Hydroxyamine hydrochloride → HCID 13343677, compound

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Reaction Steps

Hydroxylamine hydrochloride (15.19 g, 0.2186 mol.) and (3a) (10.84 g., 0.0322 mol.) were heated at reflux in 75 ml. of dry pyridine for 5 hours. On cooling, the pyridine was removed on a rotary evaporator and chased with ethanol. The residue, a yellow gum, was taken up in ethyl acetate and washed with dilute aqueous hydrochloric acid and brine, then dried over anhydrous magnesium sulfate and evaporated to a gum containing both E and Z isomers of the oxime. Without further purification, the gum was taken up in 20 ml. of absolute ethanol and treated with 120 ml. of 1M alcoholic potassium hydroxide at reflux on a steam bath for 3 hours then refrigerated at 0°-5° C. for 48 hours. The resulting precipitate was collected by filtration, washed with hexane, dried, and dissolved in 300 ml. warm distilled water. Acidification to pH 2.0 by addition of 4.0 M aqueous hydrochloric acid gave a gelatinous precipitate which was extracted into ethyl acetate, dried with anhydrous magnesium sulfate, decolorized with Darco, and evaporated. Recrystallization from ethyl acetate with hexane afforded the furobenzisoxazole (4a) in 32.3% yield, m.p. 214°-215° C. Analysis (C16H10ClNO4) C,H,N,Cl.

Provenance & Evidence