Water → Methyl 1-(2-fluoro-4-iodophenyl)-5-methoxy-4-oxo-1,4-dihydropyridazine-3-carboxylate

HRID 2089778Notes

Reaction equation

HRID 2089778 reaction equation
[F:1][C:2]1[CH:7]=[C:6]([I:8])[CH:5]=[CH:4][C:3]=1[NH:9][N:10]=[C:11]([C:16](=[O:20])[CH2:17][O:18][CH3:19])[C:12]([O:14][CH3:15])=[O:13].O.[CH3:22]OC(OC)N(C)C>>[F:1][C:2]1[CH:7]=[C:6]([I:8])[CH:5]=[CH:4][C:3]=1[N:9]1[CH:22]=[C:17]([O:18][CH3:19])[C:16](=[O:20])[C:11]([C:12]([O:14][CH3:15])=[O:13])=[N:10]1

Participants

4

Reactant 3

HCID 962WaterHCID 78373Dimethylformamide dimethyl acetalHCID 178496278HCID 178496278, compound

Product 1

HCID 59436140Methyl 1-(2-fluoro-4-iodophenyl)-5-methoxy-4-oxo-1,4-dihydropyridazine-3-carboxylateYield 59%

Procedure

A solution of methyl 2-[(2-fluoro-4-iodophenyl)hydrazono]-4-methoxy-3-oxobutanoate (6.27 g, 15.9 mmol) in N,N-dimethylformamide dimethyl acetal (60 mL) was refluxed for 3 h. After cooling to room temperature, the reaction mixture was poured into water and extracted with AcOEt. The extract was washed with water and brine, dried over MgSO4, and concentrated under reduced pressure. The residue was purified by silica gel column chromatography eluting with AcOEt and recrystallized from MeOH to give the title compound (3.77 g, 59% yield) as off-white crystals: mp 160-162° C.; 1H NMR (300 MHz, CDCl3): δ ppm 3.90 (3H, s), 3.97 (3H, s), 7.36-7.41 (1H, m), 7.64-7.70 (2H, m), 7.73 (1H, d, J=2.6 Hz). Anal. Calcd for C13H10FIN2O4: C, 38.64; H, 2.49; N, 6.93. Found: C, 38.68; H, 2.59; N, 6.98.

Workup

  1. extractionextracted with AcOEt
  2. washThe extract was washed with water and brine
  3. dry with materialdried over MgSO4
  4. concentrationconcentrated under reduced pressure
  5. customThe residue was purified by silica gel column chromatography
  6. washeluting with AcOEt
  7. customrecrystallized from MeOH

Sources & evidence

ORD record
ord-e67076c447fa48589d33fa5b56889543
Source dataset
uspto-grants-2013_05
Patent number
US08435995B2

Reaction notes

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