Phosphoric Acid → 2-{(8R)-3-[6-methoxy-5-(4-methyl-1H-imidazol-1-yl)pyridin-2-yl]-8-(3,4,5-trifluorophenoxy)-5,6,7,8-tetrahydro[1,2,4]triazolo[4,3-a]pyridin-8-yl}propan-2-ol monophosphate

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To a mixture of 2-{(8R)-3-[6-methoxy-5-(4-methyl-1H-imidazol-1-yl)pyridin-2-yl]-8-(3,4,5-trifluorophenoxy)-5,6,7,8-tetrahydro[1,2,4]triazolo[4,3-a]pyridin-8-yl}propan-2-ol (1.0 g) in 2-propanol (4 mL) was added a mixture of phosphoric acid (0.27 g) in 2-propanol (2 mL) at 50° C., and the mixture was stirred for 30 min. To the reaction mixture was added IPE (6 mL) at 50° C., and the mixture was stirred for 30 min. To the reaction mixture was added IPE (2 mL) at room temperature, and the mixture was stirred for 30 min. The crystals were collected by filtration, washed with IPE (2 mL) and dried to give the title compound (1.08 g).

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