Cesium carbonate → 2-((3-Chloro-5-fluoro-4-nitrophenoxy)methyl)-5-methylpyridine

HRID 1848704Notes

Reaction equation

[Cl:1][C:2]1[CH:3]=[C:4]([OH:12])[CH:5]=[C:6]([F:11])[C:7]=1[N+:8]([O-:10])=[O:9].C(=O)([O-])[O-].[Cs+].[Cs+].Cl.Cl[CH2:21][C:22]1[CH:27]=[CH:26][C:25]([CH3:28])=[CH:24][N:23]=1>CN(C=O)C>[Cl:1][C:2]1[CH:3]=[C:4]([CH:5]=[C:6]([F:11])[C:7]=1[N+:8]([O-:10])=[O:9])[O:12][CH2:21][C:22]1[CH:27]=[CH:26][C:25]([CH3:28])=[CH:24][N:23]=1

Participants

Conditions

Temperature: 75 °C

Procedure

To a mixture of 3-chloro-5-fluoro-4-nitrophenol (2.6 g, 13 mmol), cesium carbonate (8.7 g, 27 mmol), and 2-(chloromethyl)-5-methylpyridine hydrochloride (2.4 g, 13 mmol) was added DMF (88 mL) and the resulting mixture was heated to 75° Celsius for 19 h. The mixture was cooled to RT and then stirred for an additional 20 h. The resulting mixture was then partitioned between sat. NaHCO3 and EtOAc. The organic layer was separated and the aqueous layer was further extracted with EtOAc. The combined organic layers were washed with brine, dried and concentrated to dryness. The resulting residue was purified using FCC to afford the title compound (2.93 g, 74%). MS (ESI): mass calcd. for C13H10ClFN2O3, 296.04; m/z found, 297.1 [M+H]+. 1H NMR (400 MHz, CDCl3) δ 8.45 (dd, J=1.4, 0.7, 1H), 7.55 (dd, J=7.9, 1.6, 1H), 7.32 (d, J=7.9, 1H), 6.93 (dd, J=2.5, 1.8, 1H), 6.79 (dd, J=11.1, 2.6, 1H), 5.19 (s, 2H), 2.37 (s, 3H).

Workup

temperatureThe mixture was cooled to RT
customThe resulting mixture was then partitioned between sat. NaHCO3 and EtOAc
customThe organic layer was separated
extractionthe aqueous layer was further extracted with EtOAc
washThe combined organic layers were washed with brine
customdried
concentrationconcentrated to dryness
customThe resulting residue was purified

Sources & evidence

ORD record: ord-bc83488bd9c545aa9c60d23cc94f8fb1
Source dataset: uspto-grants-2015_02
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08952177B2

Reaction notes

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