tert-Butyl 6-bromo-4-oxospiro[chroman-2,4-piperidine]-1-carboxylate

tert-Butyl 7-benzyl-2,7-diazaspiro[3.5]nonane-2-carboxylate

tert-Butyl 7-amino-1H-spiro[cyclopropane-1,4-isoquinoline]-2(3H)-carboxylate

tert-Butyl 3-(aminomethyl)-2-oxa-8-azaspiro[4.5]decane-8-carboxylate oxalate

tert-Butyl 3-(aminomethyl)-2-oxa-9-azaspiro[5.5]undecane-9-carboxylate hydrochloride

tert-Butyl 1-oxo-7-azaspiro[3.5]nonane-7-carboxylate

tert-Butyl 5-bromo-2-oxospiro[indoline-3,4-piperidine]-1-carboxylate

tert-Butyl 2-oxo-1,2-dihydrospiro[piperidine-4,3-pyrrolo[2,3-b]pyridine]-1-carboxylate

4,7-Diaza-spiro[2.5]octane-4-carboxylic acid tert-butyl ester

tert-Butyl 5-oxo-5,7-dihydrospiro[cyclopenta[b]pyridine-6,4-piperidine]-1-carboxylate

tert-Butyl 5-fluoro-2-oxospiro[indoline-3,4-piperidine]-1-carboxylate

tert-Butyl 1,7-diazaspiro[4.4]nonane-1-carboxylate