Potassium Carbonate → 3-Chloro-6-(1-methyl-1H-pyrazol-4-yl)pyridazine

Participants

Reaction Conditions

Reaction Steps

To a 3000 mL round bottom flask containing a solution of 1-methyl-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-pyrazole (76 g, 365.3 mmol), 3,6-dichloropyridazine (68 g, 456.4 mmol) in 1,4-dioxane (1200 mL) is added a aqueous solution of K2CO3 (127 g, 919 mmol) in water (480 mL). After [1,1′-bis(diphenylphosphino)ferrocene]palladium(II) chloride (7.5 g, 9.2 mmol) is added, the mixture is purged with N2 for 20 min and stirred at 80° C. for 16 h. The reaction mixture is poured into water (300 mL) and dichloromethane (2000 mL), and the aqueous layer is extracted with DCM (3×800 mL). The combined organic layers are dried over anhydrous Na2SO4 and concentrated under vacuum. The crude product is purified with silica gel column eluting with DCM/methanol (40:1) to give the title compound as a pale yellow solid (56 g, 63.1%). MS (m/z): 195.1 (M+H).

Provenance & Evidence