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Systematic (IUPAC) name
4,5-α-epoxy- 17-methyl- 6-methylenemorphinan- 3-ol
CAS Number 3414-84-4
PubChem CID 5492874
ChemSpider 4591200
Synonyms 6-MDDM, 6-Methylene- dihydrodesoxymorphine
Chemical data
Formula C18H21NO2
Molar mass 283.36 g/mol[[Script error: No such module "String".]]
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6-Methylenedihydrodesoxymorphine (6-MDDM) is an opiate analogue that is a derivative of hydromorphone, where the 6-ketone group has been replaced by methylene. It has sedative and analgesic effects.

6-Methylenedihydrodesoxymorphine is a potent μ-opioid agonist, 80x stronger than morphine.[1] Compared to morphine it has a faster onset of action and similar duration of effects.[2] It produces around the same degree of respiratory depression as morphine, but less inhibition of gastrointestinal motility. Animal studies show it to be a potent analgesic which produces significant analgesic effects even at low doses which produce comparatively few side effects,[3] however it has never been developed for medical use in humans.

6-Methylenedihydrodesoxymorphine is synthesised in two steps; first a Wittig reaction is used, reacting hydrocodone with methylenetriphenylphosphorane and an alkyl lithium reagent in diethyl ether to form 6-Methylenedihydrodesoxycodeine. The 3-methoxy group is then cleaved to hydroxy, by reaction with pyridine. The second step tends to be incomplete and often gives fairly low yields, but these can be improved by changing the reaction conditions.[4][5]


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  1. Chemistry of Opioid Analgesics PHA 4220 - Neurology Pharmacotherapeutics.
  2. Abdel-Rahman MA, Elliott HW, Binks R, Küng W, Rapoport H. Synthesis and Pharmacology of 6-Methylenedihydrodesoxymorphine. Journal of Medicinal Chemistry. 1966; 9(1):1-6.
  3. Okun R, Elliott HW. Acute Pharmacological Studies of Some New Morphine Derivatives. Journal of Pharmacology And Experimental Therapeutics. 1958; 124(3): 255-259.
  4. Chadha MS, Rapoport H. The Preparation of Some 6-Methylated Dihydrodesoxymorphines. Journal of the American Chemical Society. 1957; 79(21):5730-5734.
  5. Wiegert PE, De La Mater G, McElheny GC, Patterson LA. Physical Constants of 6-Methylenedihydrodesoxymorphine. Journal of Organic Chemistry. 1961; 26(12):5249-5250.