Hydroxyamine hydrochloride → 3-(3,3-Dimethyl-1-oxo-isochroman-4-yl)-3H-imidazole-4-carbaldehyde Oxime

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Reaction Steps

3-(3,3-Dimethyl-1-oxo-isochroman-4-yl)-3H-imidazole-4-carbaldehyde (0.100 g, 0.363 mmol) (Example 9a) in ethanol (3 mL) is added to NaHCO3 (0.246 g, 2.901 mmol) and hydroxylamine hydrochloride (0.208 g, 2.901 mmol) in water (1 mL). After 1 hr, water is added and the mixture is extracted three times with dichloromethane. The combined organic phase is dried over magnesium sulfate and filtered through a cotton plug. Concentration in vacuo gives a residue, which is purified by silica gel flash chromatography (elution with dichloromethane-methanol, 49:1), resulting in the separation of the two isomers. Each isomer is obtained as a white solid.

Provenance & Evidence