Hydrochloric Acid → 3-Isoxazolamine, 5-(1,1-dimethylethyl)-

Participants

Reaction Steps

To a suspension of cyanopinacolone (75.102 g) in a mixture of anhydrous toluene (150 ml) and anhydrous methanol (26.7 ml) is introduced gaseous hydrogen chloride (26.3 g) with cooling at 5° to 10° C. and stirring, and the whole mixture is allowed to stand at 10° to 12° C. for 23 hours. To the reaction mixture is dropwise added anhydrous methanol (750 ml), then triethylamine (185.178 g) with cooling and stirring to make a complete solution. The reaction mixture is treated with hydroxylamine sulfate (51.704 g) and stirred at 50° C. for 2 hours. Then, conc. hydrochloric acid (112.629 g) is dropwise added to the mixture, which is stirred at 50° C. for 1 hour. After evaporating the solvent under reduced pressure from the reaction mixture, the residue is made alkaline with 48% aqueous sodium hydroxide with cooling, and the aqueous solution is shaken with toluene. The organic layer is washed with water, subjected to azeotropic distillation under atmospheric pressure, and evaporated to dryness to remove the solvent, whereby 3-amino-5-t-butylisoxazole (79.480 g) is obtained. Melting point is 106° to 109° C. Yield is 94.5%.

Provenance & Evidence