1,4-Dioxane → HCID 178506265, compound

HRID 1468092Notes

Reaction equation

HRID 1468092 reaction equation
[Cl:1][C:2]1[C:14](I)=[CH:13][C:5]2[NH:6][C:7]([C:9]([F:12])([F:11])[F:10])=[N:8][C:4]=2[CH:3]=1.[Cl:16][C:17]1[CH:18]=[C:19](B(O)O)[CH:20]=[C:21]([Cl:23])[CH:22]=1.O1CCOCC1.[Na+].C(O[O-])=O.[Na+].C(O[O-])=O>C1C=CC([P]([Pd]([P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)([P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)[P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)=CC=1.O>[Cl:1][C:2]1[C:14]([C:19]2[CH:18]=[C:17]([Cl:16])[CH:22]=[C:21]([Cl:23])[CH:20]=2)=[CH:13][C:5]2[NH:6][C:7]([C:9]([F:12])([F:11])[F:10])=[N:8][C:4]=2[CH:3]=1

Participants

7

Reactant 4

HCID 312751,4-DioxaneHCID 27343313,5-Dichlorophenylboronic acidHCID 86699529HCID 86699529, compoundHCID 178506268HCID 178506268, compound

Product 1

HCID 178506265HCID 178506265, compound

Reagents, catalysts & solvents 2

HCID 178418397HCID 178418397, compoundCatalystHCID 962WaterSolvent

Conditions

Temperature
100 °C

Procedure

Compound number 247 (i.e., 6-chloro-5-(3,5-dichlorophenyl)-2-trifluoromethylbenzimidazole) was prepared as follows. A 100-mL round-bottom flask was purged and maintained with an inert atmosphere of nitrogen. 5-chloro-6-iodo-2-(trifluoromethyl)-1H-1,3-benzodiazole (200 mg, 0.58 mmol, 1.00 equiv), (3,5-dichlorophenyl)boronic acid (110 mg, 0.58 mmol, 2.00 equiv), dioxane (15 mL), Pd(PPh3)4 (66.8 mg, 0.06 mmol, 0.10 equiv), water (5 mL) and sodium methaneperoxoate sodium (183.8 mg, 1.72 mmol, 3.00 equiv) was placed in the flask. The resulting solution was stirred overnight at 100° C. in an oil bath. The reaction was then quenched by the addition of 15 mL of water. The resulting solution was extracted with 3×20 mL of ethyl acetate and the organic layers combined and dried over anhydrous sodium sulfate and concentrated under vacuum. The residue was applied onto a silica gel column with ethyl acetate/petroleum ether (1:10). The crude product (100 mg) was purified by Flash-Prep-HPLC with the following conditions (IntelFlash-2): Column, C18 silica gel; mobile phase, water increasing to acetonitrile within 40 min; Detector, UV 254 nm. 47.7 mg product was obtained. This resulted in 47.7 mg (23%) of 6-chloro-5-(3,5-dichlorophenyl)-2-trifluoromethylbenzimidazole as a white solid.

Workup

  1. customA 100-mL round-bottom flask was purged
  2. temperaturemaintained with an inert atmosphere of nitrogen
  3. customThe reaction was then quenched by the addition of 15 mL of water
  4. extractionThe resulting solution was extracted with 3×20 mL of ethyl acetate
  5. dry with materialdried over anhydrous sodium sulfate
  6. concentrationconcentrated under vacuum
  7. customThe crude product (100 mg) was purified by Flash-Prep-HPLC with the following conditions (IntelFlash-2)
  8. waitmobile phase, water increasing to acetonitrile within 40 min

Sources & evidence

ORD record
ord-ccf3d523c3884e7796aa047c1ae48e33
Source dataset
uspto-grants-2015_04
Patent number
US09000187B2

Reaction notes

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