(1R,4R)-{4-[(2-Chloro-acetyl)-methyl-amino]-cyclohexyl}-carbamic acid tert-butyl ester

(S)-3-[(2-Chloro-acetyl)-ethyl-amino]-pyrrolidine-1-carboxylic acid tert-butyl ester

3-{[(2-Chloro-acetyl)-ethyl-amino]-methyl}-piperidine-1-carboxylic acid tert-butyl ester

3-{[(2-Chloro-acetyl)-isopropyl-amino]-methyl}-pyrrolidine-1-carboxylic acid tert-butyl ester

{2-[(2-Chloro-acetyl)-isopropyl-amino]-cyclohexyl}-carbamic acid tert-butyl ester

3-[(2-Chloro-acetyl)-cyclopropyl-amino]-pyrrolidine-1-carboxylic acid tert-butyl ester

4-[(2-Chloro-acetyl)-cyclopropyl-amino]-piperidine-1-carboxylic acid tert-butyl ester

{4-[(2-Chloro-acetyl)-cyclopropyl-amino]-cyclohexyl}-carbamic acid tert-butyl ester

3-(2-Chloro-acetylamino)-piperidine-1-carboxylic acid benzyl ester

(R)-3-[(2-Chloro-acetyl)-methyl-amino]-pyrrolidine-1-carboxylic acid benzyl ester