| abstract |
The derivatives have the formulan n wherein R 1 and R2 are each independently selected from the group consisting of hydrogen; alkyl; alkenyl; cycloalkyl; cycloalkyl alkyl; cycloalkenyl; cycloalkenylalkyl; alkylcycloalkyl; alkenylcycloalkyl; alkylcycloalkenyl; phenyl; 5- and 6- membered heterocyclic wherein the heteroatom is nitrogen, oxygen, or sulfur; and said heterocyclic attached through C 1-2 alkyl; R 3 and R 4 are each independently hydrogen or lower alkyl; R s is hydrogen, alkyloxymethyl, alkylamino, aralkylamino, N-substituted carboxamido, or aralkyloxy methyl in which the N substituent is benzyl, phenylethyl, or phenylpropyl; and n is 1 or 2. |