Benzyl alcohol derivatives used according to the invention are prepared by known methods, which comprises reacting a compound of the formula (2a)
with a halide Hal-R1 or a mixture of Hal-R1/Hal-R2, Hal-R1/Hal-R3, Hal-R2/Hal-R3 or Hal-R1/Hal-R2/Hal-R3, in which all substituents can have the meanings given in formula (1) and R′ is hydrogen or O—C1-C5alkyl, to give a compound of the formula (2b)
The compound of the formula (2b) is then converted, by reduction, into the compound of the formula (1).
The overall reaction can be represented by the following scheme:
The synthesis of the compounds of the formula (2b) is, in particular, carried out in a solvent, such as dimethylformamide, methanol, ethanol, acetone, acetonitrile or ethyl acetate, to which an (auxiliary) base, such as, for example, sodium hydride, sodium alkoxides or alkali metal carbonate, has been added, at a temperature of from 40 to 120° C., preferably 60 to 100° C.
Per OH group of the compound of the formula (2a), preferably 1.1 equivalent of the halide Hal-R1 or a mixture of Hal-R1/Hal-R2, Hal-R1/Hal-R3, Hal-R2/Hal-R3 or Hal-R1/Hal-R2/Hal-R3 is added. Preferred halides are chlorides and bromides.
The reaction time is 2 to 48 hours. A preferred reaction time is about 18 hours.
The reduction of the compounds of the formula (2b) to give compounds of the formula (1) is carried out in accordance with customary methods.
The reducing agents used are customary reducing agents, such as, for example, hydrogen, metal hydrides or dithionite.
The solvents used are, for example, diethyl ether or tetrahydrofuran.
The reducing agent is customarily added in a 10- to 20-fold excess.
The reaction temperature is usually between 20 and 50° C., preferably 25 to 45° C.
Further details relating to the preparation process are given in the corresponding examples.
The benzyl alcohols used according to the invention exhibit a marked antimicrobial effect, in particular against pathogenic Gram-positive and Gram-negative bacteria and also against skin flora bacteria. They are therefore suitable, in particular, for the disinfection, deodorization, and also the general and antimicrobial treatment of the skin and mucosae, and skin appendages (hair), very particularly for hand and wound disinfection. They are therefore suitable as antimicrobial active substances and preservatives in bodycare compositions, such as, for example, shampoos, bath products, haircare compositions, liquid and solid soaps (based on synthetic surfactants and salts of saturated and/or unsaturated fatty acids), lotions and creams, deodorants, other aqueous or alcoholic solutions, e.g. cleansing solutions for the skin, moist cleansing wipes, oils or powders.
The invention therefore further provides a bodycare composition comprising at least one compound of the formula (1) and cosmetically acceptable carriers or auxiliaries.
The bodycare composition according to the invention comprises 0.01 to 15% by weight, preferably 0.1 to 10% by weight, based on the total weight of the composition, of the benzyl alcohol compound of the formula (I) and cosmetically acceptable auxiliaries.
Depending on the form in which the bodycare composition is present, as well as the benzyl alcohol compound of the formula (1), it also has further constituents, such as, for example, sequestering agents, dyes, perfume oils, thickening or setting agents (consistency regulators), emollients, UV-absorbers, skin protectants, antioxidants, additives which improve the mechanical properties, such as dicarboxylic acids and/or Al, Zn, Ca, Mg salts of C14-C22 fatty acids and optionally preservatives.
The bodycare composition according to the invention can be formulated as a water-in-oil emulsion or oil-in-water emulsion, as an alcoholic or alcohol-containing formulation, as a vesicular dispersion of an ionic or nonionic amphiphilic lipid, as a gel, solid stick or as an aerosol formulation.
As a water-in-oil or oil-in-water emulsion, the cosmetically acceptable auxiliary preferably comprises 5 to 50% of an oil phase, 5 to 20% of an emulsifier and 30 to 90% of water. The oil phase can comprise any oil suitable for cosmetic formulations, such as, for example, one or more hydrocarbon oils, a wax, a natural oil, a silicone oil, a fatty acid ester or a fatty alcohol. Preferred mono- or polyols are ethanol, isopropanol, propylene glycol, hexylene glycol, glycerol and sorbitol.
Cosmetic formulations according to the invention are used in various fields. In particular, the following compositions, for example, are considered:
An antimicrobial soap has, for example, the following composition:
A shampoo has, for example, the following composition:
A deodorant has, for example, the following composition:
The invention further provides an oral composition comprising 0.01 to 15% by weight, based on the total weight of the composition, of the compound of the formula (1) and orally acceptable auxiliaries.
Example of an oral composition:
The oral composition according to the invention can be, for example, in the form of a gel, a paste, a cream or an aqueous preparation (mouthwash).
In addition, the oral composition according to the invention can comprise compounds which release fluoride ions, which are effective against the formation of caries, e.g. inorganic fluoride salts, such as, for example, sodium fluoride, potassium fluoride, ammonium fluoride or calcium fluoride, or organic fluoride salts, such as, for example, amine fluorides, which are known under the trade name Olafluor.
In addition, the benzyl alcohol derivatives of the formula (1) used according to the invention are suitable for the treatment, in particular preservation, of textile fibre materials. The fibre materials are undyed and dyed or printed and are made of, for example, silk, wool, polyamide or polyurethanes, and in particular cellulosic fibre materials of all types. Such fibre materials are, for example, natural cellulose fibres, such as cotton, linen, jute and hemp, and also regenerated cellulose. Preferred suitable textile fibre materials are made of cotton.
The benzyl alcohols according to the invention are also suitable for the treatment, in particular for the antimicrobial finishing or preservation, of plastics, such as, for example, polyethylene, polypropylene, polyurethane, polyester, polyamide, polycarbonate, latex etc. Fields of use for these are, for example, floor coverings, plastic coatings, plastic container and packaging materials; kitchen and bathroom utensils (e.g. brushes, shower curtains; sponges, bathroom mats), latex, filter materials (air and water filters), plastic articles used in the medical sector, such as, for example, bandaging materials, syringes, catheters etc., so-called medical devices, gloves and mattresses.
Paper too, such as, for example, hygiene papers, can be antimicrobially finished with the benzyl alcohols according to the invention.
In addition, nonwovens, such as, for example, nappies, sanitary towels, panty liners, wipes for the hygiene and household sector, can be antimicrobially finished according to the invention.
In addition, the benzyl alcohols of the formula (1) are used in washing and cleaning formulations, such as, for example, in liquid and powder detergents or fabric softeners.
The benzyl alcohols can be used, in particular, also in household and all-purpose cleaners for the cleaning and disinfection of hard surfaces. A cleaner has, for example, the following composition:
As well as the preservation of cosmetics and household products, the preservation and antimicrobial finishing of technical products and also use as biocide in technical processes is also possible, such as, for example, in the treatment of paper, in particular in paper-treatment liquors, printing thickeners made of starch or cellulose modifications, surface coatings and paints.
The benzyl alcohols of the formula (1) are also suitable for the antimicrobial treatment of wood and also for the antimicrobial treatment, preservation and finishing of leather.
In addition, the compounds according to the invention are suitable for protecting cosmetic products and household products against microbial decay.
The benzyl alcohols which can be used according to the invention are known compounds or novel compounds.
The novel compounds have the above formula
in which
The examples below, which do not limit the invention, are used for illustration.
In a reaction vessel with attached condenser and stirrer, 10 g (82 mmol) of 4-hydroxybenzyldehyde and 11.3 g (82 mmol) of dried potassium carbonate are initially introduced into 60 ml of dry dimethylformamide, and 17.4 g (90 mmol) of n-octyl bromide are added. The mixture is stirred for 18 hours at 80° C. After the solvent has been stripped off at 10−2 mbar, the residue is taken up in 100 ml of water and 50 ml of petroleum ether, the organic phase is separated off, dried and then the solvent is stripped off. The intermediate can be used subsequently without further purification steps.
For the reduction, 2.5 g (67 mmol) of lithium aluminium hydride are initially introduced into 200 ml of diethyl ether, and, at room temperature, the solution of 15.7 g (67 mmol) of the precursor in 50 ml of diethyl ether is added dropwise thereto. The reaction mass is refluxed for 6 hours and, after cooling, carefully transferred dropwise to 200 ml of water. Following acidification of the aqueous phase with concentrated hydrochloric acid to pH 2, the organic phase is separated off, washed with water until neutral and evaporated. The crystalline residue is recrystallized from a small amount of n-hexane.
The resulting colourless crystals which correspond to the compound of the formula
(=compound (9) in Table 1), are obtained in a yield of 62%.
The purity is 97 area % LC(254 nm).
The recorded 1H/13C-NMR spectra confirm the structure.
The other compounds in Table 1 can be prepared analogously to Synthesis Example 1 using the respective starting materials.
Determination of the Minimum Inhibition Concentration (MIC Value) in Microtitre Plates
Nutrient Medium:
Casein-soy flour-peptone broth for the preparation of the precultures of the test bacteria and yeast.
Examples of Test Microbes:
Bacteria: Staphylococcus aureus ATCC 6538
The test substances are predissolved in dimethyl sulphoxide (DMSO) and tested in a dilution series of 1:2.
The bacteria are cultivated overnight in CASO broth and sponged off with 10 ml of 0.85% sodium chloride solution (+0.1% TritonX-100).
All of the test microbes are adjusted to a microbial count of 1-5×106 CFU/ml with 0.85% sodium chloride solution.
The test substances are prepipetted at 8 μl per well into microtitre plates.
Prediluted microbial suspensions are diluted 1:100 in CASO broth and added at 192 μl per well to the test substances.
The test mixtures are incubated at 37° C. for 48 hours.
After incubation, the growth is determined by reference to the clouding of the test mixtures (optical density) at 620 nm in a microplate reader.
The minimum inhibition concentration (MIC value) is the concentration of substance at which (compared with the growth control) a significant growth inhibition (<20% growth) of the test microbes is established.
One microtitre plate is prepared per test microbe and substance concentration. All of the substances are tested in duplicate.
Table 2 lists the results. The compounds correspond to those in Table 1:
| Number | Date | Country | Kind |
|---|---|---|---|
| 02405210.2 | Mar 2002 | EP | regional |
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/EP03/02618 | 3/13/2003 | WO |
