반응 #1006

반응 방정식

2-methoxy-5-amino-pyridine

ammonium chloride

4-oxo-4,5,6,7-tetrahydro-1H-indole-3-carboxylic acid

triethylamine

ethyl chloroformate

→

N-(4-methoxy-3-pyridyl)-4-oxo-4,5,6,7-tetrahydro-1H-indole 3-carboxamide

수율 19.6%

용매

N,N-dimethylformamide

N,N-dimethylformamide

반응 조건

후처리

1. 1
   workup.STIRRINGto stir for an additional 75 minutes
2. 2
   추출extracted 2× with ethyl acetate
3. 3
   세척The combined organic layers were washed with water
4. 4
   건조dried over magnesium sulfate
5. 5
   여과filtered
6. 6
   농축concentrated in vacuo
7. 7
   workup.ADDITIONTo the residue was added aqueous 5N sodium hydroxide (5 mL) and ethyl alcohol (1 mL)
8. 8
   온도heated
9. 9
   온도at reflux for 1 hour
10. 10
    온도After cooling in an ice water bath
11. 11
    workup.ADDITIONthe reaction mixture was poured into saturated aqueous ammonium chloride
12. 12
    추출extracted 2× with ethyl acetate
13. 13
    건조The combined organic layers were dried over magnesium sulfate
14. 14
    여과filtered
15. 15
    농축concentrated in vacuo
16. 16
    기타the residue recrystallized from ethyl acetate

실험 절차

To a stirring solution of 4-oxo-4,5,6,7-tetrahydro-1H-indole-3-carboxylic acid (179 mg, 1 mmol) and triethylamine (293 μl, 2.1 mmol) in N,N-dimethylformamide (3 mL) at 0° C. was added ethyl chloroformate (191 μl, 2 mmol). After stirring an additional 30 minutes, a solution of 2-methoxy-5-amino-pyridine (216 mg, 2 mmol) in N,N-dimethylformamide (3 mL) was added. The reaction mixture was allowed to stir for an additional 75 minutes, then poured into saturated aqueous ammonium chloride and extracted 2× with ethyl acetate. The combined organic layers were washed with water, dried over magnesium sulfate, filtered, and concentrated in vacuo. To the residue was added aqueous 5N sodium hydroxide (5 mL) and ethyl alcohol (1 mL), then heated at reflux for 1 hour. After cooling in an ice water bath, the reaction mixture was poured into saturated aqueous ammonium chloride and extracted 2× with ethyl acetate. The combined organic layers were dried over magnesium sulfate, filtered, concentrated in vacuo, and the residue recrystallized from ethyl acetate to give N-(4-methoxy-3-pyridyl)-4-oxo-4,5,6,7-tetrahydro-1H-indole 3-carboxamide (56 mg); m.p. 209°-210° C. (Compound 1).

출처