反応 #607466

反応方程式

Propanoyl chloride

anthranilic acid

hydrochloric acid

→

raw product

収率 78.2%

2-ethyl-4H-3,1-benzoxazin-4-one

収率 78.2%

溶媒

dichloromethane

反応条件

後処理

1. 1
   温度under reflux
2. 2
   その他After the end of the reaction
3. 3
   抽出the resulting mixture was extracted with ethyl acetate (100 mL)
4. 4
   乾燥the extract was dried with magnesium sulfate
5. 5
   その他the solvent was evaporated
6. 6
   workup.ADDITIONAcetic anhydride (15 mL) was added to the residue
7. 7
   温度to reflux
8. 8
   その他After the end of the reaction
9. 9
   その他the reaction medium spin dried at a temperature of 65° C.

実験手順

Propanoyl chloride (6.2 g, 67 mmol) was added to a solution of anthranilic acid (1 g, 7.3 mmol) in dichloromethane (20 mL). The reaction medium was kept under reflux and agitation, with the end of the reaction being monitored by CG/MS. After the end of the reaction, a hydrochloric acid solution was added (20 mL, 1M), and the resulting mixture was extracted with ethyl acetate (100 mL), the extract was dried with magnesium sulfate and the solvent was evaporated. Acetic anhydride (15 mL) was added to the residue and the reaction medium was taken to reflux and accompanied through CG/MS in order to monitor cyclization. After the end of the reaction, the reaction medium spin dried at a temperature of 65° C. using portions of toluene to facilitate the elimination of the anhydride. 1.0 g of the raw product 2-ethyl-4H-3,1-benzoxazin-4-one was obtained, which was used directly in the stage subsequent to reaction.

出典