Chloroform → ethyl 5-(bromomethyl)-3-[4-(cyclohexylamino)-1-ethyl-1H-pyrazolo[3,4-b]pyridin-5-yl]-4,5-dihydroisoxazole-5-carboxylate

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Reaktionsschritte

4-(Cyclohexylamino)-1-ethyl-1H-pyrazolo[3,4-b]pyridine-5-carbaldehyde oxime (200 mg, 0.0006 mole) (example 8) was taken in dichloromethane: chloroform mixture (10 ml: 5 ml). Ethyl 2-(bromomethyl)acrylate (0.2 ml, 0.00103 mole) was added. Sodium hypochlorite (2.5 ml) was added drop wise. The reaction mixture was stirred overnight. Water was added, the mixture was extracted with chloroform, washed with brine, dried over anhydrous sodium sulphate and concentrated in vacuo. The crude compound obtained was purified by column chromatography.

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