Patent ID: 8865906

Claim:
A process for obtaining the compound of the formula I and/or all stereoisomeric forms of the compound of the formula I and/or mixtures of these forms in any ratio, where A2 is aminopyridyl, Y is —(C 3 -C 8 )-cycloalkyl, and Z is 1) —(C 1 -C 6 )-alkyl, 2) —(C 1 -C 6 )-alkyl-OH, 3) —(C 1 -C 4 )-alkylene-(C 3 -C 6 )-cycloalkyl, 4) —CH 2 -phenyl, wherein phenyl is unsubstituted or substituted once or twice by NO 2 or methoxy, 5) —CH 2 —CH═CH 2 or 6) —(C 1 -C 10 )-alkylene-O—C(O)—O—(C 3 -C 6 )-cycloalkyl, which comprises A) reacting a compound of the formula IV with an oxalic acid diester of formula V in the presence of a base and a solvent wherein R14 is —(C 1 -C 6 )-alkyl, to give a compound of formula VI B) reacting the compound of formula VI with the compound of formula VII in the presence of a base and a solvent, optionally in the presence of a quarternary ammonium halide catalyst: W—CH 2 -A2-R15 (VII) wherein W is a halogen or a sulfonyl ester, and R15 is an amino-protecting group, to give a compound of formula VIII C) and deprotecting the compound of formula VIII in the presence of a deprotecting agent and a solvent to give a compound of formula I, or D) optionally a compound of the formula I which has been prepared by process steps A), B) and C) and occurs owing to its chemical structure in enantiomeric forms being fractionated by salt formation with enantiopure acids or bases, chromatography on chiral stationary phases or derivatization using chiral enantiopure compounds, separation of the diastereomers obtained in this way, and elimination of the chiral auxiliary groups into the pure enantiomers.