[N+:1]([C:4]1[CH:12]=[CH:11][CH:10]=[C:9]2[C:5]=1[CH:6]=[N:7][NH:8]2)([O-:3])=[O:2].[H-].[Na+].S(O[CH2:26][CH:27]1[CH2:32][CH2:31][CH2:30][N:29]([C:33]([O:35][C:36]([CH3:39])([CH3:38])[CH3:37])=[O:34])[CH2:28]1)(C1C=CC(C)=CC=1)(=O)=O>CC(N(C)C)=O.O>[N+:1]([C:4]1[CH:12]=[CH:11][CH:10]=[C:9]2[C:5]=1[CH:6]=[N:7][N:8]2[CH2:26][CH:27]1[CH2:32][CH2:31][CH2:30][N:29]([C:33]([O:35][C:36]([CH3:37])([CH3:39])[CH3:38])=[O:34])[CH2:28]1)([O-:3])=[O:2]To a solution of 4-nitro-1H-indazole (0.200 g, 1.23 mmol) in DMA (3 mL) was added 60% sodium hydride (0.074 g, 1.84 mmol) at ambient temperature. After 30 minutes, tert-butyl 3-(tosyloxymethyl)piperidine-1-carboxylate (0.544 g, 1.47 mmol) was added. The mixture was heated at 100° C. overnight, diluted with water, extracted with DCM, dried (phase separator silicone treated filter paper), concentrated and the residue purified on silica gel (10-50% EtOAc in DCM) to provide tert-butyl 3-((4-nitro-1H-indazol-1-yl)methyl)piperidine-1-carboxylate (0.176 g, 40% yield) as a yellow gum.
Wird geladen…