General Method of Synthesis for Naloxone, Naltrexone, Nalbuphone, and Nalbuphine by the Reaction of Grignard Reagents with an Oxazolidine Derived from Oxymorphone Thebaine is not used for therapeutic or recreational purposes, but is converted industrially into a variety of compounds including oxycodone, oxymorphone, nalbuphine, naloxone, naltrexone, buprenorphine and etorphine. While thebaine is not used therapeutically, it is the main alkaloid extracted from Papaver bracteatum (Iranian poppy) and can be converted industrially into a variety of compounds, including oxycodone, oxymorphone, nalbuphine, naloxone, naltrexone, buprenorphine and etorphine. (−)-Naltrexone, an opioid antagonist used extensively for the management of drug abuse, is derived from naturally occurring opioids. Herein, we report the first asymmetric synthesis of (−)-naltrexone that does not proceed through thebaine. 1062 SHORT PAPER A Simple and Practical Method for the Oxidation of Thebaine to 14-Hydroxycodeinone by V 2 O 5 –H 2 O 2 Oxidation of Thebaine to 14-HydroxycodeinoneSaikat Das Sharma, Dilip Konwar* This short review summarizes our work on the process development for the synthesis of buprenorphine, naltrexone, naloxone, and nalbuphine from naturally occurring opiates such as thebaine and. Synthesis of morphine-like alkaloids in chemistry describes the total synthesis of the natural morphinan class of alkaloids that includes codeine, morphine, oripavine, and thebaine and the closely related semisynthetic analogs buprenorphine, hydrocodone, isocodeine, naltrexone, naloxone, nalbuphine, and oxycodone. (-)-Naltrexone, an opioid antagonist used extensively for the management of drug abuse, is derived from naturally occurring opioids. Herein, we report the first asymmetric synthesis of. Abstract: Activation of Toll-like receptors has been linked to neuropathic pain and opioid dependence. (+)-Naltrexone acts as a Toll-like receptor 4 (TLR4) antagonist and has been shown to reverse neuropathic pain in rat studies.