Potassium Acetate → 1-(4-(2-Hydroxy-2-methylpropoxy)-3-methoxyphenyl)-2-oxo-1,2-dihydropyridin-4-ylboronic acid

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Reaktionsschritte

A mixture of 4-chloro-1-(4-(2-hydroxy-2-methylpropoxy)-3-methoxyphenyl)pyridin-2(1H)-one Part D of procedure 9 (300 mg, 0.93 mmol), 4,4,4′, 4′,5,5,5′,5′-octamethyl-2,2′-bi(1,3,2-dioxaborolane) (706 mg, 2.78 mmol), potassium acetate (273 mg, 2.78 mmol), TRIS(DIBENZYLIDENEACETONE)-DIPALLADIUM(0)-CHLOROFORM ADDUCT (67 mg, 0.06 mmol), and X-Phos (133 mg, 0.28 mmol) in Dioxane (6 mL) was stirred at 90° C. for 18 hours (Mullen et al, JOC, 2008, 73 (23) 9207-9213). The reaction was filtered and concentrated. The crude was purified using ISCO flash chromatography (silica gel/methylene chloride/methanol 100:0 to 90:10 gradient) to afford the desired product 1-(4-(2-hydroxy-2-methylpropoxy)-3-methoxyphenyl)-2-oxo-1,2-dihydropyridin-4-ylboronic acid 12A (112 mg, 0.336 minol, 36.3% yield) as a brown solid. LC/MS 334 (M+H)+, tR 0.59 min (method 5)

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