Dimethylformamide → 1-Benzyl-2-oxo-1,2-dihydro-1,8-naphthyridine-3-carboxylic acid chloride

HRID 2194491Notes

Reaction equation

[CH2:1]([N:8]1[C:17]2[C:12](=[CH:13][CH:14]=[CH:15][N:16]=2)[CH:11]=[C:10]([C:18](O)=[O:19])[C:9]1=[O:21])[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.C(Cl)(=O)C([Cl:25])=O.CN(C)C=O>ClCCl>[CH2:1]([N:8]1[C:17]2[C:12](=[CH:13][CH:14]=[CH:15][N:16]=2)[CH:11]=[C:10]([C:18]([Cl:25])=[O:19])[C:9]1=[O:21])[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1

Participants

Conditions

Temperature: 40 °C

Procedure

1.61 g (5.7 mmol) of 1-benzyl-2-oxo-1,2-dihydro-1,8-naphthyridine-3-carboxylic acid was dissolved in dichloromethane (60 mL), and 3.5 mL (42 mmol) of oxalyl chloride was added thereto. One droplet of N,N-dimethylformamide was added to the above mixture, and the resulting mixture was stirred for one hour at 40° C. The reaction solution was concentrated under reduced pressure, and thus 1-benzyl-2-oxo-1,2-dihydro-1,8-naphthyridine-3-carboxylic acid chloride was obtained. The acid chloride thus obtained was dissolved in dichloromethane (60 mL), and 0.71 g (6.3 mmol) of 1,3-cyclohexanedione and 0.97 mL (6.9 mmol) of triethylamine were added to the above solution. The resulting mixture was stirred for 2 hours at room temperature. The reaction mixture was poured into an aqueous solution of sodium hydrogen carbonate, and the mixture was extracted with dichloromethane. The organic phase was dried and concentrated. The residue was washed with diisopropyl ether, and thus 2.13 g of the title compound was obtained as a light yellow solid (yield: quantitative).

Workup

concentrationThe reaction solution was concentrated under reduced pressure

Sources & evidence

ORD record: ord-ad7e364db4ad4d329bff2707a0e9e601
Source dataset: uspto-grants-2012_12
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08334236B2

Reaction notes

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