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Cesium carbonate → 2-Chloro-6-fluoro-3-methylimidazo[1,2-A]pyridine

HRID 705073
Notes
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Reaction equation

HRID 705073 reaction equation
[Cl:1][C:2]1[N:3]=[C:4]2[CH:9]=[CH:8][C:7]([F:10])=[CH:6][N:5]2[C:11]=1I.[CH3:13]B(O)O.C(=O)([O-])[O-].[Cs+].[Cs+].C1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1>O1CCCC1.C([O-])(=O)C.[Pd+2].C([O-])(=O)C>[Cl:1][C:2]1[N:3]=[C:4]2[CH:9]=[CH:8][C:7]([F:10])=[CH:6][N:5]2[C:11]=1[CH3:13]
ParticipantsConditionsProcedureWorkupSources & evidenceReaction notes

Participants

7

Reactant 4

HCID 10796Cesium carbonateHCID 11776TriphenylphosphineHCID 139377Methylboronic AcidHCID 717433442-Chloro-6-fluoro-3-iodoimidazo[1,2-A]pyridine

Product 1

HCID 717433452-Chloro-6-fluoro-3-methylimidazo[1,2-A]pyridine

Reagents, catalysts & solvents 2

HCID 167845
palladium(II) acetate
Catalyst
HCID 8028TetrahydrofuranSolvent

Conditions

Temperature
100 °C

Procedure

A mixture of the title compound from Example 3 Step A (0.500 g, 1.69 mmol), palladium acetate (0.038 g, 0.169 mmol), methyl boronic acid (0.202 g, 3.37 mmol), cesium carbonate (1.65 g, 5.06 mmol) and triphenyl phosphine (0.088 g, 0.337 mmol) in tetrahydrofuran (8.43 mL) was heated in a sealed tube at 100° C. for 18 hours. The mixture was then cooled to room temperature, filtered, and concentrated under reduced pressure. Purification by flash chromatography on silica gel (0-20% ethyl acetate in hexanes) provided the title compound: LCMS m/z 184.9 [M+H]+ 186.86 [M+2+H]+; 1H NMR (500 MHz, CDCl3) δ 7.75 (d, J=2.4 Hz, 1H), 7.51 (dd, J=9.7, 4.9 Hz, 1H), 7.14-7.102 (m, 1H), 2.44 (s, 3H).

Workup

  1. temperatureThe mixture was then cooled to room temperature
  2. filtrationfiltered
  3. concentrationconcentrated under reduced pressure
  4. customPurification by flash chromatography on silica gel (0-20% ethyl acetate in hexanes)

Sources & evidence

ORD record
ord-bc47f146f1a4447899c5ab126c127a0a
Source dataset
uspto-grants-2015_11
DOI
10.6084/m9.figshare.5104873.v1
Patent number
US09173873B2

Reaction notes

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On this pageParticipantsConditionsProcedureWorkupSources & evidenceReaction notes