- tert-butyl 6-oxo-2-azaspiro[3.4]octane-2-carboxylate
- tert-butyl 3-fluoroazetidine-1-carboxylate
- tert-butyl 3-fluoro-3-(hydroxymethyl)azetidine-1-carboxylate
- tert-butyl 3-aminoazetidine-1-carboxylate
- tert-butyl 3-aminoazetidine-1-carboxylate (2)
- tert-butyl 3-amino-3-(hydroxymethyl)azetidine-1-carboxylate