tert-Butyl piperazine-1-carboxylate → tert-butyl 4-((6-((3-ethyl-4-(imidazo[1,2-a]pyridine-3-carboxamido)-1H-indazol-1-yl)methyl)pyridin-2-yl)methyl)piperazine-1-carboxylate

HRID 79291Notes

Reaction equation

HRID 79291 reaction equation
[CH2:1]([C:3]1[C:11]2[C:6](=[CH:7][CH:8]=[CH:9][C:10]=2[NH:12][C:13]([C:15]2[N:19]3[CH:20]=[CH:21][CH:22]=[CH:23][C:18]3=[N:17][CH:16]=2)=[O:14])[N:5]([CH2:24][C:25]2[CH:30]=[CH:29][CH:28]=[C:27]([CH:31]=O)[N:26]=2)[N:4]=1)[CH3:2].C(O[BH-](OC(=O)C)OC(=O)C)(=O)C.[Na+].[N:47]1([C:53]([O:55][C:56]([CH3:59])([CH3:58])[CH3:57])=[O:54])[CH2:52][CH2:51][NH:50][CH2:49][CH2:48]1>ClCCl.CO>[CH2:1]([C:3]1[C:11]2[C:6](=[CH:7][CH:8]=[CH:9][C:10]=2[NH:12][C:13]([C:15]2[N:19]3[CH:20]=[CH:21][CH:22]=[CH:23][C:18]3=[N:17][CH:16]=2)=[O:14])[N:5]([CH2:24][C:25]2[N:26]=[C:27]([CH2:31][N:50]3[CH2:51][CH2:52][N:47]([C:53]([O:55][C:56]([CH3:59])([CH3:58])[CH3:57])=[O:54])[CH2:48][CH2:49]3)[CH:28]=[CH:29][CH:30]=2)[N:4]=1)[CH3:2]

Participants

5

Reactant 3

HCID 143452tert-Butyl piperazine-1-carboxylateHCID 5049666Sodium triacetoxyborohydrideHCID 86672209N-(3-ethyl-1-((6-formylpyridin-2-yl)methyl)-1H-indazol-4-yl)imidazo[1,2-a]pyridine-3-carboxamide

Product 1

HCID 67261333tert-butyl 4-((6-((3-ethyl-4-(imidazo[1,2-a]pyridine-3-carboxamido)-1H-indazol-1-yl)methyl)pyridin-2-yl)methyl)piperazine-1-carboxylateYield 45%

Reagents, catalysts & solvents 1

HCID 21226129Dichloromethane methanolSolvent

Procedure

To a mixture of N-(3-ethyl-1-((6-formylpyridin-2-yl)methyl)-1H-indazol-4-yl)imidazo[1,2-a]pyridine-3-carboxamide (20 mg, 0.0471 mmol) and sodium triacetoxyborohydride (49.9 mg, 0.236 mmol) in a 1:1 mixture of dichloromethane/methanol (1 mL) was added tert-butyl piperazine-1-carboxylate (10.5 mg, 0.0565 mmol). The mixture was stirred for 30 minutes at ambient temperature. The solvent was removed under reduced pressure and the residue was purified using preparative thin layer chromatography on silica, eluting with 12% methanol and 0.5% ammonium hydroxide in dichloromethane to give the desired product (12.6 mg).

Workup

  1. customThe solvent was removed under reduced pressure
  2. customthe residue was purified
  3. washeluting with 12% methanol and 0.5% ammonium hydroxide in dichloromethane

Sources & evidence

ORD record
ord-739eef8958d74bdebd0ceda2c7add3ef
Source dataset
uspto-grants-2014_09
Patent number
US08841455B2

Reaction notes

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