反応 #2293

反応方程式

triethylamine

4-ethoxyaniline

ethyl methylthioacetate

chlorine

→

expected product

5-Ethoxy-1,3-dihydroindol-2-one

溶媒

water

DCM

DCM

DCM

反応条件

後処理

1. 1
   workup.STIRRINGThe mixture is stirred for one hour at about -70° C.
2. 2
   その他the organic phase is decanted
3. 3
   乾燥dried over magnesium sulfate
4. 4
   その他evaporated under reduced pressure
5. 5
   workup.STIRRINGThe mixture is stirred for about 16 hours at room temperature
6. 6
   ろ過filtered
7. 7
   その他the precipitate is separated off
8. 8
   濃縮The filtrate is concentrated under reduced pressure

実験手順

23.6 g of ethyl methylthioacetate in 60 ml of DCM are added to a solution, cooled to about -70° C., of 12.5 g of chlorine in 400 ml of DCM. After stirring for 5 minutes at the same temperature, a solution of 4-ethoxyaniline (48.3 g) in 120 ml of DCM is added. The mixture is stirred for one hour at about -70° C., 39.3 ml of triethylamine are added and the resulting mixture is allowed to warm up to room temperature. 200 ml of water are added and the organic phase is decanted, dried over magnesium sulfate and evaporated under reduced pressure. The residue is taken up with 500 ml of isopropanol and 20 ml of concentrated hydrochloric acid. The mixture is stirred for about 16 hours at room temperature and filtered and the precipitate is separated off. The filtrate is concentrated under reduced pressure to give the expected product.

出典