Ethyl bromopyruvate → ethyl 2-((E)-2-{3-[(4-{[2-(2-furyl)-5-methyl-1,3-oxazol-4-yl]methoxy}-3-methoxybenzyl)oxy]-1-phenyl-1H-pyrazol-4-yl}ethenyl)-1,3-thiazole-4-carboxylate

HRID 2221880Notes

Reaction equation

HRID 2221880 reaction equation
[O:1]1[CH:5]=[CH:4][CH:3]=[C:2]1[C:6]1[O:7][C:8]([CH3:39])=[C:9]([CH2:11][O:12][C:13]2[CH:36]=[CH:35][C:16]([CH2:17][O:18][C:19]3[C:23](/[CH:24]=[CH:25]/[C:26](=[S:28])[NH2:27])=[CH:22][N:21]([C:29]4[CH:34]=[CH:33][CH:32]=[CH:31][CH:30]=4)[N:20]=3)=[CH:15][C:14]=2[O:37][CH3:38])[N:10]=1.Br[CH2:41][C:42](=O)[C:43]([O:45][CH2:46][CH3:47])=[O:44]>C(O)C>[O:1]1[CH:5]=[CH:4][CH:3]=[C:2]1[C:6]1[O:7][C:8]([CH3:39])=[C:9]([CH2:11][O:12][C:13]2[CH:36]=[CH:35][C:16]([CH2:17][O:18][C:19]3[C:23](/[CH:24]=[CH:25]/[C:26]4[S:28][CH:41]=[C:42]([C:43]([O:45][CH2:46][CH3:47])=[O:44])[N:27]=4)=[CH:22][N:21]([C:29]4[CH:34]=[CH:33][CH:32]=[CH:31][CH:30]=4)[N:20]=3)=[CH:15][C:14]=2[O:37][CH3:38])[N:10]=1

Participants

4

Reactant 2

HCID 66144Ethyl bromopyruvateHCID 86605828(2E)-3-{3-[(4-{[2-(2-furyl)-5-methyl-1,3-oxazol-4-yl]methoxy}-3-methoxybenzyl)oxy]-1-phenyl-1H-pyrazol-4-yl}-2-propenethioamide

Product 1

HCID 69216223ethyl 2-((E)-2-{3-[(4-{[2-(2-furyl)-5-methyl-1,3-oxazol-4-yl]methoxy}-3-methoxybenzyl)oxy]-1-phenyl-1H-pyrazol-4-yl}ethenyl)-1,3-thiazole-4-carboxylateYield 66%

Reagents, catalysts & solvents 1

HCID 702EthanolSolvent

Procedure

A mixture of (2E)-3-{3-[(4-{[2-(2-furyl)-5-methyl-1,3-oxazol-4-yl]methoxy}-3-methoxybenzyl)oxy]-1-phenyl-1H-pyrazol-4-yl}-2-propenethioamide (0.45 gmmol), ethyl bromopyruvate (0.20 g) and ethanol (30 mL) was heated under reflux for 1 hr. The reaction mixture was concentrated and ethyl acetate was added to the residue. The organic layer was washed successively with saturated aqueous sodium hydrogen carbonate and saturated brine, dried over anhydrous magnesium sulfate and concentrated. The residue was subjected to silica gel column chromatography to give ethyl 2-((E)-2-{3-[(4-{[2-(2-furyl)-5-methyl-1,3-oxazol-4-yl]methoxy}-3-methoxybenzyl)oxy]-1-phenyl-1H-pyrazol-4-yl}ethenyl)-1,3-thiazole-4-carboxylate as yellow crystals (0.35 g, yield 66%) from a fraction eluted with ethyl acetate-hexane (2:1, v/v). Recrystallization from ethyl acetate-hexane gave yellow prism crystals. melting point: 156-157° C.

Workup

  1. temperaturewas heated
  2. temperatureunder reflux for 1 hr
  3. concentrationThe reaction mixture was concentrated
  4. additionethyl acetate was added to the residue
  5. washThe organic layer was washed successively with saturated aqueous sodium hydrogen carbonate and saturated brine
  6. dry with materialdried over anhydrous magnesium sulfate
  7. concentrationconcentrated

Sources & evidence

ORD record
ord-4e9d6c3b52374507b42cb6df39e35ff3
Source dataset
uspto-grants-2008_05
Patent number
US07368578B2

Reaction notes

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