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Methyl N-(triethylammoniosulfonyl)carbamate → tert-butyl 4-[(4S)-4-(methoxycarbonyl)-4,5-dihydro-1,3-oxazol-2-yl]-1H-indole-1-carboxylate

HRID 2389371
Notes
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Reaction equation

HRID 2389371 reaction equation
[OH:1][CH2:2][C@H:3]([NH:8][C:9]([C:11]1[CH:19]=[CH:18][CH:17]=[C:16]2[C:12]=1[CH:13]=[CH:14][N:15]2[C:20]([O:22][C:23]([CH3:26])([CH3:25])[CH3:24])=[O:21])=O)[C:4]([O:6][CH3:7])=[O:5].CC[N+](S(N=C(OC)[O-])(=O)=O)(CC)CC>C1COCC1.CCOC(C)=O>[CH3:7][O:6][C:4]([C@@H:3]1[CH2:2][O:1][C:9]([C:11]2[CH:19]=[CH:18][CH:17]=[C:16]3[C:12]=2[CH:13]=[CH:14][N:15]3[C:20]([O:22][C:23]([CH3:25])([CH3:26])[CH3:24])=[O:21])=[N:8]1)=[O:5]
ParticipantsConditionsProcedureWorkupSources & evidenceReaction notes

Participants

5

Reactant 2

HCID 2724994Methyl N-(triethylammoniosulfonyl)carbamateHCID 68536502tert-butyl 4-({[(1S)-1-(hydroxymethyl)-2-methoxy-2-oxoethyl]amino}carbonyl)-1H-indole-1-carboxylate

Product 1

HCID 68535383tert-butyl 4-[(4S)-4-(methoxycarbonyl)-4,5-dihydro-1,3-oxazol-2-yl]-1H-indole-1-carboxylateYield 68%

Reagents, catalysts & solvents 2

HCID 8028TetrahydrofuranSolvent
HCID 8857
Ethyl Acetate
Solvent

Conditions

Temperature
70 °C

Procedure

To a solution of tert-butyl 4-({[(1S)-1-(hydroxymethyl)-2-methoxy-2-oxoethyl]amino}carbonyl)-1H-indole-1-carboxylate (2.09 g) in THF (21.0 mL) was added Burgess Reagent (1.44 g) at ambient temperature and the mixture was stirred at 70° C. for 45 minutes. The resulting mixture was diluted with EtOAc (60 mL) and washed successively with saturated NaHCO3 aqueous solution and brine. The organic layer was dried over anhydrous MgSO4, filtered and evaporated in vacuo. The residue was purified by silica gel column chromatography (n-hexane:EtOAc=2:1) to afford tert-butyl 4-[(4S)-4-(methoxycarbonyl)-4,5-dihydro-1,3-oxazol-2-yl]-1H-indole-1-carboxylate (1.35 g) as a colorless amorphous.

Workup

  1. washwashed successively with saturated NaHCO3 aqueous solution and brine
  2. dry with materialThe organic layer was dried over anhydrous MgSO4
  3. filtrationfiltered
  4. customevaporated in vacuo
  5. customThe residue was purified by silica gel column chromatography (n-hexane:EtOAc=2:1)

Sources & evidence

ORD record
ord-541ba14ba56642a286980a8b836473dd
Source dataset
uspto-grants-2012_09
DOI
10.6084/m9.figshare.5104873.v1
Patent number
US08273745B2

Reaction notes

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On this pageParticipantsConditionsProcedureWorkupSources & evidenceReaction notes