Synthesis and biological screening of 4-(1-pyrrolidinyl) piperidine derivatives as effective analgesics

A variety of 4(1-pyrrolidinyl) piperidine analogs 2 - 6 with variable substituents on phenyl ring of phenacyl moiety were synthesized and evaluated for their analgesic inhibitory potential by tail flick method revealed significant analgesic activity. the synthetic compounds exhibit analgesic inhibitory potential was ranging from significant to highly significant activity. compounds were evaluated by thermal stimuli (tail immersion method) at the dose of 50 mg/kg of body weight. the compounds 2 - 5 showed significant and highly significant analgesic activity. pethidine was used as reference drug. same compounds tested at the dose of 75mg/kg of body weight showed toxicity. the size of the substituent,electron donating or withdrawing affect of substituents as well as the position of substituent on phenyl ring affected the activity. these compounds could be considered to develop a new class of analgesics.