Benzenesulfonic acid, 4-methyl-, compd. with pyridine (1:1) → HCID 178493837, compound

HRID 2233783Notes

Reaction equation

HRID 2233783 reaction equation
[NH:1]1[C:5]2[CH:6]=[CH:7][CH:8]=[CH:9][C:4]=2[NH:3][C:2]1=[C:10]([C:23]([C:25]1[CH:30]=[CH:29][CH:28]=[C:27]([F:31])[CH:26]=1)=[O:24])[C:11]([C:13]1[CH:18]=[CH:17][CH:16]=[C:15]([CH:19]([OH:22])[CH2:20][OH:21])[CH:14]=1)=[O:12].[C:32]([O-])([O-])([O:34][CH3:35])[CH3:33].C1(C)C=CC(S([O-])(=O)=O)=CC=1.[NH+]1C=CC=CC=1>C1COCC1>[NH:1]1[C:5]2[CH:6]=[CH:7][CH:8]=[CH:9][C:4]=2[NH:3][C:2]1=[C:10]([C:11]([C:13]1[CH:18]=[CH:17][CH:16]=[C:15]([CH:19]2[CH2:20][O:21][C:32]([O:34][CH3:35])([CH3:33])[O:22]2)[CH:14]=1)=[O:12])[C:23]([C:25]1[CH:30]=[CH:29][CH:28]=[C:27]([F:31])[CH:26]=1)=[O:24]

Participants

5

Reactant 3

HCID 466102Benzenesulfonic acid, 4-methyl-, compd. with pyridine (1:1)HCID 536300401-Methoxyethane-1,1-diolateHCID 178520867HCID 178520867, compound

Product 1

HCID 178493837HCID 178493837, compoundYield 68%

Reagents, catalysts & solvents 1

HCID 8028TetrahydrofuranSolvent

Procedure

A 6 ml portion of THF solution containing 0.21 g of 2-(1,3-dihydro-2H-benzimidazol-2-ylidene)-1-[3-(1,2-dihydroxyethyl)phenyl]-3-(3-fluorophenyl)propane-1,3-dione and 0.3 g of methyl orthoacetate was mixed with 63 mg of pyridinium p-toluenesulfonate and then stirred at room temperature for about 30 minutes. After evaporation of the solvent, the residue was mixed with an appropriate amount of sodium bicarbonate aqueous solution, extracted several times with ethyl acetate, dried with anhydrous magnesium sulfate and concentrated. The thus formed residue was purified by a silica gel column chromatography to obtain 162 mg (68%) of 2-(1,3-dihydro-2H-benzimidazol-2-ylidene)-1-(3-fluorophenyl)-3-[3-(2-methoxy-2-methyl-1,3-dioxolan-4-yl)phenyl]propane-1,3-dione (Example 3-1) as a pale yellow foam from an ethyl acetate-hexane (1:2) eluate.

Workup

  1. customAfter evaporation of the solvent
  2. additionthe residue was mixed with an appropriate amount of sodium bicarbonate aqueous solution
  3. extractionextracted several times with ethyl acetate
  4. dry with materialdried with anhydrous magnesium sulfate
  5. concentrationconcentrated
  6. customThe thus formed residue was purified by a silica gel column chromatography

Sources & evidence

ORD record
ord-231ea32e2b0842759dd126196d747b53
Source dataset
uspto-grants-2010_05
Patent number
US07709519B2

Reaction notes

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