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

HRID 1964674Notes

Reaction equation

HRID 1964674 reaction equation
O[C@H:2]([CH2:35][CH3:36])[CH2:3][NH:4][C:5]([C:7]1[NH:8][C:9]([C:12]2[CH:17]=[C:16]([O:18][Si:19]([CH:26]([CH3:28])[CH3:27])([CH:23]([CH3:25])[CH3:24])[CH:20]([CH3:22])[CH3:21])[CH:15]=[C:14]([O:29][C@@H:30]([CH3:34])[CH2:31][O:32][CH3:33])[CH:13]=2)=[CH:10][CH:11]=1)=[O:6].CS(O)(=O)=O.C(N(CC)CC)C.[Cl-].[NH4+]>O1CCCC1>[CH2:35]([C@@H:2]1[O:6][C:5]([C:7]2[NH:8][C:9]([C:12]3[CH:17]=[C:16]([O:18][Si:19]([CH:23]([CH3:25])[CH3:24])([CH:26]([CH3:28])[CH3:27])[CH:20]([CH3:21])[CH3:22])[CH:15]=[C:14]([O:29][C@@H:30]([CH3:34])[CH2:31][O:32][CH3:33])[CH:13]=3)=[CH:10][CH:11]=2)=[N:4][CH2:3]1)[CH3:36]

Participants

6

Reactant 4

HCID 6395Methanesulfonic AcidHCID 8471TriethylamineHCID 25517Ammonium ChlorideHCID 66890347N-[(2R)-2-Hydroxybutyl]-5-(3-{[(2S)-1-methoxypropan-2-yl]oxy}-5-[(tripropan-2-ylsilyl)oxy]phenyl)-1H-pyrrole-2-carboxamide

Product 1

HCID 66891446(5S)-5-Ethyl-2-[5-(3-{[(2S)-1-methoxypropan-2-yl]oxy}-5-[(tripropan-2-ylsilyl)oxy]phenyl)-1H-pyrrol-2-yl]-4,5-dihydro-1,3-oxazoleYield 100.4%

Reagents, catalysts & solvents 1

HCID 8028TetrahydrofuranSolvent

Conditions

Temperature
50 °C

Procedure

N-[(2R)-2-Hydroxybutyl]-5-(3-{[(2S)-1-methoxypropan-2-yl]oxy}-5-[(tripropan-2-ylsilyl)oxy]phenyl)-1H-pyrrole-2-carboxamide (1.01 g, 1.95 mmol) synthesized in Example (106d) was dissolved in tetrahydrofuran (40 mL), and anhydrous methanesulfonic acid (600 mg, 3.44 mmol) and triethylamine (1.60 mL, 11.48 mmol) were added, followed by stirring at 50° C. for 8 hours under nitrogen atmosphere. To the reaction solution, a saturated aqueous ammonium chloride solution (50 mL) was added, and extraction was carried out 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=50%-70%) to afford the desired compound (980 mg, yield 100%) as a yellow solid.

Workup

  1. extractionextraction
  2. washThe organic layer was washed with saturated brine
  3. dry with materialsubsequently dried over anhydrous magnesium sulfate
  4. distillationThe solvent was distilled off under reduced pressure
  5. customthe resulting residue was purified
  6. washsilica gel column chromatography (elution solvent: ethyl acetate/hexane=50%-70%)

Sources & evidence

ORD record
ord-b696bceb86584c70982efae6eb076409
Source dataset
uspto-grants-2013_04
Patent number
US08415359B2

Reaction notes

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