Method for producing amines from hydroxamic acids
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United States of America Patent
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Dec 23, 2008
Grant Date -
Sep 11, 2008
app pub date -
Jul 5, 2006
filing date -
Jul 11, 2005
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Abstract
A method for producing unprotected or carbamate-protected amines of formulae (II) and (III) or R.sup.1--NH.sub.2 (II) or R.sup.1--NHCO.sub.2R.sup.2 (III) by reacting hydroxamic acids of formula (I) (R.sup.1 CONHOH) with a) alkylpliosphonic acid anhydrite's, b) alcohol R.sup.2OH and c) optionally with a base, at a temperature ranging from 100 to +120.degree.C., wherein the hydroxainic acid (I) is produced prior to or during reacting (in situ) and R.sup.1 is an optionally substituted linear or branched C.sub.1-C.sub.12 alkyl radical, substituted C.sub.3-C.sub.10 cycloalkyl, alkenyl, aryl or heteroaryl radical and R.sup.2 is an open-chain, cyclic or branched allyl, aryl or C.sub.1 to C.sub.12-alkyl radicals, or aryloxy, allyloxy or alkoxy radical possibly substituted with open-chain, cyclic or branched C.sub.1 to C.sub.12-alkyl radicals.
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