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| Trade names | Domin |
| Other names | Alefexole |
| AHFS/Drugs.com | International Drug Names |
| Routes of administration | Oral |
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 Y |
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| Chemical and physical data | |
| Formula | C10H15N3S |
| Molar mass | 209.31 g·mol−1 |
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Talipexole (B-HT920, Domnin) is a dopamine agonist that is marketed as a treatment for Parkinson's Disease in Japan by Boehringer Ingelheim; it was introduced in 1996.[1] As of December 2014 it was not approved for marketing in the US nor in Europe.[2]
Talipexole is a D2 dopamine receptor agonist and interacts with both pre- and post-synaptic receptors. It also is an α2-adrenergic agonist.[3]
The main side effects are drowsiness, dizziness, hallucinations and minor gastrointestinal complaints.[3] In Japan, Ministry of Health, Labour and Welfare mandated in 2008 that Boehringer add a warning to the label concerning the risk of sudden onset of sleep.[4]: 15
The N-alkylation of azepan-4-one [105416-56-6] (1) with allyl bromide in the presence of potassium carbonate gives 1-allyl-azepan-4-one (2). This is halogenated with molecular bromine in acetic acid to give 1-allyl-5-bromohexahydro-4-azepinone (3). The last step involves cyclization with thiourea (4) in refluxing ethanol, completing the synthesis of talipexole (5).
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