Synthesis and analgesic activity of 3-methyl derivatives of 4-(pyridyl) isosteres of ketobemidone
作者:JK Buolamwini、EE Knaus
DOI:10.1016/0223-5234(92)90065-9
日期:1992.1
A series of cis- and trans-1,3-dimethyl-4-propionyl-4-(pyridyl)piperidines 7 were prepared. Analgesic testing, using the rat 4% NaCl writhing assay, indicated that cis- and trans-7 were generally more potent than the corresponding 3-unsubstituted analogues 2. The point of attachment of the pyridyl ring to the C-4 position was a determinant of activity for the cis-diastereomers 7 where the relative potency order was 2-pyridyl (7a) greater-than-or-equal-to 4-pyridyl (7e) > 3-pyridyl (7c). Compounds 7 possessing cis-(3-Me/pyridyl) substituents were generally more active than the corresponding trans-(3-Me/pyridyl) diastereomer. The most potent compound, cis-1,3-dimethyl-4-propionyl-4-(2-pyridyl)piperidine 7a, inhibited writhing by 82% for a 2 mg/kg sc dose relative to the reference drug meperidine (ED50 = 0.6 mg/kg sc).