Synthesis and Evaluation of Potentially Transdermal Morphine Derivatives
Jacqui F. Young A , Neeranat Thienthong A , Milton T. W. Hearn A , Andrea J. Robinson A and W. Roy Jackson A BA Centre for Green Chemistry, Monash University, Clayton, Vic. 3800, Australia.
B Corresponding author. Email: roy.jackson@monash.edu
Australian Journal of Chemistry 64(10) 1339-1345 https://doi.org/10.1071/CH11029
Submitted: 17 January 2011 Accepted: 16 May 2011 Published: 23 August 2011
Abstract
Three new morphine-based compounds bearing arginyl moieties, compounds 7, 9a, and 9b, have been synthesized using solid phase and solution phase techniques with the aim of obtaining new transdermal analgesics. Preliminary biological assays have shown that these compounds have a relatively high affinity for opioid receptors, achieving ≥94 % inhibition of radioligand binding at a concentration of 10 µM in non-selective opioid binding assays. Further testing on two of the analogues, 9a and 9b, demonstrated that these compounds were acting as agonists, rather than antagonists, at the opioid receptors and 9b achieved the significant result of 73 % inhibition of contractile responses in the electrically stimulated guinea pig ileum assay at a concentration of 30 µM. Unfortunately, none of the molecules showed evidence of transdermal activity.
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