Hydroxyamine hydrochloride → 4-(3H-imidazo[4,5-c]pyridin-2-yl)-fluoren-9-one oxime

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Reaction Steps

In a 500-ml three-necked flask, dissolve 20 g of 4-(3H-imidazo[4,5-c]pyridin-2-yl)-fluoren-9-one, obtained in Example 1, in 328 ml of ethanol, then add successively 14.02 g of hydroxylamine hydrochloride and 27.59 g of dry sodium acetate. After stirring overnight at room temperature, dilute with 328 ml of water. The precipitate that formed is drained, washed with water and dried in the stove at 500. In this way we obtain 18.6 g of equimolecular mixture of the Z and E oximes of 4-(3H-imidazo[4,5-c]pyridin-2-yl)-fluoren-9-one, in the form of a pale yellow powder, witH-NMR purity over 95%, with the following characteristics:

Provenance & Evidence