Methanesulfonic Acid → (4R,5S)-2-[5-(3-{[(2S)-1-Methoxypropan-2-yl]oxy}-5-[(tripropan-2-ylsilyl)oxy]phenyl)-1H-pyrrol-2-yl]-4,5-dimethyl-4,5-dihydro-1,3-oxazole

HRID 1964685Notes

Reaction equation

HRID 1964685 reaction equation
[OH:1][C@H:2]([CH3:36])[C@H:3]([NH:5][C:6]([C:8]1[NH:9][C:10]([C:13]2[CH:18]=[C:17]([O:19][Si:20]([CH:27]([CH3:29])[CH3:28])([CH:24]([CH3:26])[CH3:25])[CH:21]([CH3:23])[CH3:22])[CH:16]=[C:15]([O:30][C@@H:31]([CH3:35])[CH2:32][O:33][CH3:34])[CH:14]=2)=[CH:11][CH:12]=1)=O)[CH3:4].CS(O)(=O)=O.C(N(CC)CC)C.[Cl-].[NH4+]>O1CCCC1>[CH3:34][O:33][CH2:32][C@@H:31]([O:30][C:15]1[CH:14]=[C:13]([C:10]2[NH:9][C:8]([C:6]3[O:1][C@@H:2]([CH3:36])[C@@H:3]([CH3:4])[N:5]=3)=[CH:12][CH:11]=2)[CH:18]=[C:17]([O:19][Si:20]([CH:24]([CH3:26])[CH3:25])([CH:21]([CH3:23])[CH3:22])[CH:27]([CH3:29])[CH3:28])[CH:16]=1)[CH3:35]

Participants

6

Reactant 4

HCID 6395Methanesulfonic AcidHCID 8471TriethylamineHCID 25517Ammonium ChlorideHCID 66681067N-[(2R,3R)-3-Hydroxybutan-2-yl]-5-(3-{[(2S)-1-methoxypropan-2-yl]oxy}-5-[(tripropan-2-ylsilyl)oxy]phenyl)-1H-pyrrole-2-carboxamide

Product 1

HCID 66683078(4R,5S)-2-[5-(3-{[(2S)-1-Methoxypropan-2-yl]oxy}-5-[(tripropan-2-ylsilyl)oxy]phenyl)-1H-pyrrol-2-yl]-4,5-dimethyl-4,5-dihydro-1,3-oxazoleYield 100.6%

Reagents, catalysts & solvents 1

HCID 8028TetrahydrofuranSolvent

Procedure

N-[(2R,3R)-3-Hydroxybutan-2-yl]-5-(3-{[(2S)-1-methoxypropan-2-yl]oxy}-5-[(tripropan-2-ylsilyl)oxy]phenyl)-1H-pyrrole-2-carboxamide (722 mg, 1.39 mmol) synthesized in Example (109a) was dissolved in tetrahydrofuran (30 mL), and anhydrous methanesulfonic acid (430 mg, 2.47 mmol) and triethylamine (1.20 mL, 8.61 mmol) were added, and stirring was carried out at 50° C. overnight under nitrogen atmosphere. The reaction solution was brought back to room temperature, and a saturated aqueous ammonium chloride solution (50 mL) was added, followed by extraction with methylene chloride (50 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=40%-70%) to afford the desired compound (700 mg, yield 100%) as a yellow liquid.

Workup

  1. customwas brought back to room temperature
  2. extractionfollowed by extraction with methylene chloride (50 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=40%-70%)

Sources & evidence

ORD record
ord-a6dbb27809f74667a220ceb8304d1f85
Source dataset
uspto-grants-2013_04
Patent number
US08415359B2

Reaction notes

Loading…