Structure-activity studies of morphine fragments. III. Synthesis, opiate receptor binding, analgetic activity and conformational studies of spiro-[tetralin-1,4′-piperidines]
摘要:
A series of 5 spiro compounds, a new class of conformationally restricted analogs of 4-alkyl-4-(m-OH-phenyl) piperidines, have been synthesized and their affinities for mu, delta and kappa-opioid receptor sites and in vivo analgetic activities determined. All compounds show rather low affinities for the 3 receptors, with some modulation by the N-substituent and by the position of the phenolic group. To help understand the origin of this poor affinity compared to the unrestricted 4-alkyl-4-phenyl piperidines, energy conformation calculations were performed which indicated that all the analogs favor a phenyl equatorial over a phenyl axial conformer. Significant differences in the lowest energy conformation were found between these spiro analogs and both morphine and 4-n-propyl-4-(m-OH-phenyl) piperidines, 18 and 19 which are conformationally unrestricted, closely related analogs with high mu-affinity. These differences could account for their lower affinities. To continue the search for more active members of the family, structure variations which favor a phenyl-axial conformation have been identified and proposed for further study.
Structure-activity studies of morphine fragments. III. Synthesis, opiate receptor binding, analgetic activity and conformational studies of spiro-[tetralin-1,4′-piperidines]
作者:JA Lawson、L Toll、W Polgar、ET Uyeno、GH Loew
DOI:10.1016/0223-5234(91)90003-6
日期:1991.11
A series of 5 spiro compounds, a new class of conformationally restricted analogs of 4-alkyl-4-(m-OH-phenyl) piperidines, have been synthesized and their affinities for mu, delta and kappa-opioid receptor sites and in vivo analgetic activities determined. All compounds show rather low affinities for the 3 receptors, with some modulation by the N-substituent and by the position of the phenolic group. To help understand the origin of this poor affinity compared to the unrestricted 4-alkyl-4-phenyl piperidines, energy conformation calculations were performed which indicated that all the analogs favor a phenyl equatorial over a phenyl axial conformer. Significant differences in the lowest energy conformation were found between these spiro analogs and both morphine and 4-n-propyl-4-(m-OH-phenyl) piperidines, 18 and 19 which are conformationally unrestricted, closely related analogs with high mu-affinity. These differences could account for their lower affinities. To continue the search for more active members of the family, structure variations which favor a phenyl-axial conformation have been identified and proposed for further study.