Reaktion #74521

Reaktionsgleichung

dichloromethane methanol acetic acid

1-(ethoxymethyl)-5-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-pyrazole

3-cyano-N-(1,2,4-thiadiazol-5-yl)-4-[2-iodo-4-(trifluoromethoxy)phenoxy]benzenesulfonamide

1-(ethoxymethyl)-5-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-pyrazole

sodium carbonate

→

title compound

Ausbeute 46.9%

3-cyano-4-[2-(1H-pyrazol-5-yl)-4-(trifluoromethoxy)phenoxy]-N-1,2,4-thiadiazol-5-ylbenzenesulfonamide

Ausbeute 46.9%

Lösungsmittel

water

1,4-dioxane

HCl

1,4-dioxane

Reaktionsbedingungen

Aufarbeitung

1. 1
   SonstigeThe reaction was quenched by the addition of ethyl acetate (20 mL) and saturated aqueous brine solution (20 mL)
2. 2
   SonstigeThe organic layer was collected
3. 3
   Trocknendried over sodium sulphate
4. 4
   Einengenconcentrated in vacuo before purification
5. 5
   Sonstigeto afford a white solid
6. 6
   workup.STIRRINGstirred at room temperature for 4 hours before concentration in vacuo and purification
7. 7
   Sonstigeto afford a residue that
8. 8
   Sonstigewas triturated in dichloromethane (5 mL)

Vorschrift

3-cyano-N-(1,2,4-thiadiazol-5-yl)-4-[2-iodo-4-(trifluoromethoxy)phenoxy]benzenesulfonamide (Preparation 760, 500 mg, 0.88 mmol), 1-(ethoxymethyl)-5-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-pyrazole (Preparation 337, 600 mg, 1.4 mmol), palladium (0) tetrakis triphenylphosphine (78 mg, 0.067 mmol) and sodium carbonate (420 mg, 3.963 mmol) were dissolved in a mixture of water (4 mL) and 1,4-dioxane (12 mL) and heated to 85° C. under N2 for 7 hours. Further 1-(ethoxymethyl)-5-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-pyrazole (100 mg 0.23 mmol) and palladium (0) tetrakis triphenylphosphine (10 mg, 0.008 mmol) were added and the reaction stirred at 85° C. under N2 for 18 hours. The reaction was quenched by the addition of ethyl acetate (20 mL) and saturated aqueous brine solution (20 mL). The organic layer was collected, dried over sodium sulphate and concentrated in vacuo before purification using silica gel column chromatography (v/v/v dichloromethane:methanol:acetic acid v/v/v 100:0:0 to 95:5:0.5) to afford a white solid. This was dissolved in 4M HCl in 1,4-dioxane (5 mL) and stirred at room temperature for 4 hours before concentration in vacuo and purification using silica gel column chromatography (v/v/v dichloromethane:methanol:acetic acid 100:0:0 to 90:10:1 to afford a residue that was triturated in dichloromethane (5 mL) to afford 210 mg of the title compound as a white solid as the HCl salt.

Quelle