| Abstract: | A compound of the structure ##STR00001## wherein R.sup.1 and R.sup.2 are each, independently, hydrogen or --CO(CR.sup.3R.sup.4).sub.b(CR.sup.5R.sup.6).sub.dCR.sup.7R.sup.8R.sup.9; R.sup.3 and R.sup.4 are each, independently, hydrogen, alkyl, alkenyl, alkynyl, trifluoromethyl, or --F; R.sup.5 and R.sup.6 are each, independently, hydrogen, alkyl, alkenyl, alkynyl, --(CR.sup.3R.sup.4).sub.fOR.sup.10, --CF.sub.3, --F, or --CO.sub.2R.sup.11, or R.sup.5 and R.sup.6 may be taken together to form X or a cycloalkyl ring that is optionally mono-, di-, or tri-substituted with --(CR.sup.3R.sup.4).sub.fOR.sup.10; R.sup.7 is hydrogen, alkyl, alkenyl, alkynyl, --(CR.sup.3R.sup.4-).sub.fOR.sup.10, --CF.sub.3, --F, or CO.sub.2R.sup.11; R.sup.8 and R.sup.9 are each, independently, hydrogen, alkyl, alkenyl, alkynyl, --(CR.sup.3R.sup.4).sub.fOR.sup.10, --CF.sub.3, --F, or --CO.sub.2R.sup.11, or R.sup.8 and R.sup.9 may be taken together to form X or a cycloalkyl ring that is optionally mono-, di-, or tri-substituted with --(CR.sup.3R.sup.4-).sub.fOR.sup.10; R.sup.10 is hydrogen, alkyl, alkenyl, alkynyl, tri-(alkyl)silyl, tri-(alkyl)silylethyl, triphenylmethyl, benzyl, alkoxymethyl, tri-(alkyl)silylethoxymethyl, chloroethyl, or tetrahydropyranyl; R.sup.11 is hydrogen, alkyl, alkenyl, alkynyl, or phenylalkyl; X is 5-(2,2-dialkyl)[1,3]dioxanyl, 5-(2,2-dicycloalkyl)[1,3]dioxanyl, 4-(2,2-dialkyl)[1,3]dioxanyl, 4-(2,2-dicycloalkyl)[1,3]dioxanyl, 4-(2,2dialkyl)[1,3]dioxalanyl, or 4-(2,2-dicycloalkyl)[1,3]dioxalanyl; b=0-6; d=0-6; and f=0-6 with the proviso that R.sup.1 and R.sup.2 are both not hydrogen and further provided that either R.sup.1 or R.sup.2 contains at least one --(CR.sup.3R.sup.4).sub.fOR.sup.10, X, or --(CR.sup.3R.sup.4).sub.fOR.sup.10 substituted cycloalkyl group, or a pharmaceutically acceptable salt thereof which is useful as an immunosuppressive, antiinflammatory, antifungal, antiproliferative, and antitumor agent. |
