Provided are compounds, processes and synthetic intermediates useful for the preparation of compounds of the formula I and IX ##STR00001## wherein R.sup.1 is selected from the group consisting of hydrogen, trihalomethyl, C.sub.1 C.sub.6 alkyl and substituted or unsubstituted phenyl; Y is a group of the formula ##STR00002## wherein R.sup.2 is selected from the group consisting of C.sub.1 C.sub.6 alkyl, C.sub.1 C.sub.6 alkanoylamino and amino; and R.sup.5 is selected from the group consisting of hydrogen, amino, halogen, hydroxyl, nitro, C.sub.1 C.sub.6 alkyl, C.sub.1 C.sub.6 alkoxy, carboxy, C.sub.1 C.sub.6 trihaloalkyl, cyano, phosphonato, and hydroxyalkyl; and Z is selected from the group consisting of substituted and unsubstituted aryl. Also provided are certain N-acylated analogs of compounds of the formula I and IX, and processes for their preparation.