methyl (R)-2-tert-butyloxazolidine-4-carboxylate

3-tert-butyl 4-methyl (2S,4S)-2-tert-butyl-4-((R)-1-(benzyloxy)allyl)oxazolidine-3,4-dicarboxylate

4-benzyl 3-tert-butyl (2S,4S)-2-tert-butyl-4-((R,E)-1-hydroxy-12-oxooctadec-2-enyl)oxazolidine-3,4-dicarboxylate

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

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

(3S,6S,7aR,E)-methyl 7-((3R,4R)-5-(benzyloxy)-4-(tert-butyldimethylsilyloxy)-3-methylpentylidene)-3-tert-butyl-6-methyl-5-oxohexahydropyrrolo[1,2-c]oxazole-7a-carboxylate

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

(3S,7aR)-methyl 7-((3R,4R)-5-(benzyloxy)-4-(tert-butyldimethylsilyloxy)-3-methylpentyl)-3-tert-butyl-6-methyl-5-oxo-1,3,5,7a-tetrahydropyrrolo[1,2-c]oxazole-7a-carboxylate

(3S,6R,7aR,E)-methyl 7-((3R,4R)-5-(benzyloxy)-4-(tert-butyldimethylsilyloxy)-3-methylpentylidene)-3-tert-butyl-6-methyl-5-oxohexahydropyrrolo[1,2-c]oxazole-7a-carboxylate

(3S,7aS)-methyl 3-tert-butyl-6-methyl-5-oxo-7-(trifluoromethylsulfonyloxy)-1,3,5,7a-tetrahydropyrrolo[1,2-c]oxazole-7a-carboxylate

(3S,7aR)-methyl 7-((3R,4R)-5-(benzyloxy)-4-hydroxy-3-methylpentyl)-3-tert-butyl-6-methyl-5-oxo-1,3,5,7a-tetrahydropyrrolo[1,2-c]oxazole-7a-carboxylate

(3S,6R,6aS,7S,9aS)-7-[(2R,3R)-4-(benzyloxy)-3-{[tert-butyl(dimethyl)silyl]oxy}-2-methylbutyl]-3-tert-butyl-6a-hydroxy-6-methyldihydrofuro[3',4':2,3]pyrrolo[1,2-c][1,3]oxazole-5,9(6H)-dione

(3S,7aR)-methyl 7-((3R,4R,1E)-5-(benzyloxy)-4-hydroxy-3-methylpent-1-enyl)-3-tert-butyl-6-methyl-5-oxo-1,3,5,7a-tetrahydropyrrolo[1,2-c]oxazole-7a-carboxylate

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

(3S,6S,6aS,7S,9aS)-7-[(2R,3R)-4-(benzyloxy)-3-{[tert-butyl(dimethyl)silyl]oxy}-2-methylbutyl]-3-tert-butyl-6a-hydroxy-6-methyldihydrofuro[3',4':2,3]pyrrolo[1,2-c][1,3]oxazole-5,9(6H)-dione

(3S,7aR)-methyl 7-((3R,4R,1Z)-5-(benzyloxy)-4-hydroxy-3-methylpent-1-enyl)-3-tert-butyl-6-methyl-5-oxo-1,3,5,7a-tetrahydropyrrolo[1,2-c]oxazole-7a-carboxylate

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

methyl (3S,7aS)-3-(tert-butyl)-7-hydroxy-6-methyl-5-oxo-1H,3H-pyrrolo[1,2-c]oxazole-7a(5H)-carboxylate

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