Cesium carbonate → Methyl 3-[(4-fluorobenzyl)amino]pyridine-4-carboxylate

HRID 1847142Notes

Reaction equation

Br[C:2]1[CH:11]=[N:10][CH:9]=[CH:8][C:3]=1[C:4]([O:6][CH3:7])=[O:5].[F:12][C:13]1[CH:20]=[CH:19][C:16]([CH2:17][NH2:18])=[CH:15][CH:14]=1.CC1(C)C2C(=C(P(C3C=CC=CC=3)C3C=CC=CC=3)C=CC=2)OC2C(P(C3C=CC=CC=3)C3C=CC=CC=3)=CC=CC1=2.C(=O)([O-])[O-].[Cs+].[Cs+]>O1CCOCC1.C1C=CC(/C=C/C(/C=C/C2C=CC=CC=2)=O)=CC=1.C1C=CC(/C=C/C(/C=C/C2C=CC=CC=2)=O)=CC=1.[Pd]>[F:12][C:13]1[CH:20]=[CH:19][C:16]([CH2:17][NH:18][C:2]2[CH:11]=[N:10][CH:9]=[CH:8][C:3]=2[C:4]([O:6][CH3:7])=[O:5])=[CH:15][CH:14]=1

Participants

Conditions

Temperature: 116 °C

Procedure

Methyl 3-bromoisonicotinate (220 mg, 1.02 mmol), 4-fluorobenzylamine (132 μL, 1.22 mmol), tris(dibenzylideneacetone)dipalladium(O) (47 mg, 0.051 mmol), Xantphos (89 mg, 0.153 mmol), and cesium carbonate (500 mg, 1.53 mmol) were combined in dioxane (4 mL) under N2 in a sealed microwave tube. The reaction mixture was heated at 116° C. in a microwave for 1 h. The mixture was then filtered, washing with DCM, to remove solids. The solution was concentrated in vacuo and purified by silica gel chromatography (20-50% EtOAc/hexanes) to give 228 mg (88%) of the title compound as a white solid. 1H NMR (400 MHz, CDCl3): δ 8.18 (s, 1H), 7.93 (d, 1H, J=5.0 Hz), 7.79 (br s, 1H), 7.63 (d, 1H, J=5.0 Hz), 7.27-7.34 (m, 2H), 7.03 (t, 2H, J=8.6 Hz), 4.47 (d, 2H, J=5.6 Hz), 3.89 (s, 3H). [M+H] calc'd for C14H13FN2O2, 261. Found 261.

Workup

filtrationThe mixture was then filtered
washwashing with DCM
customto remove solids
concentrationThe solution was concentrated in vacuo
custompurified by silica gel chromatography (20-50% EtOAc/hexanes)

Sources & evidence

ORD record: ord-884cc055a21f45bda0fef01dde0ad0e9
Source dataset: uspto-grants-2015_02
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08952151B2

Reaction notes

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