Reaktion #7376

Reaktionsgleichung

lithium bis(trimethylsilyl) amide

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

methyl tosylate

→

title compound

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

Lösungsmittel

THF

Reaktionsbedingungen

Aufarbeitung

1. 1
   Sonstigeto reach room temperature
2. 2
   SonstigeThe mixture was quenched with sodium acetate (0.074 g)
3. 3
   workup.STIRRINGstirred for 1 h
4. 4
   Sonstigepartitioned between water and ethyl acetate
5. 5
   WaschenThe separated organic layer was washed with water
6. 6
   Trocknendried (over magnesium sulphate)
7. 7
   Einengenconcentrated under reduced pressure
8. 8
   SonstigeThe residue was purified
9. 9
   WaschenSPE (silica, eluting with cyclohexane:ethyl acetate 10:1, 8:1, 5:1, 3:1, 2:1,1:1)

Vorschrift

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.

Quelle