Cesium carbonate → 3-Fluoro-4-(4-methyl-3-pyridinyl)pyridine-2-carbonitrile

HRID 871149Notes

Reaction equation

[F:1][C:2]1[C:3]([C:9]#[N:10])=[N:4][CH:5]=[CH:6][C:7]=1I.[CH3:11][C:12]1[CH:17]=[CH:16][N:15]=[CH:14][C:13]=1B(O)O.C(=O)([O-])[O-].[Cs+].[Cs+]>O1CCOCC1.O.C(Cl)Cl>[F:1][C:2]1[C:3]([C:9]#[N:10])=[N:4][CH:5]=[CH:6][C:7]=1[C:13]1[CH:14]=[N:15][CH:16]=[CH:17][C:12]=1[CH3:11]

Participants

Conditions

Temperature: 85 °C

Procedure

A vial containing a mixture of 3-fluoro-4-iodopicolinonitrile (0.150 g, 0.605 mmol), 4-methylpyridin-3-ylboronic acid (0.174 g, 1.270 mmol), and cesium carbonate (0.414 g, 1.270 mmol) in dioxane (Ratio: 2.0, Volume: 1.222 ml) and water (Ratio: 1.000, Volume: 0.611 ml) was degassed with N2 for 5 min, then PdCl2(dppf)-CH2Cl2Adduct (0.026 g, 0.032 mmol) was added. The solution was heated at 85° C. for 14 hr, then allowed to cool to room temperature. The crude material was dissolved in a minimal amount of CH2Cl2 to be chromatographed. Purification of the crude material by silica gel chromatography using an ISCO machine (40 g column, 40 mL/min, 70-100% EtOAc in hexanes over 19 min, tr=14 min) gave the title compound (24 mg, 0.111 mmol, 18.42% yield) as a purple residue. ESI MS (M+H)+=214.1.

Workup

additionA vial containing
customwas degassed with N2 for 5 min
temperatureto cool to room temperature
customto be chromatographed
customPurification of the crude material by silica gel chromatography
customan ISCO machine (40 g column, 40 mL/min, 70-100% EtOAc in hexanes over 19 min, tr=14 min)

Sources & evidence

ORD record: ord-d0fb6cbfebed4f96b0c2c957e105129d
Source dataset: uspto-grants-2015_03
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08969586B2

Reaction notes

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