Analgesic Grayanane-Derived Diterpenoids from the Flowers of Rhododendron molle

Le résumé fourni par la source

Ten new grayanane-derived diterpenoids, rhodomollein LVII–LXVI ( 1 – 10 ), along with the known compound rhodomollein XLIII ( 11 ), were isolated from the flowers of Rhododendron molle . Their structures were elucidated by detailed spectroscopic analysis, X-ray diffraction crystallography, and ECD calculations. Rhodomollein LVII–LIX ( 1 – 3 ) are the first-discovered 3- O - (E) - p -coumaroylquinic acid, nicotinic acid, and 2-furoic acid derivatives of grayanane diterpenoids, respectively. In an acetic acid-induced writhing test, compounds 1 and 3 demonstrated significant antinociceptive effects with writhing inhibition rates of 77.2% and 71.5%, respectively, at a dose of 0.2 mg/kg. Compound 1 was found to be twice as potent as morphine, exhibiting significantly lower toxicity (LD 50 = 130.90 mg/kg, i.p.) compared to rhodojaponin VI (LD 50 = 1.79 mg/kg, i.p.).

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