Toluene → 2-(((3-methyl-4-((8-methyl-1,4,7,9-tetraoxaspiro[4.5]dec-8-yl)methoxy)pyridin-2-yl)methyl)sulfinyl)-1H-benzimidazole

HRID 31591Notes

Reaction equation

HRID 31591 reaction equation
C1(C)C=CC=CC=1.[CH3:8][C:9]1[C:10]([CH2:28][S:29][C:30]2[NH:34][C:33]3[CH:35]=[CH:36][CH:37]=[CH:38][C:32]=3[N:31]=2)=[N:11][CH:12]=[CH:13][C:14]=1[O:15][CH2:16][C:17]1([CH3:27])[O:26][CH2:25][C:20]2([O:24][CH2:23][CH2:22][O:21]2)[CH2:19][O:18]1.ClC1C=CC=C(C(OO)=[O:47])C=1>CO>[CH3:8][C:9]1[C:10]([CH2:28][S:29]([C:30]2[NH:31][C:32]3[CH:38]=[CH:37][CH:36]=[CH:35][C:33]=3[N:34]=2)=[O:47])=[N:11][CH:12]=[CH:13][C:14]=1[O:15][CH2:16][C:17]1([CH3:27])[O:18][CH2:19][C:20]2([O:21][CH2:22][CH2:23][O:24]2)[CH2:25][O:26]1

Participants

5

Reactant 3

HCID 1140Toluene2×HCID 70297m-Chloroperbenzoic acidHCID 597925332-(((3-methyl-4-((8-methyl-1,4,7,9-tetraoxaspiro[4.5]dec-8-yl)methoxy)pyridin-2-yl)methyl)thio)-1H-benzimidazole

Product 1

HCID 120031192-(((3-methyl-4-((8-methyl-1,4,7,9-tetraoxaspiro[4.5]dec-8-yl)methoxy)pyridin-2-yl)methyl)sulfinyl)-1H-benzimidazoleYield 38.4%

Reagents, catalysts & solvents 1

HCID 887MethanolSolvent2×

Procedure

To a toluene (8.1 ml) and methanol (0.9 ml) solution of the 2-(((3-methyl-4-((8-methyl-1,4,7,9-tetraoxaspiro[4.5]dec-8-yl)methoxy)pyridin-2-yl)methyl)thio)-1H-benzimidazole (372 mg, 0.84 mmol) obtained in the step (5f), a toluene (2.7 ml) and methanol (0.3 ml) solution of 3-chloroperbenzoic acid (200 mg, 0.76 mmol as the content was regarded as 65%) was added dropwise at −55° C. to −50° C. for 10 minutes in a nitrogen atmosphere. The mixture was stirred at −60° C. to −50° C. for 1.5 hours. The reaction was terminated by adding 12 ml of a saturated aqueous solution of sodium hydrogen carbonate at the same temperature. The mixture was extracted with 50 ml of chloroform twice, and then, the organic layer was dried over anhydrous sodium sulfate and concentrated. The obtained crude product was purified by silica gel column chromatography (NH silica gel, elution solvent: ethyl acetate/methanol=1/0-4/1 gradient) and desired fractions were concentrated. The obtained white foam was re-precipitated with chloroform and diethyl ether and filtered. The operation was repeated twice to obtain the title compound (148 mg, 38.4% yield) as a white solid.

Workup

  1. additionwas added dropwise at −55° C. to −50° C. for 10 minutes in a nitrogen atmosphere
  2. customThe reaction was terminated
  3. additionby adding 12 ml of a saturated aqueous solution of sodium hydrogen carbonate at the same temperature
  4. extractionThe mixture was extracted with 50 ml of chloroform twice
  5. dry with materialthe organic layer was dried over anhydrous sodium sulfate
  6. concentrationconcentrated
  7. customThe obtained crude product
  8. customwas purified by silica gel column chromatography (NH silica gel, elution solvent: ethyl acetate/methanol=1/0-4/1 gradient)
  9. concentrationdesired fractions were concentrated
  10. customThe obtained white foam was re-precipitated with chloroform and diethyl ether
  11. filtrationfiltered

Sources & evidence

ORD record
ord-c127fee4ad9e44e5947c45fbf65f39b4
Source dataset
uspto-grants-2008_09
Patent number
US07425634B2

Reaction notes

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