tert-butyl 3-(4-acetyl-1-methyl-1,2,5,6-tetrahydropyridin-2-yl)-1H-indole-1-carboxylate

benzyl 2-(1H-indol-3-yl)-4-oxo-3,4-dihydropyridine-1(2H)-carboxylate

tert-butyl 3-(1-((benzyloxy)carbonyl)-4-oxo-1,2,3,4-tetrahydropyridin-2-yl)-1H-indole-1-carboxylate

tert-butyl 3-(1-((benzyloxy)carbonyl)-4-(((trifluoromethyl)sulfonyl)oxy)-1,2,5,6-tetrahydropyridin-2-yl)-1H-indole-1-carboxylate

tert-butyl 3-(4-acetyl-1-((benzyloxy)carbonyl)-1,2,5,6-tetrahydropyridin-2-yl)-1H-indole-1-carboxylate