(R)-tert-Butyl 1-cyclohexylpyrrolidin-3-ylcarbamate

(R)-tert-Butyl 1-propionylpyrrolidin-3-ylcarbamate

(R)-tert-Butyl 1-(4-fluorobenzoyl)pyrrolidin-3-ylcarbamate

tert-Butyl 1-picolinoylpiperidin-4-ylcarbamate

tert-Butyl 1-(cyclopentylcarbamoyl)piperidin-4-ylcarbamate

tert-Butyl 1-(2,4-difluorobenzyl)piperidin-4-ylcarbamate

tert-Butyl 1-(4-fluoro-2-methylbenzyl)piperidin-4-ylcarbamate

tert-Butyl 1-(3-chloro-2-fluorobenzyl)piperidin-4-ylcarbamate

tert-Butyl 1-(5-fluoro-2-methylbenzyl)piperidin-4-ylcarbamate

tert-Butyl 1-isobutyrylpiperidin-4-ylcarbamate

Methyl 4-[4-(tert-butoxycarbonylamino)piperidine-1-carbonyl]benzoate