Cesium carbonate → N-(4-(4-chloro-2-fluorophenyl)-5-formylpyridin-2-yl)acetamide

HRID 1398352Notes

Reaction equation

HRID 1398352 reaction equation
Cl[C:2]1[C:7]([CH:8]=[O:9])=[CH:6][N:5]=[C:4]([NH:10][C:11](=[O:13])[CH3:12])[CH:3]=1.[Cl:14][C:15]1[CH:20]=[CH:19][C:18](B(O)O)=[C:17]([F:24])[CH:16]=1.C(=O)([O-])[O-].[Cs+].[Cs+]>O.C1COCC1.C1C=CC([P]([Pd]([P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)([P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)[P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)=CC=1>[Cl:14][C:15]1[CH:20]=[CH:19][C:18]([C:2]2[C:7]([CH:8]=[O:9])=[CH:6][N:5]=[C:4]([NH:10][C:11](=[O:13])[CH3:12])[CH:3]=2)=[C:17]([F:24])[CH:16]=1

Participants

7

Reactant 3

HCID 10796Cesium carbonateHCID 4193595(4-Chloro-2-fluorophenyl)boronic acidHCID 86695931N-(4-chloro-5-formylpyridin-2-yl)acetamide

Product 1

HCID 86695932N-(4-(4-chloro-2-fluorophenyl)-5-formylpyridin-2-yl)acetamideYield 60%

Reagents, catalysts & solvents 3

HCID 178418397HCID 178418397, compoundCatalystHCID 962WaterSolvent2×HCID 8028TetrahydrofuranSolvent

Conditions

Temperature
85 °C

Procedure

To a stirred solution of N-(4-chloro-5-formylpyridin-2-yl)acetamide (3 g, 15.11 mmol), (4-chloro-2-fluorophenyl)boronic acid (2.63 g, 15.11 mmol), cesium carbonate (9.84 g, 30.2 mmol) in a mixture of water (8 mL) and THF (25 mL) was added tetrakis(triphenylphosphine)palladium (19.19 mg, 0.017 mmol) and the reaction was heated to 85° C. overnight (14 h). The reaction mixture was diluted with water (25 mL) and extracted with EtOAc (2×25 mL). The combined organic layers were washed with water (25 mL), brine (25 mL), dried over sodium sulfate, and concentrated under reduced pressure. The residue was purified by silica gel chromatography (hexane/EtOAc as eluant), yielding N-(4-(4-chloro-2-fluorophenyl)-5-formylpyridin-2-yl)acetamide as an off-white solid (2.8 g, 9.01 mmol, 60% yield). LC/MS (ESI) m/e 291.0 [(M)−, calcd for C14H9ClFN2O2 291.0], LC/MS retention time (method A): tR=1.69 min; 1H NMR (400 MHz, DMSO-d6) δ 11.14 (s, 1H), 9.84 (d, J=Hz, 1H), 8.88 (s, 1H), 8.13 (s, 1H), 7.61 (dd, J=2.00, 10.00 Hz, 1H), 7.46-7.48 (m, 2H), 2.11 (s, 3H).

Workup

  1. extractionextracted with EtOAc (2×25 mL)
  2. washThe combined organic layers were washed with water (25 mL), brine (25 mL)
  3. dry with materialdried over sodium sulfate
  4. concentrationconcentrated under reduced pressure
  5. customThe residue was purified by silica gel chromatography (hexane/EtOAc as eluant)

Sources & evidence

ORD record
ord-11c410e04ea8462cb8590a168f9dccaa
Source dataset
uspto-grants-2014_12
Patent number
US08901305B2

Reaction notes

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