Water → 6-Fluoro-3-(3-fluoro-4-pyridinylamino)benzo[b]thiophene

HRID 376876Notes

Reaction equation

HRID 376876 reaction equation
[NH2:1][C:2]1[C:3]2[CH:10]=[CH:9][C:8]([F:11])=[CH:7][C:4]=2[S:5][CH:6]=1.Cl.Cl[C:14]1[CH:19]=[CH:18][N:17]=[CH:16][C:15]=1[F:20].O>CN1CCCC1=O>[F:11][C:8]1[CH:9]=[CH:10][C:3]2[C:2]([NH:1][C:14]3[CH:19]=[CH:18][N:17]=[CH:16][C:15]=3[F:20])=[CH:6][S:5][C:4]=2[CH:7]=1

Participants

5

Reactant 3

HCID 962WaterHCID 107971626-Fluorobenzo[b]thiophen-3-amineHCID 193602344-Chloro-3-fluoropyridine hydrochloride

Product 1

HCID 193601686-Fluoro-3-(3-fluoro-4-pyridinylamino)benzo[b]thiopheneYield 82.6%

Reagents, catalysts & solvents 1

HCID 13387N-methyl-2-pyrrolidoneSolvent

Procedure

A solution of 3-amino-6-fluorobenzo[b]thiophene (10 g, 60 mmol) and 4-chloro-3-fluoropyridine hydrochloride (12 g, 71 mmol) in 150 mL of 1-methyl-2-pyrrolidinone was stirred at 90-95° for 2.5 h, and thereafter cooled, stirred with water and extracted with ether. The aqueous layer was basified with 30% aqueous ammonium hydroxide and extracted with ether. The organic extract was washed with water and saturated sodium chloride solution, and dried (anhydrous magnesium sulfate), filtered and concentrated to give 13 g of a solid. Elution through silica with 10% ethyl acetate in dichloromethane via flash column chromatography yielded 7 g (44.6%) of a white solid, mp 155-157° C. Recrystallization of 2 g from acetonitrile afforded 1.3 g (29%) of white needles, mp 158-159° C.

Workup

  1. temperaturecooled
  2. extractionextracted with ether
  3. extractionextracted with ether
  4. extractionThe organic extract
  5. washwas washed with water and saturated sodium chloride solution
  6. dry with materialdried (anhydrous magnesium sulfate)
  7. filtrationfiltered
  8. concentrationconcentrated

Sources & evidence

ORD record
ord-c3eb8ab11ada4254a7df3fdb70623f4e
Source dataset
uspto-grants-2000_02
Patent number
US06022880

Reaction notes

Loading…