Cesium carbonate → 4-Chloro-2-{4-[2-(5-methyl-2-phenyl-oxazol-4-yl)-ethoxy]-benzenesulfonyl-(t-butoxycarbonyl)amino}-benzoic acid methyl ester

HRID 643991Notes

Reaction equation

HRID 643991 reaction equation
[CH3:1][O:2][C:3](=[O:29])[C:4]1[CH:9]=[CH:8][C:7]([Cl:10])=[CH:6][C:5]=1[N:11]([S:19]([C:22]1[CH:27]=[CH:26][C:25]([OH:28])=[CH:24][CH:23]=1)(=[O:21])=[O:20])[C:12]([O:14][C:15]([CH3:18])([CH3:17])[CH3:16])=[O:13].[CH3:30][C:31]1[O:35][C:34]([C:36]2[CH:41]=[CH:40][CH:39]=[CH:38][CH:37]=2)=[N:33][C:32]=1[CH2:42][CH2:43]OS(C)(=O)=O.C(=O)([O-])[O-].[Cs+].[Cs+]>CN(C=O)C.CCOC(C)=O>[CH3:1][O:2][C:3](=[O:29])[C:4]1[CH:9]=[CH:8][C:7]([Cl:10])=[CH:6][C:5]=1[N:11]([S:19]([C:22]1[CH:23]=[CH:24][C:25]([O:28][CH2:43][CH2:42][C:32]2[N:33]=[C:34]([C:36]3[CH:41]=[CH:40][CH:39]=[CH:38][CH:37]=3)[O:35][C:31]=2[CH3:30])=[CH:26][CH:27]=1)(=[O:21])=[O:20])[C:12]([O:14][C:15]([CH3:18])([CH3:16])[CH3:17])=[O:13]

Participants

6

Reactant 3

HCID 10796Cesium carbonateHCID 105407732-(5-Methyl-2-phenyl-1,3-oxazol-4-yl)ethyl methanesulfonateHCID 685792122-[(4-Hydroxybenzene-sulfonyl)-(t-butoxycarbonyl)amino]4-chloro-benzoic acid methyl ester

Product 1

HCID 685793864-Chloro-2-{4-[2-(5-methyl-2-phenyl-oxazol-4-yl)-ethoxy]-benzenesulfonyl-(t-butoxycarbonyl)amino}-benzoic acid methyl ester

Reagents, catalysts & solvents 2

HCID 6228DimethylformamideSolventHCID 8857Ethyl AcetateSolvent

Procedure

A mixture of the title E compound, 2-[(4-hydroxybenzenesulfonyl)-(t-butoxycarbonyl)-amino]-4-chloro-benzoic acid methyl ester (300 mg, 0.73 mmol), the title F compound, methanesulfonic acid 2-(5-methyl-2-phenyl-oxazol-4-yl)-ethyl ester (246 mg, 0.87 mmol) and cesium carbonate (475 mg, 1.46 mmol) is stirred in DMF at 60° C. overnight. The mixture is cooled and the product is taken up in EtOAc. The solution is washed with brine, dried over anhydrous magnesium sulfate, and concentrated to give the crude product which is purified by flash chromatography on silica gel using an EtOAc (15%)-hexane (85%) mixture as the eluent to afford 4-chloro-2-{4-[2-(5-methyl-2-phenyl-oxazol-4-yl)-ethoxy]-benzenesulfonyl-(t-butoxycarbonyl)amino}benzoic acid methyl ester as a white foam.

Workup

  1. temperatureThe mixture is cooled
  2. washThe solution is washed with brine
  3. dry with materialdried over anhydrous magnesium sulfate
  4. concentrationconcentrated
  5. customto give the crude product which
  6. customis purified by flash chromatography on silica gel using an EtOAc (15%)-hexane (85%) mixture as the eluent

Sources & evidence

ORD record
ord-109a54823d1d454090ca9b2c007d3fa9
Source dataset
uspto-grants-2010_04
Patent number
US07700637B2

Reaction notes

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