5,5-disubstituted-3-phenyl-3-phenyl-3-[(1H-imidazol-1-ylmethyl) or (1H-1,2,4-triazol-1-ylmethyl)]-2-methylisoxazolidine derivatives (IR 3012)

A compound of the formula:

• ##STR4## and the pharmaceutically acceptable acid addition salts thereof, in the form of their enantiomers or mixture of their enantiomers including diastereomeric pairs of such enantiomers,
• wherein;
• a=1 or 2,
• R.sup.1 is selected from hydrogen, halogen, lower alkyl and lower alkoxy groups and combinations thereof, provided that the ortho position is hydrogen,
• R.sup.2 is selected from lower alkyl, phenyl, substituted phenyl and alkoxycarbonyl groups and R.sup.3 is selected from lower alkyl, phenyl and substituted phenyl groups, wherein the phenyl substituents are selected from one to three of halogen, lower alkyl, and lower alkoxy groups and combinations thereof, and
• X is selected from CH or N.