2-Fluoro-4-nitrophenol → Methyl 7-(2-fluoro-4-nitrophenoxy)thieno[3,2-b]pyridine-2-carboxylate

HRID 1261200Notes

Reaction equation

Cl[C:2]1[CH:7]=[CH:6][N:5]=[C:4]2[CH:8]=[C:9]([C:11]([O:13][CH3:14])=[O:12])[S:10][C:3]=12.[F:15][C:16]1[CH:21]=[C:20]([N+:22]([O-:24])=[O:23])[CH:19]=[CH:18][C:17]=1[OH:25].C([O-])([O-])=O.[K+].[K+]>O(C1C=CC=CC=1)C1C=CC=CC=1.CCOC(C)=O>[F:15][C:16]1[CH:21]=[C:20]([N+:22]([O-:24])=[O:23])[CH:19]=[CH:18][C:17]=1[O:25][C:2]1[CH:7]=[CH:6][N:5]=[C:4]2[CH:8]=[C:9]([C:11]([O:13][CH3:14])=[O:12])[S:10][C:3]=12

Participants

Conditions

Temperature: 180 °C

Procedure

A mixture of 37 (4.0 g, 17.6 mmol), 2-fluoro-4-nitrophenol (5.5 g, 35.0 mmol) and K2CO3 (12.1 g, 87.5 mmol) in Ph2O was heated at 180° C. for 5 hours. The mixture was cooled to room temperature, diluted with EtOAc and washed with water. The organic phase was collected, dried over anhydrous sodium sulfate and the solvents were removed under reduced pressure. The residue was purified by flash chromatography using hexane—AcOEt (70:30) as an eluent. The product from the column was re-crystallized from a mixture of ethyl acetate-hexanes to afford 38 (3.6 g, 59% yield) as a white solid. 1H NMR (400 MHz, DMSO-d6) δ(ppm): 8.69 (d, J=5.2 Hz, 1H), 8.47 (dd, J=2.4 and 10.0 Hz, 1H), 8.27 (s, 1H), 8.21 (m, 1H), 7.77 (dd, J=8.0 and 9.2 Hz, 1H), 7.06 (dd, J=0.8 and 5.2 Hz, 1H), 3.93 (s, 3H).

Workup

temperatureThe mixture was cooled to room temperature
washwashed with water
customThe organic phase was collected
dry with materialdried over anhydrous sodium sulfate
customthe solvents were removed under reduced pressure
customThe residue was purified by flash chromatography
customThe product from the column was re-crystallized from a mixture of ethyl acetate-hexanes

Sources & evidence

ORD record: ord-2cfe87d7bc674203bac13b232a9f0ac6
Source dataset: uspto-grants-2013_06
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08470850B2

Reaction notes

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