|Systematic (IUPAC) name|
|Mol. mass||191.229 g/mol|
|Melt. point||170–172 °C (338–342 °F)|
AL-34662 is an indazole derivative drug that is being developed for the treatment of glaucoma. It acts as a selective 5-HT2A receptor agonist, the same target as that of psychedelic drugs like psilocin, but unlike these drugs, AL-34662 was designed specifically as a peripherally selective drug, which does not cross the blood–brain barrier. This means that AL-34662 can exploit a useful side effect of the hallucinogenic 5-HT2A agonists, namely reduction in intra-ocular pressure and hence relief from the symptoms of glaucoma, but without causing the hallucinogenic effects that make centrally active 5-HT2A agonists unsuitable for clinical use. In animal studies, AL-34662 has been shown to be potent and effective in the treatment of symptoms of glaucoma, with minimal side effects.
Peripherally acting 5-HT2A agonists have been a rich field of research in recent years, with potential glaucoma treatments being the main proposed application for 5-HT2A agonists at present, as centrally acting agonists for this receptor tend to be hallucinogenic and thus have little medical use. While many novel, potent and selective 5-HT2A agonists have been developed for this application, retaining peripheral selectivity can be a problem, and several of the more lipophilic compounds closely related to AL-34662 such as those shown below, did cross the blood–brain barrier and produced hallucinogen-appropriate responding in animals.
- Sharif, NA; Kelly, CR; Crider, JY; Davis, TL (2006). "Serotonin-2 (5-HT2) receptor-mediated signal transduction in human ciliary muscle cells: role in ocular hypotension". Journal of Ocular Pharmacology and Therapeutics 22 (6): 389–401.
- Sharif, NA; McLaughlin, MA; Kelly, CR (2007). "AL-34662: a potent, selective, and efficacious ocular hypotensive serotonin-2 receptor agonist". Journal of Ocular Pharmacology and Therapeutics 23 (1): 1–13.
- May, JA; Chen, HH; Rusinko, A; Lynch, VM; Sharif, NA; McLaughlin, MA (2003). "A novel and selective 5-HT2 receptor agonist with ocular hypotensive activity: (S)-(+)-1-(2-aminopropyl)-8,9-dihydropyrano3,2-eindole". Journal of Medical Chemistry 46 (19): 4188–95.
- Jesse A. May, Paul W. Zinke. 5-Hydroxyl indole derivatives for treating glaucoma. US Patent 6806285
- Jesse A. May, Zixia Feng, Anura P. Dantanarayana. 6-hydroxy-indazole derivatives for treating glaucoma. US Patent 6956036
- Jesse A. May, Anura P. Dantanarayana. Fused indazoles and indoles and their use for the treatment of glaucoma. US Patent 6960608
- Jesse A. May, Zixia Feng. 5-Hydroxy indazole derivatives for treating glaucoma. US Patent 7005443
- Zixia Feng, Mark R. Hellberg. Benzodifuranimidazoline and benzofuranimidazoline derivatives and their use for the treatment of glaucoma. US Patent 7208512.
- Anura P. Dantanarayana, Jesse Albert May. Substituted (1,4)oxazino(2,3-g)indazoles for the treatment of glaucoma. US Patent 7268131
- Anura P. Dantanarayana, Jesse A. May. Substituted 1-alkylamino-1H-indazoles for the treatment of glaucoma. US Patent 7338972
- May, JA; Dantanarayana, AP; Zinke, PW; McLaughlin, MA; Sharif, NA (2006). "1-((S)-2-aminopropyl)-1H-indazol-6-ol: a potent peripherally acting 5-HT2 receptor agonist with ocular hypotensive activity". Journal of Medical Chemistry 49 (1): 318–28.