Hydrochloric Acid → 1,3-Dibenzyl-5-hydroxy-8-methyl-2-oxo-1,2-dihydro-[1,7]naphthyridine-6-carboxylic acid methyl ester

HRID 1410702Notes

Reaction equation

HRID 1410702 reaction equation
[CH3:1][O:2][C:3]([C:5]1[C:6]([OH:31])=[C:7]2[C:12](=[C:13](Br)[N:14]=1)[N:11]([CH2:16][C:17]1[CH:22]=[CH:21][CH:20]=[CH:19][CH:18]=1)[C:10](=[O:23])[C:9]([CH2:24][C:25]1[CH:30]=[CH:29][CH:28]=[CH:27][CH:26]=1)=[CH:8]2)=[O:4].[CH3:32][Sn](C)(C)C.CCOC(C)=O.Cl>CN(C=O)C.[Cl-].[Na+].O.Cl[Pd](Cl)([P](C1C=CC=CC=1)(C1C=CC=CC=1)C1C=CC=CC=1)[P](C1C=CC=CC=1)(C1C=CC=CC=1)C1C=CC=CC=1>[CH3:1][O:2][C:3]([C:5]1[C:6]([OH:31])=[C:7]2[C:12](=[C:13]([CH3:32])[N:14]=1)[N:11]([CH2:16][C:17]1[CH:22]=[CH:21][CH:20]=[CH:19][CH:18]=1)[C:10](=[O:23])[C:9]([CH2:24][C:25]1[CH:30]=[CH:29][CH:28]=[CH:27][CH:26]=1)=[CH:8]2)=[O:4]

Participants

8

Reactant 4

HCID 313Hydrochloric AcidHCID 8857Ethyl AcetateHCID 11661TetramethyltinHCID 867141071,3-Dibenzyl-8-bromo-5-hydroxy-2-oxo-1,2-dihydro-[1,7]naphthyridine-6-carboxylic acid methyl ester

Product 1

HCID 682972741,3-Dibenzyl-5-hydroxy-8-methyl-2-oxo-1,2-dihydro-[1,7]naphthyridine-6-carboxylic acid methyl esterYield 62.3%

Reagents, catalysts & solvents 3

HCID 178418476HCID 178418476, compoundCatalystHCID 6228DimethylformamideSolventHCID 57417360Sodium chloride; waterSolvent

Conditions

Temperature
120 °C

Procedure

A mixture of 1,3-dibenzyl-8-bromo-5-hydroxy-2-oxo-1,2-dihydro-[1,7]naphthyridine-6-carboxylic acid methyl ester (150 mg, 0.31 mmol), tetramethyltin (0.22 mL, 1.57 mmol) and PdCl2(PPh3)2 (44 mg, 0.063 mmol) in 5 mL of DMF was heated at 120° C. for 2 h under nitrogen atmosphere. After the mixture was cooled to r.t., EtOAc (50 mL) and brine (10 mL) were added. 1M HCl was added with stirring until pH was about 2. The aqueous layer was extracted with additional EtOAc, and the combined organic layer was washed with water and dried over MgSO4. After evaporating the solvent in vacuo, the crude product was chromatographed (0-40% EtOAc/hexanes+2% AcOH) to give 80 mg of the title compound. MS: (+) m/z 415.12 (M+1).

Workup

  1. temperatureAfter the mixture was cooled to r.t.
  2. extractionThe aqueous layer was extracted with additional EtOAc
  3. washthe combined organic layer was washed with water
  4. dry with materialdried over MgSO4
  5. customAfter evaporating the solvent in vacuo
  6. customthe crude product was chromatographed (0-40% EtOAc/hexanes+2% AcOH)

Sources & evidence

ORD record
ord-96712cc640414be7bf313818b0bddd7b
Source dataset
uspto-grants-2014_12
Patent number
US08921389B2

Reaction notes

Loading…