Cesium carbonate → 2-(1H-pyrazol-4-ylamino)-5-(4-(4-(tert-butoxycarbonyl)piperazin-1-yl)phenyl)oxazole-4-carboxylic acid

HRID 714999Notes

Reaction equation

HRID 714999 reaction equation
C([O:3][C:4]([C:6]1[N:7]=[C:8](I)[O:9][C:10]=1[C:11]1[CH:16]=[CH:15][C:14]([N:17]2[CH2:22][CH2:21][N:20]([C:23]([O:25][C:26]([CH3:29])([CH3:28])[CH3:27])=[O:24])[CH2:19][CH2:18]2)=[CH:13][CH:12]=1)=[O:5])C.[NH2:31][C:32]1[CH:33]=[N:34][N:35](C(OC(C)(C)C)=O)[CH:36]=1.C(=O)([O-])[O-].[Cs+].[Cs+].CC1(C)C2C=CC=C(P(C3C=CC=CC=3)C3C=CC=CC=3)C=2OC2C1=CC=CC=2P(C1C=CC=CC=1)C1C=CC=CC=1>CC(O)(C)C.O1CCOCC1.C1C=CC(/C=C/C(/C=C/C2C=CC=CC=2)=O)=CC=1.C1C=CC(/C=C/C(/C=C/C2C=CC=CC=2)=O)=CC=1.C1C=CC(/C=C/C(/C=C/C2C=CC=CC=2)=O)=CC=1.[Pd].[Pd]>[NH:34]1[CH:33]=[C:32]([NH:31][C:8]2[O:9][C:10]([C:11]3[CH:16]=[CH:15][C:14]([N:17]4[CH2:22][CH2:21][N:20]([C:23]([O:25][C:26]([CH3:29])([CH3:27])[CH3:28])=[O:24])[CH2:19][CH2:18]4)=[CH:13][CH:12]=3)=[C:6]([C:4]([OH:3])=[O:5])[N:7]=2)[CH:36]=[N:35]1

Participants

8

Reactant 4

HCID 10796Cesium carbonateHCID 6360441,1'-(9,9-Dimethyl-9H-xanthene-4,5-diyl)bis(1,1-diphenylphosphine)HCID 59587648tert-butyl 4-amino-1H-pyrazole-1-carboxylateHCID 68522092Tert-butyl 4-(4-(4-(ethoxycarbonyl)-2-iodooxazol-5-yl)phenyl)piperazine-1-carboxylate

Product 1

HCID 595875682-(1H-pyrazol-4-ylamino)-5-(4-(4-(tert-butoxycarbonyl)piperazin-1-yl)phenyl)oxazole-4-carboxylic acidYield 26.1%

Reagents, catalysts & solvents 3

HCID 9811564Bis(dibenzylideneacetone)palladiumCatalystHCID 6386tert-ButanolSolventHCID 312751,4-DioxaneSolvent

Procedure

A mixture of tert-butyl 4-(4-(4-(ethoxycarbonyl)-2-iodooxazol-5-yl)phenyl)piperazine-1-carboxylate (0.150 g, 0.28 mmol), tert-butyl 4-amino-1H-pyrazole-1-carboxylate (0.261 g, 1.42 mmol), cesium carbonate (0.462 g, 2.39 mmol), tris(dibenzylideneacetone)dipalladium(0) (0.012 g, 0.013 mmol) and 9,9-dimethyl-4,5-bis(diphenylphosphino)xanthene (0.0165 g, 0.029 mmol) in tBuOH (4.5 ml) and dioxane (4.5 ml) was degassed, placed under a nitrogen atmosphere and then stirred under reflux overnight. The reaction mixture was passed through a MP-SH cartridge and the solvent removed in vacuo. The residue was partitioned between water and EtOAc and the aqueous phase extracted with EtOAc and DCM. The combined organic phases were dried over MgSO4 and the solvent removed in vacuo. The residue was purified by preparative HPLC to afford 2-(1H-pyrazol-4-ylamino)-5-(4-(4-(tert-butoxycarbonyl)piperazin-1-yl)phenyl)oxazole-4-carboxylic acid (0.033 g, 0.073 mmol, 26%). LCMS (2) Rt: 1.68 min; m/z (ES+) 455.

Workup

  1. customwas degassed
  2. temperatureunder reflux overnight
  3. customthe solvent removed in vacuo
  4. customThe residue was partitioned between water and EtOAc
  5. extractionthe aqueous phase extracted with EtOAc and DCM
  6. dry with materialThe combined organic phases were dried over MgSO4
  7. customthe solvent removed in vacuo
  8. customThe residue was purified by preparative HPLC

Sources & evidence

ORD record
ord-49cba8604e96462b96fc2cc58820ecea
Source dataset
uspto-grants-2015_11
Patent number
US09187465B2

Reaction notes

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