Patent ID: 8026372

Claim:
Process for the preparation of an ω-alkoxycarbonylamino-α-aminoacid of formula 1 wherein n is a number from 2 to 6, R 1 is C 1 -C 12 alkyl, C 1 -C 12 cycloalkyl or C 1 -C 6 alkenyl, all optionally substituted with aryl, heteroaryl, halogen, C 1 -C 4 alkylthio, C 1 -C 4 alkylsulphonyl, arylsulphonyl, or trimethylsilyl, wherein aryl and heteroaryl may be substituted or unsubstituted, R 2 is hydrogen or methyl, optionally substituted with halogen atoms, comprising reacting in a solvent an α,ω-diaminoacid of formula 2 wherein n and R 2 have the same meaning as above, with a 1-alkoxycarbonylbenzotriazole of formula 3 wherein R 1 has the same meaning as above and R 3 means from 0 to 2 substituents chosen from the group consisting of methyl, trifluoromethyl, chlorine, bromine and nitro.