Abstract
2,4,5-Trimethylpyrrole-3-carboxylic acid esters of tropanols and related monocyclic amino alcohols were synthesized and evaluated for analgesic activity [in monkeys] by the mouse hot-plate and Nilsen methods. 1-Methyl-4-piperidinol 4-(2,4,5-trimethylpyrrole-3-carboxylate) (7) exhibited activity in the morphine-codeine range (mouse hot plate). 4-Piperidinol ester 7 acted neither as a typical narcotic agonist nor as a typical antagonist and showed no physical dependence liability of the morphine-type. Pethidine and prodine analgesics have quaternary phenyl substitution at C-4 of the piperidine ring; compound 7 does not.