methyl 2-diphenylphosphorylpiperidine-1-carboxylate

1-ethyl-1,5,6,7-tetrahydro-[1,3]oxazolo[3,4-a]pyridin-3-one

methyl 2-methylpiperidine-1-carboxylate

methyl 3-acetyloxy-2-hydroxypiperidine-1-carboxylate

α,β-diacetoxy-N-(methoxycarbonyl)piperidine