반응 #2467966

반응 방정식

water

ammonium hydroxide

methyl 3-[(dimethylamino)diazenyl]-5-nitrothiophene-2-carboxylate

→

solid

수율 26.0%

3-[(Dimethylamino)diazenyl]-5-nitrothiophene-2-carboxamide

수율 26.0%

용매

THF

반응 조건

후처리

1. 1
   workup.ADDITIONThe solution was poured into ice
2. 2
   추출extracted with ethyl acetate (3×100 mL)
3. 3
   세척The combined organic layer was washed with water, brine
4. 4
   건조dried over sodium sulfate
5. 5
   여과The solution was filtered
6. 6
   기타evaporated the solvent
7. 7
   기타The residue was chromatographed over silica gel column

실험 절차

To an ice cold (0-5° C.) solution of ammonium hydroxide (35 mL) was added a solution of methyl 3-[(dimethylamino)diazenyl]-5-nitrothiophene-2-carboxylate (400 mg) in THF (10 mL) for 5 min and stirred at rt for 20 h. The solution was poured into ice cooled water and extracted with ethyl acetate (3×100 mL). The combined organic layer was washed with water, brine and dried over sodium sulfate. The solution was filtered and evaporated the solvent. The residue was chromatographed over silica gel column using hexane-ethyl acetate (50:50) as eluents to give the product as a yellow color solid (90 mg, 26%), mp 240-246° C. 1H NMR (400 MHz, DMSO-d6): δ 8.22 (1H, s), 8.05 (1H, s), 7.91 (1H, s), 3.63 (3H, s), 3.26 (3H, s); LC-MS (positive ion mode): m/z 266 (M+Na)+.

출처