반응 #47731

반응 방정식

2,4-dihydroxy benzaldehyde

N-acetylglycine

sodium acetate

NaN3

NaNO2

KBr

→

3-azido-7-hydroxycoumarin

용매

acetic anhydride

반응 조건

후처리

1. 1
   온도was refluxed
2. 2
   workup.ADDITIONThe reaction mixture was poured onto icde
3. 3
   기타to give a yellow precipitate
4. 4
   여과After filtration
5. 5
   세척the yellow solid washed with ice water before it
6. 6
   온도was refluxed in a solution of concentrated HCl and ethanol (2:1, 30 ml) for 1 hour
7. 7
   workup.ADDITIONice water was added
8. 8
   workup.ADDITIONto dilute the solution
9. 9
   온도The solution was then cooled in an ice bath
10. 10
    workup.STIRRINGThe mixture was stirred for 5-10 minutes
11. 11
    workup.STIRRINGAfter stirring for another 15 minutes
12. 12
    여과the resulting precipitate was filtered off
13. 13
    세척washed with water
14. 14
    기타dried under reduced pressure
15. 15
    기타to afford a brown solid
16. 16
    기타2.2 g (54% overall yield)

실험 절차

A mixture of 2,4-dihydroxy benzaldehyde (2.76 g, 20 mmol), N-acetylglycine (2.34 g, 20 mmol), anhydrous sodium acetate (60 mmol) in acetic anhydride (100 ml) was refluxed under stirring for 4 hours. The reaction mixture was poured onto icde to give a yellow precipitate. After filtration, the yellow solid washed with ice water before it was refluxed in a solution of concentrated HCl and ethanol (2:1, 30 ml) for 1 hour, then ice water was added to dilute the solution. The solution was then cooled in an ice bath and NaNO2 (40 mmol) was added. The mixture was stirred for 5-10 minutes and NaN3 (60 mmol) was added in portions. After stirring for another 15 minutes, the resulting precipitate was filtered off, washed with water, and dried under reduced pressure to afford a brown solid: 2.2 g (54% overall yield). The product was pure enough for further reactions. 1H NMR (DMSO-d6, 300 MHz) δ 6.74 (d, J=2.2 Hz, 1H), 6.79 (dd, J=8.4. 2.2 Hz, 1H), 7.47 (d, J=8.5 Hz, 1H), 7.56 (s, 1H). 13C NMR (DMSO-d6, 75 MHz) δ 161.0, 158.0, 153.4, 128.7, 128.5, 121.8, 114.5, 112.0, 102.7. IR (KBr): 3296 (s), 2125 (vs), 1680 (s), 1620 (m), 1321 (s). EI-HRMS m/e calculated for M+ C9H5N3O3 203.0331; found 203.0326.

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