2-(Benzo[d]isoxazol-3-yl)-2-bromoacetic acid → 1,2-Benzisoxazole, 3-(bromomethyl)-

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Reaction Steps

Alpha-bromo-1,2-benzisoxazole-3-acetic acid (58.0 g, 0.23 mole) is suspended in toluene (350 mL) and the mixture is stirred at reflux for 18 hours. The solvent is evaporated and the residue is taken up in methylene chloride (250 mL). This solution is washed with saturated aqueous sodium bicarbonate (2×50 mL), water (50 mL) and dried over anhydrous magnesium sulfate. The solution is filtered and evaporated to afford 3-bromomethyl-1,2-benzisoxazole, m.p. 60°-62° C. The compound is purified by recrystallisation from ether-hexane, m.p. 64°-66° C.

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