Potassium Carbonate → Ethyl 6-bromo-1-(1-methylazetidin-3-yl)-4-oxo-1,4-dihydro-1,7-naphthyridine-3-carboxylate

HRID 1047174Notes

Reaction equation

[Br:1][C:2]1[CH:3]=[C:4]([C:17](F)=[CH:18][N:19]=1)[C:5]([C:7](=[CH:13][N:14]([CH3:16])C)[C:8]([O:10][CH2:11][CH3:12])=[O:9])=[O:6].Cl.[CH3:22][N:23]1[CH2:26]C(N)[CH2:24]1.C(=O)([O-])[O-].[K+].[K+]>C1COCC1>[Br:1][C:2]1[CH:3]=[C:4]2[C:17](=[CH:18][N:19]=1)[N:14]([CH:16]1[CH2:24][N:23]([CH3:26])[CH2:22]1)[CH:13]=[C:7]([C:8]([O:10][CH2:11][CH3:12])=[O:9])[C:5]2=[O:6]

Participants

Conditions

Temperature: 60 °C

Procedure

To a solution of ethyl 2-(2-bromo-5-fluoroisonicotinoyl)-3-(dimethylamino)acrylate (Intermediate 66, 0.690 g, 2 mmol, 1 equiv.) in THF (7 mL) was added 1-methylazetidin-3-amine HCl (245 mg, 2 mmol, 1 equiv.) and potassium carbonate (276 mg, 2 mmol, 1 equiv.). This reaction mixture was stirred at 60° C. for 1 h. The reaction mixture was concentrated under reduced pressure and re-suspended in DMF (7 mL). Potassium carbonate (553 mg, 4 mmol, 2 equiv.) was added, and the reaction mixture was stirred at 70° C. for 3 h. The reaction mixture was cooled to room temperature and quenched with water. 1 N HCl was added until pH 4-5 was reached. The precipitate was washed with water and hexanes and dried to provide ethyl 6-bromo-1-(1-methylazetidin-3-yl)-4-oxo-1,4-dihydro-1,7-naphthyridine-3-carboxylate (1.2 g, ≧99%). Calcd for C15H16BrN3O3 [M+H]+: 367.91.

Workup

concentrationThe reaction mixture was concentrated under reduced pressure
stirringthe reaction mixture was stirred at 70° C. for 3 h
temperatureThe reaction mixture was cooled to room temperature
customquenched with water
addition1 N HCl was added until pH 4-5
washThe precipitate was washed with water and hexanes
customdried

Sources & evidence

ORD record: ord-77e0c54e6aeb4b21ab23b83f019c250c
Source dataset: uspto-grants-2013_10
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08569484B2

Reaction notes

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