Citric Acid → 1-ethoxycarbonyl-3-(6-O-ethoxycarbonyl-beta-D-glucopyranosyl-oxy)-4-[(4-ethylthiophenyl)methyl]-5-methylpyrazole

HRID 6660

Reaction equation

HRID 6660 reaction equation
[CH2:1]([S:3][C:4]1[CH:9]=[CH:8][C:7]([CH2:10][C:11]2[C:12]([O:17][C@@H:18]3[O:26][C@H:25]([CH2:27][OH:28])[C@@H:23]([OH:24])[C@H:21]([OH:22])[C@H:19]3[OH:20])=[N:13][NH:14][C:15]=2[CH3:16])=[CH:6][CH:5]=1)[CH3:2].Cl[C:30]([O:32][CH2:33][CH3:34])=[O:31].[C:35]([OH:47])(=[O:46])CC(CC(O)=O)(C(O)=O)O.[CH3:48][C:49]1C=C(C)C=C(C)N=1>>[CH2:33]([O:32][C:30]([N:14]1[C:15]([CH3:16])=[C:11]([CH2:10][C:7]2[CH:8]=[CH:9][C:4]([S:3][CH2:1][CH3:2])=[CH:5][CH:6]=2)[C:12]([O:17][C@@H:18]2[O:26][C@H:25]([CH2:27][O:28][C:35]([O:47][CH2:48][CH3:49])=[O:46])[C@@H:23]([OH:24])[C@H:21]([OH:22])[C@H:19]2[OH:20])=[N:13]1)=[O:31])[CH3:34]

Participants

5

Reactant 4

HCID 311Citric AcidHCID 79532,4,6-TrimethylpyridineHCID 10928Ethyl chloroformateHCID 673371464-[(4-ethylthiophenyl)methyl]-3-(beta-D-glucopyranosyloxy)-5-methyl-1H-pyrazole

Product 1

HCID 235431661-ethoxycarbonyl-3-(6-O-ethoxycarbonyl-beta-D-glucopyranosyl-oxy)-4-[(4-ethylthiophenyl)methyl]-5-methylpyrazole

Procedure

To a solution of 4-[(4-ethylthiophenyl)methyl]-3-(β-D-glucopyranosyloxy)-5-methyl-1H-pyrazole (0.03 g) in 2,4,6-trimethylpyridine (0.5 mL) was added ethyl chloroformate (0.021 mL), and the mixture was stirred at room temperature overnight. To the reaction mixture was added 10% aqueous citric acid solution, and the resulting mixture was extracted with ethylacetate. The organic layer was dried over anhydrous magnesium sulfate, and the solvent was removed under reduced pressure. The residue was purified by preparative thin layer chromatography on silica gel (eluent: dichloromethane/methanol=10/1) to give 1-ethoxycarbonyl-3-(6-O-ethoxycarbonyl-β-D-glucopyranosyloxy)-4-[(4-ethylthiophenyl)methyl]-5-methylpyrazole (0.023 g).

Workup

  1. extractionthe resulting mixture was extracted with ethylacetate
  2. dry with materialThe organic layer was dried over anhydrous magnesium sulfate
  3. customthe solvent was removed under reduced pressure
  4. customThe residue was purified by preparative thin layer chromatography on silica gel (eluent: dichloromethane/methanol=10/1)

Sources & evidence

ORD record
ord-ecce5c467964454bbe231535179e1e69
Source dataset
uspto-grants-2006_08
Patent number
US07084123B2

Linked notes

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