Potassium Phosphate, Tribasic → (S)-1-(2-amino-2'-(pyridin-3-yl)-5H-spiro[oxazole-4,9'-xanthene]-7'-yl)-4-hydroxybutan-1-one

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A 2-5 ml microwave vial was charged with (S)-2′-bromo-7′-(pyridin-3-yl)-5H-spiro[oxazole-4,9′-xanthen]-2-amine (96 mg, 0.235 mmol), potassium phosphate (150 mg, 0.705 mmol), 2-(4,5-dihydrofuran-2-yl)-4,4,5,5-tetramethyl-1,3,2-dioxaborolane (92 mg, 0.470 mmol) and AmPhos (16.65 mg, 0.024 mmol). 1,4-Dioxane (1176 μL) and water (392 μL) were added and the vial was sealed and heated in microwave reactor for 1 hr at 100° C. The mixture was diluted with ethyl acetate, filtered through celite, and concentrated on 2 g of silica gel. Purification by flash chromatography on 12 g rediSep column using 5-50% gradient of DCM/MeOH/NH4OH (90:10:1) in DCM provided (S)-1-(2-amino-2′-(pyridin-3-yl)-5H-spiro[oxazole-4,9′-xanthene]-7′-yl)-4-hydroxybutan-1-one as an off-white solid.

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