Ethylene Glycol → (S)-benzyl 7-((S)-2-(methoxycarbonylamino)-3-methylbutanoyl)-1,4-dioxa-7-azaspiro[4.4]nonane-8-carboxylate

HRID 71963Notes

Reaction equation

HRID 71963 reaction equation
[CH3:1][O:2][C:3]([NH:5][C@@H:6]([CH:25]([CH3:27])[CH3:26])[C:7]([N:9]1[CH2:13][C:12](=[O:14])[CH2:11][C@H:10]1[C:15]([O:17][CH2:18][C:19]1[CH:24]=[CH:23][CH:22]=[CH:21][CH:20]=1)=[O:16])=[O:8])=[O:4].C1(C)C=CC(S(=O)=O)=CC=1.[CH2:38](O)[CH2:39][OH:40]>C1(C)C=CC=CC=1>[CH3:1][O:2][C:3]([NH:5][C@@H:6]([CH:25]([CH3:27])[CH3:26])[C:7]([N:9]1[C@H:10]([C:15]([O:17][CH2:18][C:19]2[CH:20]=[CH:21][CH:22]=[CH:23][CH:24]=2)=[O:16])[CH2:11][C:12]2([O:40][CH2:39][CH2:38][O:14]2)[CH2:13]1)=[O:8])=[O:4]

Participants

5

Reactant 3

HCID 174Ethylene GlycolHCID 59610664(S)-benzyl 1-((S)-2-(methoxycarbonylamino)-3-methylbutanoyl)-4-oxopyrrolidine-2-carboxylateHCID 178427284HCID 178427284, compound

Product 1

HCID 59611049(S)-benzyl 7-((S)-2-(methoxycarbonylamino)-3-methylbutanoyl)-1,4-dioxa-7-azaspiro[4.4]nonane-8-carboxylate

Reagents, catalysts & solvents 1

HCID 1140TolueneSolvent

Procedure

(S)-benzyl 1-((S)-2-(methoxycarbonylamino)-3-methylbutanoyl)-4-oxopyrrolidine-2-carboxylate (2.45 g, 6.51 mmol) in a round bottom flask was dissolved in anhydrous toluene (200 mL) and p-toluene sulfonic acid monohydride (124 mg, 0.1 mmol) and ethylene glycol (808 mg, 13.02 mmol) were added and the mixture was refluxed for 18 hours, removing the generated byproduct water with a Dean-Stark apparatus. The crude mixture was then diluted with ethyl acetate and washed, respectively, with 10% citric acid, saturated ammonium chloride, 10% sodium carbonate and finally with brine. The organic layers were combined and dried over sodium sulfate and concentrated down on rotovap. The crude residue was then purified on normal phase column chromatography with 5% MeOH/DCM. (2.3 g, 84%)

Workup

  1. temperaturethe mixture was refluxed for 18 hours
  2. customremoving the generated byproduct water with a Dean-Stark apparatus
  3. additionThe crude mixture was then diluted with ethyl acetate
  4. washwashed
  5. dry with materialdried over sodium sulfate
  6. concentrationconcentrated down on rotovap
  7. customThe crude residue was then purified on normal phase column chromatography with 5% MeOH/DCM

Sources & evidence

ORD record
ord-64781eccf4984efdb66a4b3f6c676343
Source dataset
uspto-grants-2014_09
Patent number
US08822430B2

Reaction notes

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