Tasimelteon is extensively metabolized. Metabolism of tasimelteon consists primarily of oxidation at multiple sites and oxidative dealkylation resulting in opening of the dihydrofuran ring followed by further oxidation to give a carboxylic acid. CYP1A2 and CYP3A4 are the major isozymes involved in the metabolism of tasimelteon. Phenolic glucuronidation is the major phase II metabolic route.
In several clinical trials, tasimelteon was found to be well tolerated. Serum enzyme elevations occurred in up to 10% of tasimelteon treated patients compared to 5% of placebo controls, but instances of clinically apparent liver injury were not reported. In a combined analysis of 6 trials of tasimelteon given for an average of 1 year, ALT elevations above 3 times the ULN arose in 6.5% of tasimelteon treated subjects, but no elevations were above 10 times ULN, and none were associated with symptoms or jaundice. Most elevations were single values and resolved spontaneously without dose reduction or discontinuation. Tasimelteon has been available for a limited period of time, but has not been linked to instances of clinically apparent liver injury. Tasimelteon is metabolized by the cytochrome P450 system (predominantly CYP 1A2 and CYP3A4), which can result in significant drug-drug interactions, strong inhibitors of the enzymes increasing serum concentrations of tasimelteon and strong inducers decreasing them.
Likelihood score: E (unlikely cause of clinically apparent liver injury).
Drug Class: Sedatives and Hypnotics
Other Drugs in the Subclass, Melatonin and its Analogues: Melatonin, Ramelteon
◉ Summary of Use during Lactation:No information is available on the use of tasmelteon during breastfeeding. Monitor the infant for drowsiness and adequate feeding, especially while nursing a newborn or preterm infant. Until more data become available an alternate drug may be preferred.
◉ Effects in Breastfed Infants:Relevant published information was not found as of the revision date.
◉ Effects on Lactation and Breastmilk:Relevant published information was not found as of the revision date.
来源:Drugs and Lactation Database (LactMed)
毒理性
蛋白质结合
在治疗浓度下,tasimelteon约有90%与蛋白质结合。
At therapeutic concentrations, tasimelteon is about 90% bound to proteins.
Following oral administration of radiolabeled tasimelteon, 80% of total radioactivity was excreted in urine and approximately 4% in feces, resulting in a mean recovery of 84%. Less than 1% of the dose was excreted in urine as the parent compound.
来源:DrugBank
吸收、分配和排泄
分布容积
在年轻健康受试者中,tasimelteon在稳态下的表观口服分布体积大约为56 - 126升。
The apparent oral volume of distribution of tasimelteon at steady state in young healthy subjects is approximately 56 - 126 L.
[EN] PROCESS FOR THE PREPARATION OF ENANTIOMERICALLY ENRICHED DIHYDROBENZOFURANS AND INTERMEDIATE COMPOUNDS OBTAINED IN THE PROCESS<br/>[FR] PROCÉDÉ DE PRÉPARATION DE DIHYDROBENZOFURANES ENRICHIS DE MANIÈRE ÉNANTIOMÉRIQUE ET COMPOSÉS INTERMÉDIAIRES OBTENUS DURANT LE PROCÉDÉ
申请人:QUIM SINTETICA S A
公开号:WO2018149940A1
公开(公告)日:2018-08-23
It is described an industrially viable and advantageous process for the preparation of (N- (((1R,2R)-2-(2,3-dihydrobenzofuran-4-yl)cyclopropyl)methyl)propionamide, compound having the formula depicted below and generally known as Tasimelteon, or of intermediates useful in the synthesis thereof: The invention also relates to salts obtained as intermediates of the process.
This invention relates to novel 1,2-benzisoxazol-3-yl compounds, their derivatives, pharmaceutically acceptable salts, solvates, and hydrates thereof. This invention also provides compositions comprising a compound of this invention and the use of such compositions in methods of treating diseases and conditions that are beneficially treated by administering an antagonist of both dopamine and serotonin receptors.
Processes for the Preparation of Tasimelteon and Intermediates Thereof
申请人:Apotex Inc.
公开号:US20170355688A1
公开(公告)日:2017-12-14
The present invention provides processes for the preparation of Tasimelteon (1), as well as processes for the preparation of intermediates of Formulas (2), (3) and (4) useful in the preparation of Tasimelteon (1).