Reaktion #87885

Reaktionsgleichung

Oxalyl chloride

5-(1-methyl-1H-pyrazol-4-yl)-2-naphthoic acid

guanidine hydrochloride

sodium hydroxide

→

5-(1-methyl-1H-pyrazol-4-yl)-2-naphthoylguanidine

Ausbeute 83.2%

Lösungsmittel

dichloromethane

Reaktionsbedingungen

Aufarbeitung

1. 1
   workup.ADDITIONwas added in portions during the reaction to effect dissolution))
2. 2
   TemperaturThe reaction mixture was then heated for 1 hour at 40° C.
3. 3
   Einengenbefore being concentrated under reduced pressure
4. 4
   workup.STIRRINGthe reaction mixture was then stirred for 30 minutes
5. 5
   SonstigeThe organic phase was separated
6. 6
   Extraktionthe aqueous phase was extracted with chloroform (3×30 mL)
7. 7
   WaschenThe combined organic extracts were washed sequentially with 1M aqueous sodium hydroxide (60 mL) and water (40 mL)
8. 8
   Trocknendried (Na2SO4)
9. 9
   Einengenconcentrated in vacuo
10. 10
    Sonstigeto give
11. 11
    Sonstigea glassy solid (1.45 g after drying under high vacuum)
12. 12
    workup.DISSOLUTIONThis solid was dissolved in dichloromethane which
13. 13
    Sonstigeto evaporate slowly

Vorschrift

Oxalyl chloride (1.1 mL, 13 mmol) was added to a solution of 5-(1-methyl-1H-pyrazol-4-yl)-2-naphthoic acid (1.19 g, 4.71 mmol) in anhydrous dichloromethane (200 mL (which was added in portions during the reaction to effect dissolution)) containing dimethylformamide (2 drops) under nitrogen and the mixture was stirred at room temperature for 4.25 hours. The reaction mixture was then heated for 1 hour at 40° C., before being concentrated under reduced pressure. The resulting crude acid chloride was suspended in anhydrous tetrahydrofuran (50 mL) and this mixture was added dropwise to a solution of guanidine hydrochloride (2.09 g, 21.9 mmol) in 2M aqueous sodium hydroxide (15 mL, 30 mmol) and the reaction mixture was then stirred for 30 minutes. The organic phase was separated, and the aqueous phase was extracted with chloroform (3×30 mL) followed by ethyl acetate (3×30 mL). The combined organic extracts were washed sequentially with 1M aqueous sodium hydroxide (60 mL) and water (40 mL), then dried (Na2SO4) and concentrated in vacuo to give a glassy solid (1.45 g after drying under high vacuum). This solid was dissolved in dichloromethane which was then allowed to evaporate slowly to give 5-(1-methyl-1H-pyrazol-4-yl)-2-naphthoylguanidine as a yellow solid (1.15 g, 83%).

Quelle