Reacción #2467992

Ecuación de reacción

ammonium chloride

3-methyl-6-nitrothiopheno[2,3-d]1,2,3-triazin-4-one

Hydrochloric acid

→

solid

Rendimiento 7.5%

6-amino-3-methylthiopheno[2,3-d]1,2,3-triazin-4-one

Rendimiento 7.5%

Disolventes

water

methanol

Condiciones de reacción

Tratamiento posterior

1. 1
   Temperaturawarmed to 70 for 1 h
2. 2
   FiltraciónThe solution was filtered
3. 3
   ExtracciónThe solution was extracted with ethyl acetate (4×100 mL)
4. 4
   SecadoThe combined organic layer was dried over sodium sulfate
5. 5
   Filtraciónfiltered
6. 6
   OtroSolvent was evaporated
7. 7
   Otrothe residue was chromatographed over silica gel column

Procedimiento

To a solution of 3-methyl-6-nitrothiopheno[2,3-d]1,2,3-triazin-4-one (1.25 g, 5.9 mmol) in methanol (50 mL) was added conc. Hydrochloric acid (0.6 mL). To the above solution was added iron powder (1.67 g, 29.5 mmol) followed by a solution of ammonium chloride (1.57 g, 29.5 mmol) in water (10 mL) at rt. The reaction mixture was stirred and warmed to 70 for 1 h and was then allowed to cool to rt. The solution was filtered and basified with saturated sodium bicarbonate solution. The solution was extracted with ethyl acetate (4×100 mL). The combined organic layer was dried over sodium sulfate and filtered. Solvent was evaporated and the residue was chromatographed over silica gel column using hexane-ethyl: acetate (60:40) as eluents to give the product as a pale yellow color solid (80 mg, 7.5%), mp 190-194° C. 1H NMR (400 MHz, DMSO-d6): δ 7.40 (2H, s), 6.11 (1H, s), 3.82 (3H, s); LC-MS (negative ion mode): m/z 181 (M−H)−.

Fuente