tert-butyl 6-(2-oxopiperidin-1-yl)-1,4-oxazepane-4-carboxylate
3-chloro-5-fluoroaniline
tert-butyl 6-(5-bromopentanamido)-1,4-oxazepane-4-carboxylate
tert-butyl 6-amino-1,4-oxazepane-4-carboxylate
tert-butyl 6-(hydroxyimino)-1,4-oxazepane-4-carboxylate