Water → Ethyl 2-(2-thioxo-2,3-dihydrobenzoxazol-5-yl)propionate

HRID 660317Notes

Reaction equation

HRID 660317 reaction equation
[CH2:1]([O:3][C:4](=[O:15])[CH:5]([C:7]1[CH:12]=[CH:11][C:10]([OH:13])=[C:9]([NH2:14])[CH:8]=1)[CH3:6])[CH3:2].C1C=CC(O[C:23](Cl)=[S:24])=CC=1.C1CCN2C(=NCCC2)CC1.O>CN(C=O)C>[CH2:1]([O:3][C:4](=[O:15])[CH:5]([C:7]1[CH:12]=[CH:11][C:10]2[O:13][C:23](=[S:24])[NH:14][C:9]=2[CH:8]=1)[CH3:6])[CH3:2]

Participants

6

Reactant 4

HCID 962WaterHCID 70498Phenyl thioxochloroformateHCID 811841,8-Diazabicyclo(5.4.0)undec-7-eneHCID 12202638Ethyl 3-amino-4-hydroxy-phenyl-propionate

Product 1

HCID 20319623Ethyl 2-(2-thioxo-2,3-dihydrobenzoxazol-5-yl)propionate

Reagents, catalysts & solvents 1

HCID 6228DimethylformamideSolvent

Procedure

A solution of 2-(3-amino-4-hydroxy-phenyl)-propionic acid ethyl ester (370 mg) in DMF (2 mL) was added phenyl chlorothionoformate (380 mg in DMF), and DBU (540 mg, in DMF) at room temperature. The reaction mixture was stirred for 16 h at room temperature and water was added to this mixture. The resulting mixture was extracted with ethyl ether. The combined organic layer was dried over magnesium sulfate, filtered and concentrated in vacuo. The resulting residue was chromatographed on silica gel (n-Hex:EtOAc=4:1) to afford the product as white solid. (130 mg, 29.2%)

Workup

  1. extractionThe resulting mixture was extracted with ethyl ether
  2. dry with materialThe combined organic layer was dried over magnesium sulfate
  3. filtrationfiltered
  4. concentrationconcentrated in vacuo
  5. customThe resulting residue was chromatographed on silica gel (n-Hex:EtOAc=4:1)

Sources & evidence

ORD record
ord-d47d54ef4c0341d2af21bb3d8816303e
Source dataset
uspto-grants-2011_12
Patent number
US08084484B2

Reaction notes

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