Diphenyl Ether → (4-hydroxy-1-phenyl-1H-pyrazolo[3,4-b]pyridin-5-yl)(phenyl)methanone

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A mixture of ethyl 2-benzoyl-3-ethoxyacrylate (0.99 g, 4.0 mmol) and 1-phenyl-1H-pyrazol-5-amine (0.64 g, 4.0 mmol) was stirred at 120° C. for 1.5 hr under argon and then cooled. After diphenyl ether (5 g) was added, the mixture was stirred at 240° C. for 2 hr under argon. Flash chromatography and crystallization in heptane and ethyl acetate mixture gave (4-hydroxy-1-phenyl-1H-pyrazolo[3,4-b]pyridin-5-yl)(phenyl)methanone (0.53 g, 1.7 mmol, 42% yield) as a yellow solid.

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