Potassium Phosphate, Tribasic → HCID 66742797, compound

Participants

Reaction Conditions

Reaction Steps

This reaction was carried out under similar conditions to those described above instep 7 of preparation of Example 6. A solution of 6-chloro-4-(5-(4-hydroxy-4-methylpiperidin-1-yl)pyridin-2-ylamino)-2-methylpyridazin-3(2H)-one (150 mg, 429 μmol), 2-(6-tert-butyl-8-fluoro-1-oxophthalazin-2(1H)-yl)-6-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)benzyl acetate (212 mg, 429 μmol), xPhos (20.4 mg, 42.9 μmol) and potassium phosphate (228 mg, 1.07 mmol) in 10 ml of dioxane/water (9:1) was degassed with nitrogen for 10 minutes and bis(dibenzylideneacetone)palladium (0) (12.3 mg, 21.4 μmol) was added. The reaction mixture was heated to 100° C. for 2 hr. After work up, the product was purified by preparative HPLC on silica gel, using a gradient of 0% to 5% methanol/ethyl acetate. This provided 1:1 ratio of desire compound and 2-(6-tert-butyl-8-fluoro-1-oxophthalazin-2(1H)-yl)-6-(5-(5-(4-hydroxy-4-methylpiperidin-1-yl)pyridin-2-ylamino)-1-methyl-6-oxo-1,6-dihydropyridazin-3-yl)benzyl acetate. The reaction mixture was dissolved in methanol (4 ml) and to this was added 2 N NaOH (600 μA). The reaction was stirred at room temperature for 2 h. The methanol was removed by evaporation and the resultant solution was acidified with 1N HCl and extracted with DCM. The resultant organic extract was dried over NaSO4, filtered and concentrated in vacuo. The resultant yellow solid was triturated with ether to afford the desired product as an yellow solid (40 mg, 45.8%). (M+H)+=640.4 m/e. 1H NMR (400 MHz, DMSO-d6) δ ppm 1.14-1.24 (m, 3H) 1.31-1.48 (m, 12H) 1.64 (br. s., 2H) 2.35-2.68 (m, 2H) 3.31 (br. s., 2H) 3.52-3.62 (m, 1H) 4.41 (d, J=11.29 Hz, 2H) 7.33-7.60 (m, 7H) 7.75 (d, J=13.30 Hz, 1H) 7.87 (s, 1H) 8.44 (br. s., 1H) 8.52 (br. s., 1H).

Provenance & Evidence