Triphenylphosphine → 6-isopropyl-2-(3-{5-[1-(2-morpholin-4-ylethyl)-1H-pyrazol-4-yl]pyrimidin-2-yl}benzyl)-2H-pyridazin-3-one

Participants

Reaction Steps

7.2 4.25 g (20.0 mmol) of tripotassium phosphate trihydrate and 842 mg (1.2 mmol) of bis(triphenylphosphine)palladium chloride are added to a solution, kept under nitrogen, of 2.65 g (1.0.0 mol) of [3-(5-bromopyrimidin-2-yl)-phenyl]methanol and 3.38 g (11.0 mmol) of 4-{2-[4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyrazol-1-yl]ethyl}morpholine in 50 ml of 1,2-dimethoxyethane, and the mixture is stirred at 80° C. for 18 hours. Dichloromethane and water are added to the reaction mixture, which is then filtered through kieselguhr, and the residue is washed with dichloromethane. The organic phase is separated off, dried over sodium sulfate and evaporated. The residue is recrystallised from 2-propanot, giving (3-{5-[1-(2-morpholin-4-ylethyl)-1H-pyrazol-4-yl]pyrimidin-2-yl}phenyl)methanol as yellowish crystals; ESI 366. 7.3 A solution, kept under nitrogen, of 324 mg (0.70 mmol) of (3-{5-[1-(2-morpholin-4-ylethyl)-1H-pyrazol-4-yl]pyrimidin-2-yl}phenyl)methanol, 131 mg (0.91 mmol) of 6-isopropyl-2H-pyridazin-3-one and 278 mg (1.05 mmol) of triphenylphosphine in 1.4 ml of THF is cooled in an ice bath, and 217 μl (1.056 mmol) of diisopropyl azodicarboxylate are added dropwise. After the reaction mixture has been stirred at room temperature for 2 hours, it is evaporated. The residue is chromatographed on a silica-gel column with dichloromethane/methanol as eluent, giving 6-isopropyl-2-(3-{5-[1-(2-morpholin-4-ylethyl)-1H-pyrazol-4-yl]pyrimidin-2-yl}benzyl)-2H-pyridazin-3-one (“A13”) as yellowish crystals; ESI 486;

Provenance & Evidence