Réaction #502061

Équation de réaction

4-hydroxytetrahydrothiopyran

triethyl amine

methacryloyl chloride

→

tetrahydro-2H-thiopyran-4-yl methacrylate

Rendement 61.3%

Solvants

methylene chloride

Conditions de réaction

Traitement

1. 1
   AutreTo a 200-mL three-necked flask fitted with a stirrer bar
2. 2
   Autrethe resulted mixture was reacted at 0° C. for 40 minutes
3. 3
   Températureto warm to room temperature
4. 4
   Autrewas further reacted for another 5 hours
5. 5
   workup.ADDITIONthe reaction solution was poured into a 300-mL separatory funnel
6. 6
   Lavagewashed with 100 mL of water
7. 7
   Séchagedried with anhydrous sodium sulfate
8. 8
   AutreFrom the obtained solution, the solvent was removed by an evaporator
9. 9
   Autreto obtain an oily crude product
10. 10
    AutreThe crude product was purified by silica gel chromatography

Mode opératoire

To a 200-mL three-necked flask fitted with a stirrer bar coated with Teflon™, were added 5.37 g of 4-hydroxytetrahydrothiopyran (manufactured by SANKYO KASEI Co., Ltd.), 5.08 g of triethyl amine, and 50 mL of dried methylene chloride, and the mixture was stirred under nitrogen atmosphere at 0° C. To the mixture, 5.0 g of methacryloyl chloride was slowly added through a dropping funnel, and the resulted mixture was reacted at 0° C. for 40 minutes, allowed to warm to room temperature, and was further reacted for another 5 hours. After confirming loss of the starting material by a thin layer chromatography (TLC), the reaction solution was poured into a 300-mL separatory funnel, washed with 100 mL of water followed by 100 mL of saturated NaCl solution (brine), and dried with anhydrous sodium sulfate. From the obtained solution, the solvent was removed by an evaporator, to obtain an oily crude product. The crude product was purified by silica gel chromatography using a mixed solution of n-hexane and ethyl acetate to give 5.18 g of tetrahydro-2H-thiopyran-4-yl methacrylate (thiopyran derivative of the following formula 2) (yield: 61.3%).

Source