tert-butyl (2S,4R)-4-hydroxycarbonyl-2-(tert-butyl)-1,3-oxazolane-3-carboxylate

4-benzyl 3-tert-butyl (2S,4S)-2-tert-butyl-4-((R)-1-(4-methoxybenzyloxy)allyl)oxazolidine-3,4-dicarboxylate

4-benzyl 3-tert-butyl (2S,4S)-2-tert-butyl-4-((R)-1-hydroxyallyl)oxazolidine-3,4-dicarboxylate

3-tert-butyl 4-((E)-3-methoxyallyl) (2S,4R)-2-tert-butyloxazolidine-3,4-dicarboxylate

4-((E)-3-(benzyloxy)allyl) 3-tert-butyl (2S,4R)-2-tert-butyloxazolidine-3,4-dicarboxylate