2-(3-Bromoimidazo[1,2-a]pyrimidin-7-yl)propan-2-ol → 2-[3-(2,4-Difluoro-3-(pyridin-3-yl)phenyl)imidazo[1,2-alpha]pyrimidin-7-yl]propan-2-ol

HRID 2183990Notes

Reaction equation

HRID 2183990 reaction equation
Br[C:2]1[N:6]2[CH:7]=[CH:8][C:9]([C:11]([OH:14])([CH3:13])[CH3:12])=[N:10][C:5]2=[N:4][CH:3]=1.[F:15][C:16]1[C:21]([C:22]2[CH:23]=[N:24][CH:25]=[CH:26][CH:27]=2)=[C:20]([F:28])[CH:19]=[CH:18][C:17]=1B(O)O>O1CCCC1.C(=O)([O-])[O-].[Na+].[Na+].O.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>[F:28][C:20]1[C:21]([C:22]2[CH:23]=[N:24][CH:25]=[CH:26][CH:27]=2)=[C:16]([F:15])[CH:17]=[CH:18][C:19]=1[C:2]1[N:6]2[CH:7]=[CH:8][C:9]([C:11]([OH:14])([CH3:13])[CH3:12])=[N:10][C:5]2=[N:4][CH:3]=1

Participants

7

Reactant 2

HCID 112422822-(3-Bromoimidazo[1,2-a]pyrimidin-7-yl)propan-2-olHCID 222400962,4-Difluoro-3-(pyridin-3-yl)benzeneboronic acid

Product 1

HCID 99691392-[3-(2,4-Difluoro-3-(pyridin-3-yl)phenyl)imidazo[1,2-alpha]pyrimidin-7-yl]propan-2-ol

Reagents, catalysts & solvents 4

HCID 178418397HCID 178418397, compoundCatalystHCID 962WaterSolventHCID 8028TetrahydrofuranSolventHCID 10340Sodium CarbonateSolvent

Conditions

Temperature
65 °C

Procedure

A mixture of 2-(3-bromoimidazo[1,2-α]pyrimidin-7-yl)propan-2-ol (256 mg, 1.0 mmol) and 2,4-difluoro-3-(pyridin-3-yl)benzeneboronic acid (352 mg, 1.5 mmol) in tetrahydrofuran (3 ml) and sodium carbonate (1.25 ml of a 2M solution in water, 2.5 mmol) was degassed with nitrogen for 10 min. Tetrakis(triphenylphosphine)palladium(0) (58 mg, 0.05 mmol) was added and this mixture was heated at 65° C. for 24 h. The reaction was cooled to ambient temperature then partitioned between dichloromethane and saturated aqueous sodium hydrogencarbonate. The organics were dried over anhydrous magnesium sulfate, filtered and pre-adsorbed onto silica. Purification by chromatography on silica gel eluting with dichloromethane (containing 1% conc. ammonia) on a gradient of methanol (1-5%) gave 2-[3-(2,4-difluoro-3-(pyridin-3-yl)phenyl)imidazo[1,2-α]pyrimidin-7-yl]propan-2-ol as a pale yellow oil which solidified on standing (200 mg, 44%). Bis-hydrochloride salt (from ethyl acetate/ethanol): δH (360 MHz, d6-DMSO) 1.56 (6H, s), 7.62 (1H, t, J 9), 7.79-7.84 (1H, m), 7.86 (1H, s), 7.88 (1H, s), 8.32 (1H, d, J 8), 8.54 (1H, s), 8.80 (1H, d, J 5), 8.98 (1H, s), 9.27 (1H, dd, J 7 and 3).

Workup

  1. customwas degassed with nitrogen for 10 min
  2. temperatureThe reaction was cooled to ambient temperature
  3. customthen partitioned between dichloromethane and saturated aqueous sodium hydrogencarbonate
  4. dry with materialThe organics were dried over anhydrous magnesium sulfate
  5. filtrationfiltered and pre-adsorbed onto silica
  6. customPurification by chromatography on silica gel eluting with dichloromethane (containing 1% conc. ammonia) on a gradient of methanol (1-5%)

Sources & evidence

ORD record
ord-f004cc3071fb4df5b5fb8dabddf8ea0e
Source dataset
uspto-grants-2005_05
Patent number
US06900215B2

Reaction notes

Loading…