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

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

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

tert-butyl 4-(4-fluoro-3-methylbenzyl)piperazine-1-carboxylate

tert-butyl 4-cinnamylpiperazine-1-carboxylate

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

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

tert-butyl 4-((4-methylthiazol-5-yl)methyl)piperazine-1-carboxylate

tert-butyl 4-((5-(hydroxymethyl)furan-2-yl)methyl)piperazine-1-carboxylate

tert-butyl 4-((3,5-dimethylisoxazol-4-yl)methyl)piperazine-1-carboxylate

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

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

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

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

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

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