Ethyl Acetate → Ethyl 4-(((2,4-dimethoxybenzyl)(2-ethoxy-2-oxoethyl)amino)methyl)-3-(thiophen-2-yl)isoxazole-5-carboxylate

HRID 2388190Notes

Reaction equation

HRID 2388190 reaction equation
Br[CH2:2][C:3]1[C:4]([C:13]2[S:14][CH:15]=[CH:16][CH:17]=2)=[N:5][O:6][C:7]=1[C:8]([O:10][CH2:11][CH3:12])=[O:9].[CH2:18]([O:20][C:21](=[O:35])[CH2:22][NH:23][CH2:24][C:25]1[CH:30]=[CH:29][C:28]([O:31][CH3:32])=[CH:27][C:26]=1[O:33][CH3:34])[CH3:19].C(=O)([O-])[O-].[K+].[K+].CCOC(C)=O>CN(C=O)C.O>[CH3:34][O:33][C:26]1[CH:27]=[C:28]([O:31][CH3:32])[CH:29]=[CH:30][C:25]=1[CH2:24][N:23]([CH2:2][C:3]1[C:4]([C:13]2[S:14][CH:15]=[CH:16][CH:17]=2)=[N:5][O:6][C:7]=1[C:8]([O:10][CH2:11][CH3:12])=[O:9])[CH2:22][C:21]([O:20][CH2:18][CH3:19])=[O:35]

Participants

7

Reactant 4

HCID 8857Ethyl AcetateHCID 11430Potassium CarbonateHCID 19895532Ethyl 2-(2,4-dimethoxybenzylamino)acetateHCID 67530400Ethyl 4-(bromomethyl)-3-(thiophen-2-yl)isoxazole-5-carboxylate

Product 1

HCID 67530282Ethyl 4-(((2,4-dimethoxybenzyl)(2-ethoxy-2-oxoethyl)amino)methyl)-3-(thiophen-2-yl)isoxazole-5-carboxylateYield 27.3%

Reagents, catalysts & solvents 2

HCID 962WaterSolventHCID 6228DimethylformamideSolvent

Procedure

Ethyl 4-(bromomethyl)-3-(thiophen-2-yl)isoxazole-5-carboxylate (16.5 mmol) was dissolved in 35 mL of DMF. N-(2,4-dimethoxybenzyl)glycine ethyl ester (4.2 g, 16.5 mmol) and potassium carbonate (4.5 g, 32.9 mmol) were added, and the mixture was stirred at room temperature for 16 h. EtOAc (100 mL) and water (100 mL) were added and the aqueous layer was extracted with additional EtOAc. The combined organic layer was washed with water and brine, and dried over MgSO4. After solvent was removed in vacuo, the crude was purified by flash chromatography (0-40% EtOAc/hexanes) to give 2.2 g of the title compound. MS: (+) m/z 489.44 (M+1).

Workup

  1. extractionthe aqueous layer was extracted with additional EtOAc
  2. washThe combined organic layer was washed with water and brine
  3. dry with materialdried over MgSO4
  4. customAfter solvent was removed in vacuo
  5. customthe crude was purified by flash chromatography (0-40% EtOAc/hexanes)

Sources & evidence

ORD record
ord-de17dda57e82431caaff7c69ad99f9fb
Source dataset
uspto-grants-2012_09
Patent number
US08269008B2

Reaction notes

Loading…