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Boron tribromide → (2S)-2-(3-{5-[(4R)-4-Ethyl-4,5-dihydro-1,3-oxazol-2-yl]-1H-pyrrol-2-yl}-5-{[6-(methylsulfonyl)pyridin-3-yl]oxy}phenoxy)propan-1-ol

HRID 909575
Notes
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Reaction equation

HRID 909575 reaction equation
[CH2:1]([C@@H:3]1[CH2:7][O:6][C:5]([C:8]2[NH:12][C:11]([C:13]3[CH:14]=[C:15]([CH:27]=[C:28]([O:30][C@@H:31]([CH3:35])[CH2:32][O:33]C)[CH:29]=3)[O:16][C:17]3[CH:18]=[CH:19][C:20]([S:23]([CH3:26])(=[O:25])=[O:24])=[N:21][CH:22]=3)=[CH:10][CH:9]=2)=[N:4]1)[CH3:2].B(Br)(Br)Br.C(=O)([O-])O.[Na+]>C(Cl)Cl>[CH2:1]([C@@H:3]1[CH2:7][O:6][C:5]([C:8]2[NH:12][C:11]([C:13]3[CH:29]=[C:28]([CH:27]=[C:15]([O:16][C:17]4[CH:22]=[N:21][C:20]([S:23]([CH3:26])(=[O:24])=[O:25])=[CH:19][CH:18]=4)[CH:14]=3)[O:30][C@@H:31]([CH3:35])[CH2:32][OH:33])=[CH:10][CH:9]=2)=[N:4]1)[CH3:2]
ParticipantsConditionsProcedureWorkupSources & evidenceReaction notes

Participants

5

Reactant 3

HCID 25134Boron tribromideHCID 516892Sodium BicarbonateHCID 666817565-(3-{5-[(4R)-4-Ethyl-4,5-dihydro-1,3-oxazol-2-yl]-1H-pyrrol-2-yl}-5-[(1S)-2-methoxy-1-methylethoxy]phenoxy)-2-(methylsulfonyl)pyridine

Product 1

HCID 44184020(2S)-2-(3-{5-[(4R)-4-Ethyl-4,5-dihydro-1,3-oxazol-2-yl]-1H-pyrrol-2-yl}-5-{[6-(methylsulfonyl)pyridin-3-yl]oxy}phenoxy)propan-1-olYield 71.7%

Reagents, catalysts & solvents

1
HCID 6344DichloromethaneSolvent

Conditions

Temperature
-78 °C

Procedure

5-(3-{5-[(4R)-4-Ethyl-4,5-dihydro-1,3-oxazol-2-yl]-1H-pyrrol-2-yl}-5-[(1S)-2-methoxy-1-methylethoxy]phenoxy)-2-(methylsulfonyl)pyridine (1.06 g, 2.12 mmol) synthesized in Example (85b) was dissolved in methylene chloride (20 mL), followed by cooling to −78° C., and boron tribromide (1.0 mol/L methylene chloride solution, 2.33 mL, 2.33 mmol) was added under nitrogen atmosphere. After the temperature was raised naturally and stirring was carried out at room temperature for 30 minutes, a saturated aqueous sodium hydrogencarbonate solution was added to neutralize the reaction solution, followed by extraction with methylene chloride (80 mL). The organic layer was washed with saturated brine, and subsequently dried over anhydrous magnesium sulfate. The solvent was distilled off under reduced pressure, and the resulting residue was purified using silica gel column chromatography (elution solvent: ethyl acetate/hexane=70%-100%) to afford the desired compound (738 mg, 71%) as a white solid.

Workup

  1. temperatureAfter the temperature was raised naturally
  2. extractionfollowed by extraction with methylene chloride (80 mL)
  3. washThe organic layer was washed with saturated brine
  4. dry with materialsubsequently dried over anhydrous magnesium sulfate
  5. distillationThe solvent was distilled off under reduced pressure
  6. customthe resulting residue was purified
  7. washsilica gel column chromatography (elution solvent: ethyl acetate/hexane=70%-100%)

Sources & evidence

ORD record
ord-98c7d87f631b4f668fde6b42a4a3b20b
Source dataset
uspto-grants-2011_09
DOI
10.6084/m9.figshare.5104873.v1
Patent number
US08017610B2

Reaction notes

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On this pageParticipantsConditionsProcedureWorkupSources & evidenceReaction notes