Réaction #41416

Équation de réaction

4-Hydrazinobenzoic acid

cesiumcarbonate

2-fluoro-5-iodobenzaldehyde

citric acid

→

4-(5-iodoindazole-1-yl)-benzoic acid

Rendement 78.3%

Solvants

N-methylpyrrolidon

Conditions de réaction

Traitement

1. 1
   Températurethe reaction is heated for 4 h at 150° C
2. 2
   Températureto cool off
3. 3
   workup.STIRRINGvigorously stirred at r.t. for 30 min
4. 4
   FiltrationThe precipitate is filtered off
5. 5
   workup.STIRRINGThe slurry is vigorously stirred for 1 h
6. 6
   Autrethe filtrate evaporated
7. 7
   workup.ADDITIONis treated with 300 mL of a mixture of ethyl acetate/hexane (1:3)
8. 8
   workup.STIRRINGstirred overnight
9. 9
   Autredried

Mode opératoire

4-Hydrazinobenzoic acid (11.32 g, 60 mmol) and cesiumcarbonate (58.65 g, 180 mmol) are added to 2-fluoro-5-iodobenzaldehyde (15 g, 60 mmol) in 300 mL N-methylpyrrolidon. After 1 h stirring at r.t., the reaction is heated for 4 h at 150° C. The reaction mixture is allowed to cool off and poured on 1 L ice water. The reaction mixture is acidified with citric acid and vigorously stirred at r.t. for 30 min. The precipitate is filtered off and given in ethyl acetate. The slurry is vigorously stirred for 1 h and sucked off. The filter residue (few material) is discarded and the filtrate evaporated. This residue which is contaminated with N-methylpyrrolidine is treated with 300 mL of a mixture of ethyl acetate/hexane (1:3) and stirred overnight. The precipitated crystals are sucked off and dried. 17.11 g (78.32%) of 4-(5-iodoindazole-1-yl)-benzoic acid are obtained.

Source