Sulfonamides as antifungal agents

A compound of formula Ia:

• ##STR14## in which:
• X is N or CH;
• R.sup.1 is C.sub.1 -C.sub.6 alkyl, C.sub.1 -C.sub.4 haloalkyl, C.sub.3 -C.sub.6 cycloalkyl, phenyl-C.sub.1 -C.sub.4 -alkyl, a phenyl-C.sub.1 -C.sub.4 -alkyl group where the phenyl ring carries a substituent selected from the group consisting of (a) as specified below, phenyl, naphthyl, a phenyl ring substituted with one or more members of group (a), quinolyl, or isoquinolyl,;
• R.sub.4 is hydrogen, C.sub.1 -C.sub.6 alkyl, or (1H-1,2,4-triazol-1-yl)methyl;
• R.sup.5 is hydrogen, C.sub.1 -C.sub.6 alkyl, phenyl or a phenyl group substituted with a member of group (a)
• R.sup.7 is hydrogen or C.sub.1 -C.sub.6 alkyl;
• Ar is phenyl or a phenyl ring substituted with one or more halogen or trifluoromethyl groups;
• wherein group (a) consists of:
• C.sub.1 -C.sub.4 alkyl, C.sub.1 -C.sub.4 haloalkyl, C.sub.1 -C.sub.4 alkoxy, C.sub.1 -C.sub.4 haloalkoxy, halogen, CF.sub.3, NO.sub.2, CN, OH, OCH.sub.2 Ph, CH.sub.2 OH, NHAc, a group of formula --CH.sub.2 --OCO--R.sup.6, a group of formula --CO--R.sup.6, a group of formula --COO-- R.sup.6, a group of formula --SO.sub.z R.sup.6, NH.sub.2, NHR.sup.6, or NR.sup.6.sub.2 ;
• R.sup.6 is C.sub.1 -C.sub.4 alkyl;
• Z is 0, 1 or 2;
• or an acid-addition salt thereof.