Methyl p-toluenesulfonate → tert-Butyl (2S)-2-{(3S)-3-[[(6-chloro-2-naphthyl)sulfonyl](methyl)amino]-2-oxopyrrolidin-1-yl}propanoate

HRID 7280

Reaction equation

HRID 7280 reaction equation
[Cl:1][C:2]1[CH:3]=[C:4]2[C:9](=[CH:10][CH:11]=1)[CH:8]=[C:7]([S:12]([NH:15][C@H:16]1[CH2:20][CH2:19][N:18]([C@@H:21]([CH3:29])[C:22]([O:24][C:25]([CH3:28])([CH3:27])[CH3:26])=[O:23])[C:17]1=[O:30])(=[O:14])=[O:13])[CH:6]=[CH:5]2.[CH3:31][Si]([N-][Si](C)(C)C)(C)C.[Li+].S(C1C=CC(C)=CC=1)(OC)(=O)=O>C1COCC1>[Cl:1][C:2]1[CH:3]=[C:4]2[C:9](=[CH:10][CH:11]=1)[CH:8]=[C:7]([S:12]([N:15]([CH3:31])[C@H:16]1[CH2:20][CH2:19][N:18]([C@@H:21]([CH3:29])[C:22]([O:24][C:25]([CH3:26])([CH3:28])[CH3:27])=[O:23])[C:17]1=[O:30])(=[O:13])=[O:14])[CH:6]=[CH:5]2

Participants

5

Reactant 3

HCID 6645Methyl p-toluenesulfonateHCID 2733832Lithium HexamethyldisilazideHCID 69221511tert-butyl(2S)-2-((3S)-3-{[(6-chloro-2-naphthyl)sulfonyl]amino}-2-oxopyrrolidin-1-yl)propanoate

Product 1

HCID 69329782tert-Butyl (2S)-2-{(3S)-3-[[(6-chloro-2-naphthyl)sulfonyl](methyl)amino]-2-oxopyrrolidin-1-yl}propanoate

Reagents, catalysts & solvents 1

HCID 8028TetrahydrofuranSolvent

Procedure

A solution of tert-butyl (2S)-2-((3S)-3-{[(6-chloro-2-naphthyl)sulfonyl]amino}-2-oxopyrrolidin-1-yl)propanoate (0.1 g) in THF (5 ml) was cooled to −78° C. under nitrogen, and treated with lithium bis(trimethylsilyl) amide (1.0M solution in THF; 0.23 ml), followed by methyl tosylate (0.206 g). The resultant solution was allowed to reach room temperature and stirred for a further 16 h. The mixture was quenched with sodium acetate (0.074 g), stirred for 1 h and partitioned between water and ethyl acetate. The separated organic layer was washed with water, dried (over magnesium sulphate), and concentrated under reduced pressure. The residue was purified using SPE (silica, eluting with cyclohexane:ethyl acetate 10:1, 8:1, 5:1, 3:1, 2:1,1:1) to give the title compound (0.101 g) as a colourless gum.

Workup

  1. customto reach room temperature
  2. customThe mixture was quenched with sodium acetate (0.074 g)
  3. stirringstirred for 1 h
  4. custompartitioned between water and ethyl acetate
  5. washThe separated organic layer was washed with water
  6. dry with materialdried (over magnesium sulphate)
  7. concentrationconcentrated under reduced pressure
  8. customThe residue was purified
  9. washSPE (silica, eluting with cyclohexane:ethyl acetate 10:1, 8:1, 5:1, 3:1, 2:1,1:1)

Sources & evidence

ORD record
ord-45ff7524fc5340a38581577b0a458e5b
Source dataset
uspto-grants-2006_08
Patent number
US07084139B2

Linked notes

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