Phosphorus oxychloride → N-(5-bromo-2-pyridinyl)-(2-nitro)-5fluorophenylcarboxamide

HRID 1760651Notes

Reaction equation

HRID 1760651 reaction equation
[F:1][C:2]1[CH:3]=[CH:4][C:5]([N+:11]([O-:13])=[O:12])=[C:6]([CH:10]=1)[C:7]([OH:9])=O.[NH2:14][C:15]1[CH:20]=[CH:19][C:18]([Br:21])=[CH:17][N:16]=1.P(Cl)(Cl)(Cl)=O>N1C=CC=CC=1>[Br:21][C:18]1[CH:19]=[CH:20][C:15]([NH:14][C:7]([C:6]2[CH:10]=[C:2]([F:1])[CH:3]=[CH:4][C:5]=2[N+:11]([O-:13])=[O:12])=[O:9])=[N:16][CH:17]=1

Participants

5

Reactant 3

HCID 24813Phosphorus oxychlorideHCID 706222-Amino-5-bromopyridineHCID 27374205-Fluoro-2-nitrobenzoic acid

Product 1

HCID 22596298N-(5-bromo-2-pyridinyl)-(2-nitro)-5fluorophenylcarboxamideYield 68.1%

Reagents, catalysts & solvents 1

HCID 1049PyridineSolvent

Procedure

A solution of 5-fluoro-2-nitrobenzoic acid (10.0 g, 54 mmol, 1.0 equiv), 2-amino-5-bromopyridine (12.2 g, 1.3 equiv), in 80 mL of pyridine was treated with phosphorous oxychloride (25.3 g, 3.0 equiv) for 30 min. The volatile was evaporated and the residue was redissolved into EtOAc, washed with 1N HCl, saturated aqueous NaHCO3 and saturated aqueous NaCl. The organic layer was dried over Na2SO4, filtered, and evaporated. The volatile was evaporated, and the product was triturated with diethyl ether to give N-(5-bromo-2-pyridinyl)-(2-nitro)-5-fluorophenylcarboxamide (12.5 g, 68%). MS found for C12H7BrFN3O3 (M+H)+: 340, 342. Step 2: A solution of N-(5-bromo-2-pyridinyl)-(2-nitro)-5-flurophenylcarboxamide (2.0 g, 5.88 mmol, 1.0 equiv) in 30 mL of EtOAc was treated with SnCl2H2O (5.90 g, 4 equiv) at reflux for 4 h. The volatile was evaporated and the residue was redissolved in EtOAc, washed with saturated aqueous NaHCO3 and 1N NaOH. The organic layer was dried over MgSO4, filtered and evaporated to N-(5-bromo-2-pyridinyl)-(2-amino)-5-fluorophenylcarboxamide (1.79 g, 98%). MS found for C12H9BrFN3O (M+H)+: 310, 312. Step 3: A mixture of N-(5-bromo-2-pyridinyl)-(2-amino)-5-fluorophenylcarboxamide (0.310 g, 1 mmol, 1.0 equiv), 4-[(2-t-butylaminosulfonyl)phenyl]benzoyl chloride (0.430 g, 1.3 equiv), pyridine (2 mL) in 10 mL of dichloromethane was stirred at rt overnight. The volatile was evaporated and the residue was redissolved into EtOAc, washed with 1N HCl, saturated aqueous NaHCO3 and saturated aqueous NaCl. The organic layer was dried over Na2SO4, filtered, and evaporated. The intermediate was reacted into 5 mL of trifluoroacetic acid at rt overnight. TFA was then evaporated and the product was triturated with diethyl ether, and then with chloroform to give N-(5-bromo-2-pyridinyl)-(2-4-[(2-aminosulfonyl)phenyl]phenylcarbonylamino)-5-fluorophenylcarboxamide (120 mg, 21%). MS found for C25H18BrFN4O4S (M+H)+: 569, 571.

Workup

  1. customThe volatile was evaporated
  2. dissolutionthe residue was redissolved into EtOAc
  3. washwashed with 1N HCl, saturated aqueous NaHCO3 and saturated aqueous NaCl
  4. dry with materialThe organic layer was dried over Na2SO4
  5. filtrationfiltered
  6. customevaporated
  7. customThe volatile was evaporated
  8. customthe product was triturated with diethyl ether

Sources & evidence

ORD record
ord-2f56e71f4f2b41c3a61f94891bab2611
Source dataset
uspto-grants-2005_01
Patent number
US06844367B1

Reaction notes

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