Patent ID: 7060851

Claim:
A diastereomer purification method comprising (a) preparing an organic acid salt or inorganic acid salt of an amino compound of formula wherein R 3 represents hydrogen, alkyl, alkenyl, alkynyl, hydroxyalkyl, alkoxyalkyl, cycloalkyl, cycloalkylalkyl, heterocycloalkyl, heteroaryl, heterocycloalkylalkyl, aryl, aralkyl, heteroaralkyl, aminoalkyl or N-mono- or N,N-disubstituted aminoalkyl radicals, wherein said substituents are alkyl, aryl, aralkyl, cycloalkyl, cycloalkylalkyl, heteroaryl, heteroaralkyl, heterocycloalkyl, or heterocycloalkylalkyl radicals, or in the case of a disubstituted aminoalkyl radical, said substituents along with the nitrogen atom to which they are attached form heterocycloalkyl or heteroaryl radicals; and P 1 and P 2 are each independently hydrogen, acyl, aralkyl, silyl, aralkoxycarbonyl, alkoxycarbonyl, alkylcarbonyl, aralkylcarbonyl, arylcarbonyl or cycloalkenylalkyl radicals; or P 1 and P 2 together with the nitrogen atom to which they are bonded form a heterocyclic ring system; and (b) precipitating or crystallizing said organic acid salt or said inorganic acid salt from a solution.