Bleaching and dyeing; fluid treatment and chemical modification – Dyeing involving animal-derived natural fiber material ,... – Hair dyeing
Reexamination Certificate
2000-09-12
2003-11-18
Gupta, Yogendra N. (Department: 1751)
Bleaching and dyeing; fluid treatment and chemical modification
Dyeing involving animal-derived natural fiber material ,...
Hair dyeing
C008S405000, C008S406000, C008S410000, C008S421000, C008S426000, C008S437000
Reexamination Certificate
active
06648923
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The subject matter of the present invention is a method for making 1,4-diamino-2-methoxymethylbenzene and physiologically compatible salts thereof. It also includes compositions and methods for dyeing keratin fibers containing the 1,4-diamino-2-methoxymethylbenzene and physiologically compatible salts thereof.
2. Prior Art
A method of making substituted 1,4-diaminobenzene compounds with a substituent on the 2 position is known from U.S. Pat. No. 2,273,564, in which the corresponding nitroaniline is catalytically hydrogenated. The preparation of the 1,4-diamino-2-methoxymethyl benzene according to this process however is very expensive, since an expensive purification of the final product is required, which is also made more difficult by the oxidation sensitivity of the obtained free base.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a simple manufacturing method for making 1,4-diamino-2-methoxymethyl benzene which permits a simple production of the oxidation-insensitive salts.
It has now surprisingly been found that the 1,4-diamino-2-methoxymethyl benzene and its salts of formula (I) are obtainable from a nitrophenol of formula (IV) by reaction to the appropriate phenoxyacetamide of formula (V) and subsequently rearranging to form the nitroaniline of formula (VI) and reducing in a simple manner with good yield.
The subject matter of the present invention is thus a method for making 1,4-diamino-2-methoxymethylbenzene and its physiologically compatible salts of formula (I):
wherein n is a number from 0 to 2 and HX represents an inorganic or organic salt, which comprises
a) reacting 2-methoxymethyl-4-nitrophenol of formula (IV) with chloroacetamide to form 2-(2-methoxymethyl-4-nitrophenoxy)acetamide of formula (V);
b) rearranging the 2-(2-methoxymethyl-4-nitrophenoxy)acetamide of formula (V) to form 2-methoxymethyl-4-nitroaniline of formula (VI); and then
c) hydrogenating the 2-methoxymethyl-4-nitroaniline of formula (VI) catalytically to form 1,4-diamino-2-methoxmethyl benzene of formula (I) and converting with an acid to a suitable acid adduct if necessary (when n≠0).
Either inorganic or organic acids can be used as the acid ingredient. However the following acids are preferred: hydrochloric acid, sulfuric acid, boric acid, citric acid and tartaric acid. Hydrochloric and sulfuric acid are especially preferred.
The 2-methoxymethyl-4-nitrophenol of formula (IV) is reacted with a halogen acetamide with heating. Iodoacetamide is especially suitable for this purpose however the somewhat less reactive bromoacetamide is also suitable. If the less expensive chloroacetamide is to be used instead, it is advantageous to catalyze the reaction with an iodide, such as sodium iodide or potassium iodide. The amount of the iodide that will result in a higher reaction rate is considerably more than 10% (molar); 50% (molar) has proven to be suitable throughout. The reaction can be performed easily in the usual manner in a single dipolar aprotic solvent under reflux temperature. The dipolar aproteic solvent can be, for example, acetone, a di(C
1
- to C
6
-)alkyl ether of a mono or polyethylene glycol(e.g. an ethylene glycol dialkyl ether, a diethylene glycol dialkyl ether, a triethylene glycol dialkyl ether or a polyethylene glycol dialkyl ether). Acetone or a di(C
1
- to C
6
-)alkyl ether of a mono or polyethylene glycol with a boiling point under 200° C., particularly ethylene glycol dimethyl ether, is preferred. The reaction of the resulting 2-(2-methoxymethyl-4-niotrophenoxy)-acetamide of formula (V) to the corresponding nitroaniline (VI) occurs by heating of the compound of formula (V) in a solvent, such as dimethylformamide, dimethylacetamide or N-methylpyrrolidone, while adding a base, analogous to the reaction described in W. R. Baker, J.Org. Chem. 48, 5140 (1983). Besides the bases disclosed in this reference carbonates, such as sodium carbonate or potassium carbonate, can be used as the added base. Since the carbonates are present in a suspension under the conditions of this latter reaction, it is advantageous to provide it as a fine powder and to use it in a two to five fold excess. The powder should be as fine as possible. The reaction can be performed in a wide temperature range. At temperatures below 80° C. the conversion is low, while at temperatures above 140° C. the reaction mixture is darkly colored by by-products, so that the preferred temperature is in a range from 80 to 120° C. The subsequent catalytic hydrogenation to 1,4-diamino-2-methoxymethylbenzene of formula (I) occurs in the usual manner at room temperature with slightly elevated hydrogen pressure or at slightly elevated temperatures over a palladium/activated charcoal catalyst. It is particularly advantageous that in the method according to the invention scarcely any interfering by-products are produced so that additional purification is not necessary. The product of formula (I) is isolated, preferably in the form of a salt with an organic or inorganic acid, especially hydrochloride or sulfuric acid, (n≠0) because of the high oxidation sensitivity of the free base. The acid is added in a slight excess considering the number of respective acid groups, so that both amine groups in the compound of formula (I) are protonated. Monobasic acids should be added in amounts of from 2 to 2.5 equivalents, while dibasic acids should be added in amounts of from 1 to 1.5. Alcohols and ether are preferred as solvents for salt formation, since generally the acids are soluble in them and adducts that are formed in them will easily crystallize out from them.
The compounds of formula (I) are outstanding as oxidation dye-precursor compounds for dyeing keratin fibers. The present invention also includes compositions and methods for dyeing keratin fibers, especially wool, silk or hair, particularly human hair, using the compounds of formula (I). Although the compounds of formula (I) are especially suitable for dyeing kertain fibers, in principle it would also be possible to dye other natural or synthetic fibers, especially cotton or nylon 66, with these compounds.
The compounds of formula (I) can be used both alone and also in combination with certain known developer substances and/or coupler substances. The following compounds especially are suitable coupler substances: N-(3-dimethylaminophenyl)urea, 2,6-diaminopyridine, 2-amino-4-[(2-hydroxyethyl)amino]anisole, 2,4-diamino-1-fluoro-5-methylbenzene, 2,4-diamino-1-methoxy-5-methylbenzene, 2,4-diamino-1-ethoxy-5-methylbenzene, 2,4-diamino-1-(2-hydroxyethoxy)-5-methylbenzene, 2,4-di-[(2-hydroxyethyl)amino]-1,5-dimethoxybenzene, 2,3-diamino-6-methoxypyridine, 3-amino-6-methoxy-2-(methylamino)-pyridine, 2,6-diamino-3,5-dimethoxypyridine, 3,5-diamino-2,6-dimethoxypyridine, 1,3-diaminobenzene, 2,4-diamino-1-(2-hydroxyethoxy)benzene, 2,4-diamino-1-(3-hydroxypropoxy)benzene, 1-(2-aminoethoxy)-2,4-diaminobenzene, 2-amiono-1-(2-hydroxyethoxy)-4-methylaminobenzene, 2,4-diaminophenoxyacetic acid, 3-[di(2-hydroxyethyl)-amino]aniline, 4-amino-2-di[(2-hydroxyethyl)amino]-1-ethoxybenzene, 5-methyl-2-(1-methylethyl)phenol, 3-[(2-hydroxyethyl)amino]aniline, 3-[(2-aminoethyl)amino]aniline, 1,3-di(2,4-diaminophenoxy)propane, di-(2,4-diaminophenoxy)methane, 1,3-diamino-2,4-dimethoxybenzene, 2,6-bis-(2-hydroxyethyl)aminotoluene, 4-hydroxyindol, 3-dimethylaminophenol, 3-diethylaminophenol, 5-amino-2-methylphenol, 5-amino-4-fluoro-2-methylphenol, 5-amino-4-methoxy-2-methylphenol, 5-amino-4-ethoxy-2-methylphenol, 3-amino-2,4-dichlorophenol, 5-amino-2,4-dichlorophenol, 3-amino-2-methylphenol, 3-amino-2-chloro-6-methyl-phenol, 3-amino-phenol, 2-[(3-hydroxyphenyl)amino]acetamide, 5-[(2-hydroxy-ethyl)amino]-2-methylphenol, 3-[(2-hydroxyethyl)amino]-phenol, 3-[(2-methoxy-ethyl)amino]-phenol, 5-amino-2-ethylphenol, 2-(4-amino-2-hydroxyphenoxy)-ethanol, 5-[(3-hydroxypropyl)amino]-2-methylphenol, 3-[(2,3-dihydroxyprop
Braun Hans-Juergen
Goettel Otto
Hayoz André
Pirrello Aline
Elhilo Eisa
Gupta Yogendra N.
Wella Aktiengesellschaft
LandOfFree
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