“…51 Generally, isoxazolium salts (119) on reduction with sodium borohydride in aqueous acetonitrile give 4isoxazolines (120), their borane complexes, 3-isoxazolines (121), isoxazolidines (122), and minor amounts of 3-hydroxypropylamines (123). In some cases, however, particularly if the substituent group at C-3 is aryl and the reaction is carried out in ethanol rather than acetonitrile, the major products are…”