4-Chloro-6-fluoro-1-(4-methoxy-benzyl)-2-oxo-1,2-dihydro-[1,8]-naphthyridine-3-carboxylic Acid Ethyl Ester → 4-Chloro-6-fluoro-2-oxo-1,2-dihydro-[1,8]-naphthyridine-3-carboxylic Acid Ethyl Ester

HRID 901257

Reaction equation

HRID 901257 reaction equation
[CH2:1]([O:3][C:4]([C:6]1[C:7](=[O:27])[N:8](CC2C=CC(OC)=CC=2)[C:9]2[C:14]([C:15]=1[Cl:16])=[CH:13][C:12]([F:17])=[CH:11][N:10]=2)=[O:5])[CH3:2]>C(O)(C(F)(F)F)=O>[CH2:1]([O:3][C:4]([C:6]1[C:7](=[O:27])[NH:8][C:9]2[C:14]([C:15]=1[Cl:16])=[CH:13][C:12]([F:17])=[CH:11][N:10]=2)=[O:5])[CH3:2]

Participants

3

Reactant 1

HCID 692183544-Chloro-6-fluoro-1-(4-methoxy-benzyl)-2-oxo-1,2-dihydro-[1,8]-naphthyridine-3-carboxylic Acid Ethyl Ester

Product 1

HCID 692189084-Chloro-6-fluoro-2-oxo-1,2-dihydro-[1,8]-naphthyridine-3-carboxylic Acid Ethyl EsterYield 98.7%

Reagents, catalysts & solvents 1

HCID 6422Trifluoroacetic acidSolvent

Procedure

A solution of 4-chloro-6-fluoro-1-(4-methoxy-benzyl)-2-oxo-1,2-dihydro-[1,8]-naphthyridine-3-carboxylic acid ethyl ester (76) (6.0 g, 15.35 mmol) in neat TFA was refluxed for 3 h. The solution was cooled and the excess TFA was distilled under vacuum. The residue was suspended in saturated NaHCO3 solution, sonicated briefly and filtered. The solids were washed by water, and dried at room temperature to yield 4.1 g (98%) of 4-chloro-6-fluoro-2-oxo-1,2-dihydro-[1,8]-naphthyridine-3-carboxylic acid ethyl ester (78) as white solids. MP: 217° C.; 1H-NM (DMSO-d6): 1.28 (t, J=7.2 Hz, 3H), 4.35 (q, J=7.2 Hz, 2H), 8.24 (dd, J=2.8, 8.0 Hz, 1H), 8.75 (d, J=2.8 Hz, 1H), 13.00 (s, 1H); EIMS: 271 (M+1).

Workup

  1. temperatureThe solution was cooled
  2. distillationthe excess TFA was distilled under vacuum
  3. customsonicated briefly
  4. filtrationfiltered
  5. washThe solids were washed by water
  6. customdried at room temperature

Sources & evidence

ORD record
ord-29564bd823e6442aa6cea2482aa468ea
Source dataset
uspto-grants-2008_04
Patent number
US07361760B2

Linked notes

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