tert-butyl 4-((2,2-difluorobenzo[d][1,3]dioxol-5-yl)methyl)piperazine-1-carboxylate

tert-butyl 4-((6-bromopyridin-2-yl)methyl)piperazine-1-carboxylate

tert-butyl 4-(2-bromobenzyl)piperazine-1-carboxylate

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

tert-butyl 4-(3,4-dimethoxybenzyl)piperazine-1-carboxylate

tert-butyl 4-((2,3-dihydrobenzo[b][1,4]dioxin-6-yl)methyl)piperazine-1-carboxylate

tert-butyl 4-(benzo[b]thiophen-2-ylmethyl)piperazine-1-carboxylate

tert-butyl 4-(4-(prop-2-yn-1-yloxy)benzyl)piperazine-1-carboxylate

tert-butyl 4-((1-methyl-1H-indol-3-yl)methyl)piperazine-1-carboxylate

tert-butyl 4-((5-chloro-1,3-dimethyl-1H-pyrazol-4-yl)methyl)piperazine-1-carboxylate

tert-butyl 4-(2,6-difluoro-4-hydroxybenzyl)piperazine-1-carboxylate

tert-butyl 4-(quinolin-2-ylmethyl)piperazine-1-carboxylate

tert-butyl 4-(3-chloro-4-hydroxybenzyl)piperazine-1-carboxylate

tert-butyl 4-(5-chloro-2-hydroxybenzyl)piperazine-1-carboxylate

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

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