Réaction #50272

Équation de réaction

water

cesium carbonate

(3R)-6-(Pivaloylthiomethyl)-5-oxo-1thia-4-azacyclotridecane-3-carboxylic acid

benzyl bromide

→

benzyl (3R)-6-(pivaloylthiomethyl)-5-oxo-1-thia-4-azacyclotridecane-3-carboxylate

Solvants

dimethylformamide

Conditions de réaction

Traitement

1. 1
   Extractionextracted with ethyl acetate (2×100 ml)
2. 2
   LavageThe combined organic layers are washed with water (2×100 ml), brine (1×200 ml)
3. 3
   Séchagedried (MgSO4)
4. 4
   Autrethe solvent is evaporated

Mode opératoire

(3R)-6-(Pivaloylthiomethyl)-5-oxo-1thia-4-azacyclotridecane-3-carboxylic acid (0.25 g, 0.64 mmol) is dissolved in dimethylformamide (5 ml) and cesium carbonate (0.23 g, 0.71 mmol) is added, followed by benzyl bromide (0.11 g, 0.64 mmol). The mixture is stirred overnight at room temperature, poured into water (300 ml) and extracted with ethyl acetate (2×100 ml). The combined organic layers are washed with water (2×100 ml), brine (1×200 ml), dried (MgSO4) and the solvent is evaporated. Silica gel chromatography (3% ethyl acetate/hexane) gives benzyl (3R)-6-(pivaloylthiomethyl)-5-oxo-1-thia-4-azacyclotridecane-3-carboxylate, m.p. 135°-137° C.

Source