Tert-butyl 4-((2-chloropyrido[2,3-d]pyrimidin-4-yl)amino)piperidine-1-carboxylate
Tert-butyl 6'-chloro-1',2'-dihydrospiro[piperidine-4,3'-pyrrolo[3,2-b]pyridine]-1-carboxylate
Tert-butyl 3-(pyridin-2-yl)piperazine-1-carboxylate
Tert-butyl 2-(((5-bromopyridin-3-yl)oxy)methyl)azetidine-1-carboxylate