Piritramide(R-3365, trade names Dipidolor, Piridolan, Pirium and others) is a synthetic

opioid Opioids are substances that act on opioid receptors to produce morphine-like effects. Medically they are primarily used for pain relief, including anesthesia. Other medical uses include suppression of diarrhea, replacement therapy for opioi ...

analgesic An analgesic drug, also called simply an analgesic (American English), analgaesic (British English), pain reliever, or painkiller, is any member of the group of drugs used to achieve relief from pain (that is, analgesia or pain management). It ...

(narcotic painkiller) that is marketed in certain

Europe Europe is a large peninsula conventionally considered a continent in its own right because of its great physical size and the weight of its history and traditions. Europe is also considered a subcontinent of Eurasia and it is located enti ...

an countries including:

Austria Austria, , bar, Östareich officially the Republic of Austria, is a country in the southern part of Central Europe, lying in the Eastern Alps. It is a federation of nine states, one of which is the capital, Vienna, the most populous ...

Belgium Belgium, ; french: Belgique ; german: Belgien officially the Kingdom of Belgium, is a country in Northwestern Europe. The country is bordered by the Netherlands to the north, Germany to the east, Luxembourg to the southeast, France to ...

Czech Republic The Czech Republic, or simply Czechia, is a landlocked country in Central Europe. Historically known as Bohemia, it is bordered by Austria to the south, Germany to the west, Poland to the northeast, and Slovakia to the southeast. Th ...

Slovenia Slovenia ( ; sl, Slovenija ), officially the Republic of Slovenia (Slovene: , abbr.: ''RS''), is a country in Central Europe. It is bordered by Italy to the west, Austria to the north, Hungary to the northeast, Croatia to the southeast, and ...

Germany Germany, officially the Federal Republic of Germany (FRG),, is a country in Central Europe. It is the most populous member state of the European Union. Germany lies between the Baltic and North Sea to the north and the Alps to the sou ...

and the

Netherlands ) , anthem = ( en, "William of Nassau") , image_map = , map_caption = , subdivision_type = Sovereign state , subdivision_name = Kingdom of the Netherlands , established_title = Before independence , established_date = Spanish Netherl ...

. It comes in free form, is about 0.75x times as potent as

morphine Morphine is a strong opiate that is found naturally in opium, a dark brown resin in poppies ('' Papaver somniferum''). It is mainly used as a pain medication, and is also commonly used recreationally, or to make other illicit opioids. Ther ...

and is given parenterally (by injection) for the treatment of severe pain. Nausea, vomiting, respiratory depression and constipation are believed to be less frequent with piritramide than with

(the gold standard opioid against which other opioids are compared and contrasted), and it produces more rapid-onset analgesia (pain relief) when compared to morphine and

pethidine Pethidine, also known as meperidine and sold under the brand name Demerol among others, is a synthetic opioid pain medication of the phenylpiperidine class. Synthesized in 1938 as a potential anticholinergic agent by the German chemist Otto Ei ...

. After intravenous administration the onset of analgesia is as little as 1–2 minutes, which may be related to its great

lipophilicity Lipophilicity (from Greek λίπος "fat" and φίλος "friendly"), refers to the ability of a chemical compound to dissolve in fats, oils, lipids, and non-polar solvents such as hexane or toluene. Such non-polar solvents are themselves lipo ...

. The analgesic and sedative effects of piritramide are believed to be potentiated with phenothiazines and its emetic (nausea/vomiting-inducing) effects are suppressed. The

volume of distribution In pharmacology, the volume of distribution (VD, also known as apparent volume of distribution, literally, ''volume of dilution'') is the theoretical volume that would be necessary to contain the total amount of an administered drug A drug ...

is 0.7-1 L/kg after a single dose, 4.7-6 L/kg after steady-state concentrations are achieved and up to 11.1 L/kg after prolonged dosing. Piritramide was developed and patented in Belgium, at Janssen, in 1960. It is part of an eponymous two-member class of opioids in clinical use with the other being bezitramide (Burgodin). The closest chemical and structural relatives of piritramide in clinical use include the

diphenoxylate Diphenoxylate is a centrally active opioid drug of the phenylpiperidine series that is used as a combination drug with atropine for the treatment of diarrhea. Diphenoxylate is an opioid and acts by slowing intestinal contractions; the atropin ...

family,

fentanyl Fentanyl, also spelled fentanil, is a very potent synthetic opioid used as a pain medication. Together with other drugs, fentanyl is used for anesthesia. It is also used illicitly as a recreational drug, sometimes mixed with heroin, cocaine ...

(both Janssen discoveries) and somewhat more distantly

alphaprodine Prodine (trade names Prisilidine and Nisentil) is an opioid analgesic that is an analog of pethidine (meperidine). It was developed in Germany in the late 1940s. There are two isomers of the trans form of prodine, alphaprodine and betaprodine. ...

. Not being in clinical use in the United States, it is a Schedule I Narcotic controlled substance with a DEA ACSCN of 9642 and manufacturing quota of zero.

Synthesis

*This same sidechain is also used in the synthesis of: Bezitramide,

Diphenoxylate Diphenoxylate is a centrally active opioid drug of the phenylpiperidine series that is used as a combination drug with atropine for the treatment of diarrhea. Diphenoxylate is an opioid and acts by slowing intestinal contractions; the atropin ...

Imidafenacin Imidafenacin (INN) is a urinary antispasmodic of the anticholinergic class. Pharmacol: Synthesis *The sidechain is a versatile precursor also used in the synthesis of: Bezitramide, Piritramide, Diphenoxylate, & others. The alkylation of Diphen ...

& others. *This same piperidine is also used in the synthesis of:

Carpipramine Carpipramine (Prazinil, Defekton) is an atypical antipsychotic used for the treatment of schizophrenia and anxiety in France and Japan. In addition to its neuroleptic and anxiolytic effects, carpipramine also has hypnotic properties. It is stru ...

Clocapramine Clocapramine (Clofekton, Padrasen), also known as 3-chlorocarpipramine, is an atypical antipsychotic of the iminodibenzyl class which was introduced in Japan in 1974 by Yoshitomi for the treatment of schizophrenia. In addition to psychosis, cl ...

, Mosapramine & Pipamperone. Piritramide synthesis

The last step in the synthesis consists of attachment of the sidechain by an Sn2 alkylation between 4-bromo-2,2-diphenylbutanenitrile 9186-58-8(1) and 1,4'-bipiperidine-4'-carboxamide 9633-82-4(2) catalyzed by KI (

Finkelstein reaction The Finkelstein reaction named after the German chemist Hans Finkelstein, is an SN2 reaction (Substitution Nucleophilic Bimolecular reaction) that involves the exchange of one halogen atom for another. It is an equilibrium reaction, but the rea ...

) in the presence of sodium carbonate base and in anhydrous toluene solvent yielding ' (3)..

References

{{Opioidergics Opioids Piperidines Carboxamides Nitriles Mu-opioid receptor agonists Janssen Pharmaceutica Belgian inventions