Cesium carbonate → 4-((S)-4-tert-Butoxycarbonyl-2-{[5-(1-ethoxycarbonyl-cyclobutoxy)-1-phenyl-1H-pyrazole-3-carbonyl]-amino}-butyryl)-piperazine-1-carboxylic acid ethyl ester

HRID 1908598Notes

Reaction equation

HRID 1908598 reaction equation
[CH2:1]([O:3][C:4]([N:6]1[CH2:11][CH2:10][N:9]([C:12](=[O:38])[C@@H:13]([NH:23][C:24]([C:26]2[CH:30]=[C:29]([OH:31])[N:28]([C:32]3[CH:37]=[CH:36][CH:35]=[CH:34][CH:33]=3)[N:27]=2)=[O:25])[CH2:14][CH2:15][C:16]([O:18][C:19]([CH3:22])([CH3:21])[CH3:20])=[O:17])[CH2:8][CH2:7]1)=[O:5])[CH3:2].C(=O)([O-])[O-].[Cs+].[Cs+].[CH2:45]([O:47][C:48]([C:50]1(Br)[CH2:53][CH2:52][CH2:51]1)=[O:49])[CH3:46]>CN(C=O)C.O>[CH2:1]([O:3][C:4]([N:6]1[CH2:11][CH2:10][N:9]([C:12](=[O:38])[C@@H:13]([NH:23][C:24]([C:26]2[CH:30]=[C:29]([O:31][C:50]3([C:48]([O:47][CH2:45][CH3:46])=[O:49])[CH2:53][CH2:52][CH2:51]3)[N:28]([C:32]3[CH:37]=[CH:36][CH:35]=[CH:34][CH:33]=3)[N:27]=2)=[O:25])[CH2:14][CH2:15][C:16]([O:18][C:19]([CH3:22])([CH3:21])[CH3:20])=[O:17])[CH2:8][CH2:7]1)=[O:5])[CH3:2]

Participants

6

Reactant 3

HCID 10796Cesium carbonateHCID 97595Ethyl 1-bromocyclobutanecarboxylateHCID 178473388HCID 178473388, compound

Product 1

HCID 669201254-((S)-4-tert-Butoxycarbonyl-2-{[5-(1-ethoxycarbonyl-cyclobutoxy)-1-phenyl-1H-pyrazole-3-carbonyl]-amino}-butyryl)-piperazine-1-carboxylic acid ethyl ester

Reagents, catalysts & solvents 2

HCID 962WaterSolventHCID 6228DimethylformamideSolvent

Conditions

Temperature
100 °C

Procedure

To a solution of 1.5 g of 4-{(S)-4-tert-Butoxycarbonyl-2-[(5-hydroxy-1-phenyl-1H-pyrazole-3-carbonyl)-amino]-butyryl}-piperazine-1-carboxylic acid ethyl ester in 20 ml of DMF, 1.8 g of cesium carbonate and 1.2 g of 1-Bromo-cyclobutanecarboxylic acid ethyl ester was added and heated to 100° C. for 2 h. Then, the reaction mixture was diluted with water and extracted with ethyl acetate (3×150 ml). The combined organic phases were dried over MgSO4 and the solvents were removed under reduced pressure. The crude product was purified by chromatography on silica gel eluting with a gradient of n-heptane/ethyl acetate. The fractions containing the product were combined and the solvent evaporated under reduced pressure. Yield: 860 mg.

Workup

  1. extractionextracted with ethyl acetate (3×150 ml)
  2. dry with materialThe combined organic phases were dried over MgSO4
  3. customthe solvents were removed under reduced pressure
  4. customThe crude product was purified by chromatography on silica gel eluting with a gradient of n-heptane/ethyl acetate
  5. additionThe fractions containing the product
  6. customthe solvent evaporated under reduced pressure

Sources & evidence

ORD record
ord-32aa16bfe3264b29be7894b74d855f86
Source dataset
uspto-grants-2013_12
Patent number
US08598179B2

Reaction notes

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