m-Chloroperbenzoic acid → 3-(Pyridin-3-yloxy)-4,5-dihydroisoxazole

Participants

Reaction Steps

Racemic 3-(pyrimidin-5-yloxy)-4,5-dihydroisoxazole I-132 was dissolved in methylene chloride (0.5 M with respect to isoxazole) after which point m-chloroperbenzoic acid (2.0 equiv) was added in 1 portion and the reaction was allowed to stir at room temperature for 1 h. After the reaction was determined to be complete by LC/MS, the solvent was evaporated. The crude mixture was then redissolved in tert-butylmethyl ether (0.5 M) after which hexane was slowly added until a solid precipitated. The solid was then collected via vacuum filtration and washed with 1:1 hexanes/tert-butylmethyl ether to provide the desired 3-(pyridin-3-yloxy)-4,5-dihydroisoxazole I-133a and I-133b as a white solid. These compounds can be separated using chiral HPLC methods known in the art. For example, see chiral HPLC Method disclosed herein. [M+H]+=404.1 m/z. Activity: A

Provenance & Evidence