Hydrochloric Acid → Oxiranemethanol, 4-methylbenzenesulfonate, (S)-

Participants

Reaction Steps

To a suspension of 37.5 g of potassium carbonate (0.27 mol) and 250 ml of 1,2-dichloroethane, was added dropwise at 24-28° C. 20 g of (S)-3-chloro-1,2-propanediol (0.18 mol) (optical purity: 98.9% ee). After finishing the addition, the solution was stirred for 26 hours and cooled. To the reaction solution were added dropwise under stirring at 5-10° C. 20.1 g of triethylamine (0.2 mol) and 0.4 g of N,N-dimethylaminopyridine (0.0033 mol) and 34.5 g of p-toluenesulfonyl chloride (0.18 ml) in order. After finishing the addition the mixture was stirred for 3 hours and the resulting salt was dissolved by adding 150 ml of 3% hydrochloric acid. The organic layer was washed with 150 ml of 1% hydrochloric acid and 150 ml of water. The excess solvent was removed under vacuo. The chemical purity and optical purity at that time were 93.7%, 96.6% ee respectively. The residue was recrystallized from isopropyl alcohol/hexane=1/1 (V/V) to give 28.9 g of (S)-glycidyl tosylate (yield 70%). Chemical purity: 98.3%, optical purity: 97.5% ee

Provenance & Evidence