Patent ID: 7468460

Claim:
A method for preparing unprotected or carbamate-protected amines of the formulae (II) and (III), R 1 —NH 2 (II) or R 1 —NHCO 2 R 2 (III) comprising reacting hydroxamic acids of the formula (I) (R 1 CONHOH) (I) with a.) alkylphosphonic anhydrides, b.) an alcohol R 2 OH and c.) optionally a base, in a reaction solution at a reaction temperature in the range from −100 to +120° C., wherein the hydroxamic acid (1) is generated either before the reaction or during the reaction (in situ), and R 1 is an optionally substituted linear or branched C 1 -C 12 -alkyl radical, substituted C 3 -C 10 -cycloalkyl, alkenyl, aryl or heteroaryl radicals, and R 2 is an allyl, aryl, open-chain, cyclic or branched C 1 to C 12 -alkyl radical, an aryloxy, allyloxy or alkoxy radical optionally substituted by open-chain, cyclic or branched C 1 to C 12 -alkyl radicals.