(R)-tert-Butyl 1-(2-nitrophenyl)pyrrolidine-3-ylcarbamate

tert-Butyl 4-(2-nitrophenylamino)piperidine-1-carboxylate

4-(3-Fluoro-2-nitrophenyl)morpholine

tert-Butyl 4-(3-nitropyridine-2-ylamino)piperidine-1-carboxylate

4-(2-Fluoro-6-nitrophenyl)morpholine

2-Fluoro-N-(2-methoxyethyl)-6-nitroaniline

tert-Butyl 4-(4-methoxybenzylamino)piperidine-1-carboxylate

tert-Butyl 4-(4-chlorobenzylamino)piperidine-1-carboxylate

N-(piperidine-4-yl)isobutylamide hydrochloride

tert-Butyl 4-(neopentylamino)piperidine-1-carboxylate