반응 #2467963

반응 방정식

water

ammonium hydroxide

methyl 3-[(dimethylamino)diazenyl]-4-bromothiophene-2-carboxylate

→

product

수율 53.0%

3-[(Dimethylamino)diazenyl]-4-bromothiophene-2-carboxamide

수율 53.0%

용매

THF

반응 조건

후처리

1. 1
   workup.ADDITIONThe solution was poured into ice
2. 2
   추출extracted with ethyl acetate (3×50 mL)
3. 3
   세척The combined EtOAc 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 (10 mL) was added a solution of methyl 3-[(dimethylamino)diazenyl]-4-bromothiophene-2-carboxylate (500 mg) in THF (5 mL) for 5 min and stirred at rt for 20 h. The solution was poured into ice cooled water and extracted with ethyl acetate (3×50 mL). The combined EtOAc 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 chloroform-methanol (98:2) as eluents to give the product as an off-white solid (250 mg, 53%), mp 194-196° C. 1H NMR (400 MHz, DMSO-d6): δ 7.85 (1H, s), 7.75 (1H, br s), 7.56 (1H, br s), 3.56 (3H, br s), 3.21 (3H, br s); LC-MS (positive ion mode): m/z 277, 279 (M+H)+.

출처