tert-butyl 4-((1-(tert-butoxycarbonyl)piperidin-4-yl)methyl)piperazine-1-carboxylate

tert-butyl 4-(4-iodobenzyl)piperazine-1-carboxylate

tert-butyl 4-((9-ethyl-9H-carbazol-3-yl)methyl)piperazine-1-carboxylate

tert-butyl 4-(2-(benzyloxy)benzyl)piperazine-1-carboxylate

tert-butyl 4-(anthracen-9-ylmethyl)piperazine-1-carboxylate

tert-butyl 4-(4-(4-methylpiperazin-1-yl)benzyl)piperazine-1-carboxylate

tert-butyl 4-((1-benzylpiperidin-4-yl)methyl)piperazine-1-carboxylate

tert-butyl 4-(4-bromo-2-fluorobenzyl)piperazine-1-carboxylate

tert-butyl 4-(3-phenoxybenzyl)piperazine-1-carboxylate

tert-butyl 4-(2,3,4-trimethoxybenzyl)piperazine-1-carboxylate

tert-butyl 4-(3,4,5-trimethoxybenzyl)piperazine-1-carboxylate

tert-butyl 4-(2,4-dinitrobenzyl)piperazine-1-carboxylate

tert-butyl 4-(5-allyl-2-hydroxy-3-methoxybenzyl)piperazine-1-carboxylate

tert-butyl 4-((2-chloroquinolin-3-yl)methyl)piperazine-1-carboxylate

tert-butyl 4-(4-morpholinobenzyl)piperazine-1-carboxylate

tert-butyl 4-methyl-4-((6-methylpyridin-2-yl)amino)piperidine-1-carboxylate