Potassium Phosphate, Tribasic → 1-[5-(1,3-dihydro-1-oxo-5-isobenzofuranyl)-8-methoxy[1,2,4]triazolo[1,5-a]pyridin-2-yl]Cyclopropanecarboxylic acid

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1-(5-Bromo-8-methoxy-[1,2,4]triazolo[1,5-a]pyridin-2-yl)cyclopropanecarboxylic acid (1.00 g, 3.20 mmol) and 5-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-3H-isobenzofuran-1-one (preparation of the boronate was described in WO2011/134468) (1.67 g, 6.40 mmol) were dissolved in degassed dioxane (16 mL). Pd2(dba)3 (29 mg, 32 μmol), PCy3 (18 mg, 64 μmol) and K3PO4 (2.38 g, 11.2 mmol) were mixed in degassed water (10 mL). The two solutions were mixed and subsequently heated in a micro wave oven to 110° C. for 10 minutes, cooled to room temperature and diluted with EtOAc (40 mL). The organic phase was extracted with water (25 mL) and an aqueous 0.1 M solution of NaOH (25 mL) and the combined aqueous phases were acidified with conc. HCl to pH 0-1, and extracted with DCM (30 mL×4). Upon evaporation of the combined organic phases the title compound crystallized out (746 mg, 64%). HPLC-Retention time (XE Metode 7 CM): 1.97 minutes. Detected “M+1”-mass: 366.11. Calculated “M+1”-mass: 366.11. 1H NMR (DMSO, 300 MHz): δ=8.25-8.20 (m, 1H), 8.13 (dd, 1H, J=8.2, 1.4 Hz), 8.00 (d, 1H, J=8.0 Hz), 7.40 (d, 1H, J=8.2 Hz), 7.24 (d, 1H, J=8.3 Hz), 5.51 (s, 2H), 4.04 (s, 3H), 1.58-1.48 (m, 2H), 1.48-1.39 (m, 2H) ppm.

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