(1-Methyl-1H-imidazol-5-yl)(pyridin-2-yl)methanol → (1-Methyl-1H-imidazol-5-yl)(pyridin-2-yl)methanone

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A heterogenous mixture of (1-methyl-1H-imidazol-5-yl)(pyridin-2-yl)methanol (1.41 g, 7.45 mmol, Intermediate 33: step a) and manganese dioxide (3.24 g, 37.27 mmol) in 1,4-dioxane (52 mL) was stirred at 100° C. for 2 hours. The reaction mixture was then cooled to room temperature, filtered through Celite®, washed with DCM, and concentrated to provide the title compound as an off-white solid.

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