Effect of the 3- and 4-Methyl Groups on the Opioid Receptor Properties of N-Substituted <i>trans</i>-3,4-Dimethyl-4-(3-hydroxyphenyl)piperidines
作者:Chad M. Kormos、Juan Pablo Cueva、Moses G. Gichinga、Scott P. Runyon、James B. Thomas、Lawrence E. Brieaddy、S. Wayne Mascarella、Brian P. Gilmour、Hernán A. Navarro、F. Ivy Carroll
DOI:10.1021/jm500184j
日期:2014.4.10
N-substituted trans-3,4-dimethy1-4-(3-hydroxyphenyOpiperidines (2a,b) are opioid receptor antagonists where the antagonist properties are not due to the type of N-substituent. In order to gain a better understanding of the contribution that the 3- and 4-methyl groups make to the pure antagonist properties of 2a,b, we synthesized analogues of 2a,b that lacked the 4-methyl (5a,b), 3-methyl (6a,b), and both the 3- and 4-methyl group (7a,b) and compared their opioid receptor properties. We found that (1) all N-methyl and N-phenylpropyl substituted compounds were nonselective opioid antagonists (2) all N-phenylpropyl analogues were more potent than their N-methyl counterparts, and (3) compounds 2a,b which have both a 3- and 4-methyl substituent, were more potent antagonists than analogues 5a,b, 6a,b, and 7a,b. We also found that the removal of 3-methyl substituent of N-methyl and N-phenylpropyl 3-methyl-4-(3-hydroxyphenyl)piperazines (8a,b) gives (4a,b), which are opioid antagonists.