> product > Diversity Oriented Building Blocks > By Structure > Hetero 6-membered Rings + > Piperazines
tert-butyl 4-(2-aminoethyl)piperazine-1-carboxylate
tert-butyl 3-ethylpiperazine-1-carboxylate
(3S)-1-benzyl-3-ethylpiperazine
tert-butyl 3-(hydroxymethyl)piperazine-1-carboxylate
2-methyl-2-(4-oxetan-3-yl-piperazin-1-yl)-propionaldehyde
![tert-butyl 4-[3-(methanesulfonyloxy)propyl]piperazine-1-carboxylate hydrochloride](images/201806/source_img/11685_G_1528158624651.jpg)
tert-butyl 4-[3-(methanesulfonyloxy)propyl]piperazine-1-carboxylate hydrochloride
1-(oxetan-3-yl)piperazine hemioxalate
trans tert-butyl (2R,5S)-2,5-dimethylpiperazine-1-carboxylate hydrochloride
tert-butyl (2S,5R)-2,5-dimethylpiperazine-1-carboxylate hydrochloride
(2R,5S)-1,2,5-trimethylpiperazine; oxalic acid
tert-butyl 4-(1-ethoxycyclopropanecarbonyl)piperazine-1-carboxylate
tert-butyl (3R)-3-(hydroxymethyl)piperazine-1-carboxylate
tert-butyl (3S)-3-(hydroxymethyl)piperazine-1-carboxylate
1-tert-butyl 3-methyl (3S)-piperazine-1,3-dicarboxylate
tert-butyl (2S)-2-methylpiperazine-1-carboxylate
tert-butyl 2-methylpiperazine-1-carboxylate
![tert-butyl 3-[4-(trifluoromethyl)phenyl]piperazine-1-carboxylate](images/201806/source_img/11495_G_1528158613641.jpg)
tert-butyl 3-[4-(trifluoromethyl)phenyl]piperazine-1-carboxylate
tert-butyl 3-oxopiperazine-1-carboxylate
tert-butyl 4-(1-hydroxycyclopropanecarbonyl)piperazine-1-carboxylate