Trifluoroacetic acid → Benzyl (S)-1-((1S,2R,4R)-2-acetamido-4-aminocyclohexyl)-2-oxopyrrolidin-3-ylcarbamate

HRID 2246600Notes

Reaction equation

HRID 2246600 reaction equation
[C:1]([NH:4][C@H:5]1[C@@H:10]([N:11]2[CH2:15][CH2:14][C@H:13]([NH:16][C:17]([O:19][CH2:20][C:21]3[CH:26]=[CH:25][CH:24]=[CH:23][CH:22]=3)=[O:18])[C:12]2=[O:27])[CH2:9][CH2:8][C@@H:7]([NH:28]C(=O)OC(C)(C)C)[CH2:6]1)(=[O:3])[CH3:2].C(O)(C(F)(F)F)=O>ClCCl>[C:1]([NH:4][C@@H:5]1[CH2:6][C@H:7]([NH2:28])[CH2:8][CH2:9][C@@H:10]1[N:11]1[CH2:15][CH2:14][C@H:13]([NH:16][C:17](=[O:18])[O:19][CH2:20][C:21]2[CH:22]=[CH:23][CH:24]=[CH:25][CH:26]=2)[C:12]1=[O:27])(=[O:3])[CH3:2]

Participants

4

Reactant 2

HCID 6422Trifluoroacetic acidHCID 86618124tert-butyl (1R,3R,4S)-3-acetamido-4-((S)-3-(benzyloxycarbonylamino)-2-oxopyrrolidin-1-yl)cyclohexylcarbamate

Product 1

HCID 44185158Benzyl (S)-1-((1S,2R,4R)-2-acetamido-4-aminocyclohexyl)-2-oxopyrrolidin-3-ylcarbamateYield 101.7%

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent

Procedure

To a solution of tert-butyl (1R,3R,4S)-3-acetamido-4-((S)-3-(benzyloxycarbonylamino)-2-oxopyrrolidin-1-yl)cyclohexylcarbamate (100 g, 0.205 mol; see Example 1, Step 6) in dichloromethane (400 ml) was added TFA (400 ml) at −20° C. The reaction solution was stirred at room temperature for 2 h. The solvent and most of TFA were removed under reduced pressure, and the residue was diluted with dichloromethane (2 L) and aqueous K2CO3 solution (2 L). The pH was adjusted to 10 with 1N HCl. The aqueous layer was extracted with dichloromethane (3×1 L). The combined organic layer was dried over Na2SO4, and concentrated to give benzyl (S)-1-((1S,2R,4R)-2-acetamido-4-aminocyclohexyl)-2-oxopyrrolidin-3-ylcarbamate as an oil (81 g, 100% yield). This amine was used directly in the next step without further purification.

Workup

  1. customThe solvent and most of TFA were removed under reduced pressure
  2. additionthe residue was diluted with dichloromethane (2 L) and aqueous K2CO3 solution (2 L)
  3. extractionThe aqueous layer was extracted with dichloromethane (3×1 L)
  4. dry with materialThe combined organic layer was dried over Na2SO4
  5. concentrationconcentrated

Sources & evidence

ORD record
ord-6b21866d31134fe898c5a5ef6e370c11
Source dataset
uspto-grants-2010_03
Patent number
US07687508B2

Reaction notes

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