Diethyl Ether → (2R)-2-t-Butoxycarbonylamino-2-methyl-4-[1-methyl-5-(5-phenylpentanoyl)pyrrol-2-yl]-1-butanal

HRID 1869667Notes

Reaction equation

HRID 1869667 reaction equation
[C:1]([O:5][C:6]([NH:8][C@:9]([CH3:32])([CH2:12][CH2:13][C:14]1[N:15]([CH3:31])[C:16]([C:19](=[O:30])[CH2:20][CH2:21][CH2:22][CH2:23][C:24]2[CH:29]=[CH:28][CH:27]=[CH:26][CH:25]=2)=[CH:17][CH:18]=1)[CH2:10][OH:11])=[O:7])([CH3:4])([CH3:3])[CH3:2].[Cr](O[Cr]([O-])(=O)=O)([O-])(=O)=O.[NH+]1C=CC=CC=1.[NH+]1C=CC=CC=1.CCOCC>ClCCl>[C:1]([O:5][C:6]([NH:8][C@:9]([CH3:32])([CH2:12][CH2:13][C:14]1[N:15]([CH3:31])[C:16]([C:19](=[O:30])[CH2:20][CH2:21][CH2:22][CH2:23][C:24]2[CH:25]=[CH:26][CH:27]=[CH:28][CH:29]=2)=[CH:17][CH:18]=1)[CH:10]=[O:11])=[O:7])([CH3:4])([CH3:3])[CH3:2]

Participants

5

Reactant 3

HCID 3283Diethyl EtherHCID 2724130Cornforth reagentHCID 66672878(2R)-2-t-Butoxycarbonylamino-2-methyl-4-[1-methyl-5-(5-phenylpentanoyl)pyrrol-2-yl]butan-1-ol

Product 1

HCID 86596705(2R)-2-t-Butoxycarbonylamino-2-methyl-4-[1-methyl-5-(5-phenylpentanoyl)pyrrol-2-yl]-1-butanalYield 63%

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent

Procedure

To a solution of (2R)-2-t-butoxycarbonylamino-2-methyl-4-[1-methyl-5-(5-phenylpentanoyl)pyrrol-2-yl]butan-1-ol (0.3520 g, 0.80 mmol) obtained in Example (43a) in dichloromethane (8 ml) were added successively molecular sieves 4 A (0.2234 g) and pyridinium dichromate (0.4594 g, 1.22 mmol), and the resulting mixture was stirred at room temperature for 20 hours. After stirring, ether was added to the reaction mixture, and the resulting mixture was filtered. The filtrate was evaporated in vacuo, and the residue was purified by chromatography on a silica gel column using a mixed solvent of hexane and ethyl acetate (3:2) as the eluent to afford the title compound (0.2195 g, yield: 63%).

Workup

  1. stirringAfter stirring
  2. filtrationthe resulting mixture was filtered
  3. customThe filtrate was evaporated in vacuo
  4. customthe residue was purified by chromatography on a silica gel column

Sources & evidence

ORD record
ord-abe5c5f7109f46fa82495c574c578897
Source dataset
uspto-grants-2009_12
Patent number
US07638551B2

Reaction notes

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