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Synthetic studies of neoclerodane diterpenes from Salvia divinorum
Exploration of the 1-position
Holden, KG., Tidgewell, K., Marquam, A., Rothman, RB., Navarro, H., & Prisinzano, TE. (2007). Synthetic studies of neoclerodane diterpenes from Salvia divinorum: Exploration of the 1-position. Bioorganic and Medicinal Chemistry Letters, 17(22), 6111-6115. https://doi.org/10.1016/j.bmcl.2007.09.050
Modification of the C-1 ketone of salvinorin A (2a) produces analogues with opioid antagonist properties. Of particular significance is the finding that 1-deoxo-1,10-dehydrosalvinorin A (11a) is a moderately potent antagonist at all three opioid receptor subtypes, and that herkinorin (2b), a M agonist, is converted to a weak antagonist by removal of the C-1 ketone (3b and 11b). These observations suggest that the ketone of 2b is a key structural feature responsible for M agonist activity.
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