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Water → 2,2-Dimethyl-4-(2-methoxymethoxyphenyl)-5-oxopiperazine-1-carboxylic acid t-butyl ester

HRID 1694908
Notes
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Reaction equation

HRID 1694908 reaction equation
C(N(C(C)C)CC)(C)C.[CH3:10][O:11][CH2:12]Cl.[C:14]([O:18][C:19]([N:21]1[CH2:26][C:25](=[O:27])[N:24]([C:28]2[CH:33]=[CH:32][CH:31]=[CH:30][C:29]=2[OH:34])[CH2:23][C:22]1([CH3:36])[CH3:35])=[O:20])([CH3:17])([CH3:16])[CH3:15].O>C(Cl)Cl>[C:14]([O:18][C:19]([N:21]1[CH2:26][C:25](=[O:27])[N:24]([C:28]2[CH:33]=[CH:32][CH:31]=[CH:30][C:29]=2[O:34][CH2:10][O:11][CH3:12])[CH2:23][C:22]1([CH3:36])[CH3:35])=[O:20])([CH3:17])([CH3:15])[CH3:16]
ParticipantsProcedureWorkupSources & evidenceReaction notes

Participants

6

Reactant 4

HCID 962WaterHCID 7864Chloromethyl Methyl EtherHCID 81531DiisopropylethylamineHCID 666456104-(2-Hydroxyphenyl)-2,2-dimethyl-5-oxopiperazine-1-carboxylic acid t-butyl ester

Product 1

HCID 666457882,2-Dimethyl-4-(2-methoxymethoxyphenyl)-5-oxopiperazine-1-carboxylic acid t-butyl esterYield 100.3%

Reagents, catalysts & solvents

1
HCID 6344DichloromethaneSolvent

Procedure

0.72 ml of diisopropylethylamine (4.10 mmol) and 0.16 ml of methoxymethyl chloride (2.05 mmol) were added to a solution of 400 mg of 4-(2-hydroxyphenyl)-2,2-dimethyl-5-oxopiperazine-1-carboxylic acid t-butyl ester obtained in Example (10d) (1.36 mmol) in methylene chloride (14 ml), and the mixture was stirred at room temperature overnight. Water was added to the reaction mixture, followed by extraction with methylene chloride. Then, the organic layer was washed with brine and dried over anhydrous sodium sulfate. After filtration, the solvent was evaporated under reduced pressure, and the residue was purified by silica gel column chromatography (elution solvent:n-hexane/ethyl acetate=1/1) to obtain 497 mg of 2,2-dimethyl-4-(2-methoxymethoxyphenyl)-5-oxopiperazine-1-carboxylic acid t-butyl ester (yield: quant.).

Workup

  1. extractionfollowed by extraction with methylene chloride
  2. washThen, the organic layer was washed with brine
  3. dry with materialdried over anhydrous sodium sulfate
  4. filtrationAfter filtration
  5. customthe solvent was evaporated under reduced pressure
  6. customthe residue was purified by silica gel column chromatography (elution solvent:n-hexane/ethyl acetate=1/1)

Sources & evidence

ORD record
ord-46c989a56eed4931b8fcde1214e78e52
Source dataset
uspto-grants-2012_04
DOI
10.6084/m9.figshare.5104873.v1
Patent number
US08158790B2

Reaction notes

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On this pageParticipantsProcedureWorkupSources & evidenceReaction notes