1-tert-butyl 2-methyl 3-oxopyrrolidine-1,2-dicarboxylate

1-tert-butyl 2-methyl 4,4-difluoropyrrolidine-1,2-dicarboxylate

1-tert-butyl 2-methyl 4,5-dihydro-1H-pyrrole-1,2-dicarboxylate

1-tert-butyl 2-methyl 4-(methanesulfonyloxy)pyrrolidine-1,2-dicarboxylate

1-tert-butyl 2-methyl 4-(tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-pyrrole-1,2-dicarboxylate

1-tert-butyl 2-methyl 4-(tetramethyl-1,3,2-dioxaborolan-2-yl)-2,5-dihydro-1H-pyrrole-1,2-dicarboxylate

1-tert-butyl 2-methyl 4-aminopiperidine-1,2-dicarboxylate

1-tert-butyl 2-methyl 4-bromo-1H-pyrrole-1,2-dicarboxylate

1-tert-butyl 2-methyl 4-methyl-2,5-dihydro-1H-pyrrole-1,2-dicarboxylate

1-tert-butyl 2-methyl 5,5-dimethyl-2,5-dihydro-1H-pyrrole-1,2-dicarboxylate

1-tert-butyl 2-methyl 5-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1,2,3,4-tetrahydropyridine-1,2-dicarboxylate

1-tert-butyl 2-methyl 5-(4-fluorophenyl)-1H,2H,3H,4H,4aH,5H,6H,10bH-benzo[h]1,6-naphthyridine-1,2-dicarboxylate

1-tert-butyl 2-methyl 5-(4-methoxyphenyl)pyrrolidine-1,2-dicarboxylate

1-tert-butyl 2-methyl 5-(benzenesulfonyl)pyrrolidine-1,2-dicarboxylate

1-tert-butyl 2-methyl 5-(hydroxymethyl)-1,2,3,4-tetrahydropyridine-1,2-dicarboxylate

1-tert-butyl 2-methyl 5-(trifluoroacetyl)-1,2,3,4-tetrahydropyridine-1,2-dicarboxylate

1-tert-butyl 2-methyl 5-bromo-1,2,3,4-tetrahydropyridine-1,2-dicarboxylate

1-tert-butyl 2-methyl 5-fluoro-6-methoxypiperidine-1,2-dicarboxylate

1-tert-butyl 2-methyl 5-formyl-1,2,3,4-tetrahydropyridine-1,2-dicarboxylate

1-tert-butyl 2-methyl 5-oxo-3-(trifluoromethyl)pyrrolidine-1,2-dicarboxylate

1-tert-butyl 2-methyl 5-oxopiperidine-1,2-dicarboxylate

1-tert-butyl 2-methyl azetidine-1,2-dicarboxylate

1-tert-butyl 2-methyl piperidine-1,2-dicarboxylate

1-tert-butyl 2-methyl pyrrolidine-1,2-dicarboxylate

1-tert-butyl 3,3-diethyl azetidine-1,3,3-tricarboxylate

1-tert-butyl 3,4-diethyl pyrrolidine-1,3,4-tricarboxylate

1-tert-butyl 3-(1,3-dioxo-2,3-dihydro-1H-isoindol-2-yl) azetidine-1,3-dicarboxylate

1-tert-butyl 3-(1,3-dioxo-2,3-dihydro-1H-isoindol-2-yl) piperidine-1,3-dicarboxylate

1-tert-butyl 3-(1,3-dioxo-2,3-dihydro-1H-isoindol-2-yl) pyrrolidine-1,3-dicarboxylate

1-tert-butyl 3-chloromethyl azetidine-1,3-dicarboxylate

1-tert-butyl 3-ethyl (3R)-piperidine-1,3-dicarboxylate

1-tert-butyl 3-ethyl (4R)-4-hydroxypiperidine-1,3-dicarboxylate

1-tert-butyl 3-ethyl 1,2,3,6-tetrahydropyridine-1,3-dicarboxylate

1-tert-butyl 3-ethyl 1,2,5,6-tetrahydropyridine-1,3-dicarboxylate

1-tert-butyl 3-ethyl 2,5-dihydro-1H-pyrrole-1,3-dicarboxylate

1-tert-butyl 3-ethyl 2-(3-nitropyridin-4-yl)propanedioate

1-tert-butyl 3-ethyl 2-acetamidopropanedioate

1-tert-butyl 3-ethyl 3-benzyl-4-oxopiperidine-1,3-dicarboxylate

1-tert-butyl 3-ethyl 4,5-dihydro-1H-pyrrole-1,3-dicarboxylate

1-tert-butyl 3-ethyl 4-(tetramethyl-1,3,2-dioxaborolan-2-yl)-1,2,5,6-tetrahydropyridine-1,3-dicarboxylate

1-tert-butyl 3-ethyl 4-(tetramethyl-1,3,2-dioxaborolan-2-yl)pyrrolidine-1,3-dicarboxylate

1-tert-butyl 3-ethyl 4-(trifluoromethanesulfonyloxy)-2,5-dihydro-1H-pyrrole-1,3-dicarboxylate

1-tert-butyl 3-ethyl 4-aminopyrrolidine-1,3-dicarboxylate hydrochloride

1-tert-butyl 3-ethyl 4-hydroxypiperidine-1,3-dicarboxylate

1-tert-butyl 3-ethyl 4-methyl-2,5-dihydro-1H-pyrrole-1,3-dicarboxylate