Hydrochloric Acid → 3-Bromo-5-hydroxy-2-oxo-1-phenyl-1,2-dihydro-[1,7]naphthyridine-6-carboxylic acid methyl ester

HRID 1410878Notes

Reaction equation

HRID 1410878 reaction equation
C[O:2][C:3]([C:5]1[CH:10]=[C:9]([Br:11])[C:8](=[O:12])[N:7]([C:13]2[CH:18]=[CH:17][CH:16]=[CH:15][CH:14]=2)[C:6]=1[CH2:19][N:20]([CH2:31][C:32]([O:34][CH3:35])=[O:33])S(C1C=CC(C)=CC=1)(=O)=O)=O.C[O-].[Na+].Cl>CO.[Cl-].[Na+].O>[CH3:35][O:34][C:32]([C:31]1[C:3]([OH:2])=[C:5]2[C:6](=[CH:19][N:20]=1)[N:7]([C:13]1[CH:18]=[CH:17][CH:16]=[CH:15][CH:14]=1)[C:8](=[O:12])[C:9]([Br:11])=[CH:10]2)=[O:33]

Participants

6

Reactant 3

HCID 313Hydrochloric AcidHCID 10942334Sodium MethoxideHCID 867141395-Bromo-2-{[methoxycarbonylmethyl-(toluene-4-sulfonyl)-amino]-methyl}-6-oxo-1-phenyl-1,6-dihydro-pyridine-3-carboxylic acid methyl ester

Product 1

HCID 682971653-Bromo-5-hydroxy-2-oxo-1-phenyl-1,2-dihydro-[1,7]naphthyridine-6-carboxylic acid methyl esterYield 86.6%

Reagents, catalysts & solvents 2

HCID 887MethanolSolventHCID 57417360Sodium chloride; waterSolvent

Procedure

5-Bromo-2-{[methoxycarbonylmethyl-(toluene-4-sulfonyl)-amino]-methyl}-6-oxo-1-phenyl-1,6-dihydro-pyridine-3-carboxylic acid methyl ester (2.67 g, 4.74 mmol) was dissolved in 80 mL of MeOH and placed in ice bath. NaOMe solution (3.3 mL, 14.2 mmol, 4.375 M in MeOH) was added and the mixture was stirred for 16 h at r.t. 1 M HCl was added to acidify the mixture, followed by addition of 100 mL of brine. The resulting suspension was extracted with CH2Cl2. The organic layer was dried over MgSO4 and concentrated. The crude product was purified by silica gel chromatography (0-20% EtOAc/CH2Cl2) to give 1.54 g of the title compound as a light yellow solid. MS: (−) m/z 373.15, 375.16 (M−1, 79/81Br).

Workup

  1. extractionThe resulting suspension was extracted with CH2Cl2
  2. dry with materialThe organic layer was dried over MgSO4
  3. concentrationconcentrated
  4. customThe crude product was purified by silica gel chromatography (0-20% EtOAc/CH2Cl2)

Sources & evidence

ORD record
ord-db9913ac0a8e4f3ebadfab5c0999124d
Source dataset
uspto-grants-2014_12
Patent number
US08921389B2

Reaction notes

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