2-mercapto-imidazole derivatives substituted in position 4 (or 5) as antioxidizing agents, method of preparation and applications in the pharmaceutical, cosmetic or food industries
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United States of America Patent
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-
May 2, 2000
Issued Date -
N/A
app pub date -
Sep 15, 1997
filing date -
Dec 24, 1993
priority date (Note) -
Expired
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Abstract
The invention relates to 2-mercaptoimidazole derivatives substituted in the 4(or 5)-position. These 2-mercaptoimidazole derivatives are of the general formula (I) below: ##STR1## wherein: R.sub.1, R.sub.2, R.sub.5, R.sub.7 and R.sub.8 are hydrogen, a lower alkyl, an aralkyl or a substituted aralkyl, wherein at least one of R.sub.1 and R.sub.2 is hydrogen; R.sub.3 is (CH.sub.2).sub.n COR.sub.4, --(CH.sub.2).sub.n N.sup.+ (R.sub.5 R.sub.6 R.sub.7).X.sup.- or --CH.sub.2 CH(COR.sub.4)N.sup.+ (R.sub.5 R.sub.6 R.sub.7).X.sup.- ; R.sub.4 is OR.sub.8, --NHR.sub.5, --.alpha.-amino acid, --NHCH.sub.2 CH.sub.2 SO.sub.3.sup.-.Y.sup.+, --NHCH.sub.2 CH.sub.2 CO.sub.2.sup.- Y.sup.+, --OCH.sub.2 CH.sub.2 N.sup.+ (CH.sub.3).sub.3.X.sup.- ; ##STR2## n=1 or 2; X.sup.31 is an anion of an acid acceptable in cosmetics, pharmaceuticals or foodstuffs; and Y.sup.+ is a cation of a base acceptable in cosmetics, pharmaceuticals or foodstuffs. These compounds are valuable as antioxidants and as active principles of pharmaceutical, cosmetic or food compositions with antioxidant activity.
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