Reacción #976309

Ecuación de reacción

NaHSO3

iodine

N-methoxy-N-methyl-1H-indazole-3-carboxamide

bis(trifluoroacetoxy)iodobenzene

→

5-iodo-N-methoxy-N-methyl-1H-indazole-3-carboxamide

Rendimiento 72.0%

Disolventes

DCM

Condiciones de reacción

Tratamiento posterior

1. 1
   Otroto precipitate which
2. 2
   Filtraciónwas filtered
3. 3
   Lavadorinsed with excess DCM
4. 4
   LavadoThe filtrate was washed with brine
5. 5
   Secadodried over MgSO4
6. 6
   Concentraciónconcentrated
7. 7
   Otrothe remaining solid was triturated with a minimal amount of DCM
8. 8
   SecadoThe combined solids were dried under vacuum over KOH

Procedimiento

To the N-methoxy-N-methyl-1H-indazole-3-carboxamide (IX) (20 g, 97.4 mmol) in 1 L DCM was added bis(trifluoroacetoxy)iodobenzene (46 g, 107 mmol) followed by portionwise addition of iodine (14.84 g, 58.5 mmol) at r.t. After 1 hour, 600 mL of saturated NaHSO3 was added and a solid began to precipitate which was filtered and rinsed with excess DCM. The filtrate was washed with brine, dried over MgSO4, concentrated and the remaining solid was triturated with a minimal amount of DCM. The combined solids were dried under vacuum over KOH to produce 5-iodo-N-methoxy-N-methyl-1H-indazole-3-carboxamide (X) as a white solid (23.2 g, 70 mmol, 72% yield).

Fuente