September 6, 2025 2:30 pm
Ebselen
274.19 g/mol,
C13H9NOSe
2-phenyl-1,2-benzoselenazol-3-one
Ebselen is a benzoselenazole that is 1,2-benzoselenazol-3-one carrying an additional phenyl substituent at position 2. Acts as a mimic of glutathione peroxidase. It has a role as a neuroprotective agent, an apoptosis inducer, an anti-inflammatory drug, an antioxidant, a hepatoprotective agent, a genotoxin, a radical scavenger, an enzyme mimic, an EC 1.3.1.8 [acyl-CoA dehydrogenase (NADP(+))] inhibitor, an EC 1.8.1.12 (trypanothione-disulfide reductase) inhibitor, an EC 1.13.11.33 (arachidonate 15-lipoxygenase) inhibitor, an EC 1.13.11.34 (arachidonate 5-lipoxygenase) inhibitor, an EC 2.5.1.7 (UDP-N-acetylglucosamine 1-carboxyvinyltransferase) inhibitor, an EC 2.7.10.1 (receptor protein-tyrosine kinase) inhibitor, an EC 3.5.4.1 (cytosine deaminase) inhibitor, an EC 5.1.3.2 (UDP-glucose 4-epimerase) inhibitor, a ferroptosis inhibitor, an antifungal agent, an EC 3.4.22.69 (SARS coronavirus main proteinase) inhibitor, an anticoronaviral agent, an antibacterial agent, an antineoplastic agent and an EC 3.1.3.25 (inositol–phosphate phosphatase) inhibitor.
Ebselen (also called PZ 51, DR3305, and SPI-1005), is a synthetic organoselenium molecule under preliminary investigation as a drug candidate.[1] It belongs to the class of compounds related to benzene and its derivatives.[1] It is being developed by the Seattle biotechnology company, Sound Pharmaceuticals, Inc.[1] It has also been reported to target tubulin, blocking its polymerization.[2]
Ebselen has been investigated for the treatment and basic science of Meniere’s Disease, Type 2 Diabetes Mellitus, and Type 1 Diabetes Mellitus.
Ebselen has been entered into clinical trials as a lead compound intended for the potential treatment of various diseases.[3] Its most advanced clinical trial is a Phase III study in people with Meniere’s disease, completed in July 2024.[4]
In vitro, ebselen is a mimic of glutathione peroxidase and reacts with peroxynitrite.[5] It is purported to have antioxidant and anti-inflammatory properties.[1][5]
Generally, synthesis of the characteristic scaffold of ebselen, the benzoisoselenazolone ring system, can be achieved either through reaction of primary amines (RNH2) with 2-(chloroseleno)benzoyl chloride (Route I),[6] by ortho-lithiation of benzanilides followed by oxidative cyclization (Route II) mediated by cupric bromide (CuBr2),[7] or through the efficient Cu-catalyzed selenation / heterocyclization of o-halobenzamides, a methodology developed by Kumar et al.[8] (Route III).
SYN
Synthesis of ebselen from benzoic acid by ortholithiation of benzanilide SOCl 2 =Thionyl chloride, R-NH 2 =Substituted aryl mine, BuLi/THF=n-butyllithium/ tetrahydrofuran, CuBr 2 =Cupper bromide, CH 2 =CH- CH 2 -Br = Allyl bromide.
SYN
Molecules, March 2017, 22(3):492
SYN
https://pubs.acs.org/doi/10.1021/ol102027j
2-Phenylbenzo[d][1,2]selenazol-3(2H)-one (1) from 2-Iodo-N-phenylbenzamide (Typical
Procedure): Copper iodide (114 mg, 0.6 mmol) and 1,10-phenanthroline (108 mg, 0.6 mmol)
were added into DMF (3 mL) in a single neck flask. Resulted brownish solution was stirred for
15 min and then 2-iodo-N-phenylbenzamide1 (0.97 g, 3.0 mmol), selenium powder (0.29 g, 3.6
mmol), and potassium carbonate powder (0.65 g, 4.7 mmol) were added sequentially to same reaction flask. Brown colored reaction mixture was refluxed at 110oC using refluxing condenser
under nitrogen atmosphere. Progress of reaction was monitored by TLC. Reaction mixture was
refluxed for 8h. After this, reaction mixture poured over brine solution (60 mL) and stirred for 3
h. Product was precipitated as white solid which was collected by filtration over Buchner funnel,
product was washed with water (15 mL x 2), dried in air, dissolved in ethyl acetate, concentrated
over rotary evaporator, resulted brown solid which was purified by column chromatography
using hexane/ ethyl acetate (8:2) over silica gel. Yield 0.69 g (84%), mp 182-183 °C (180-181
°C).14,15 1H NMR (400 MHz, DMSO-d6) 8.09 (d, J = 8.0 Hz, 1H), 7.91 (d, J = 8.0 Hz, 1H),
7.71-7.62 (m, 3H), 7.51-7.43 (m, 3H), 7.28 (t, J = 8.0 Hz, 1H). 1H NMR (400 MHz, CDCl3)
8.12 (d, 7.6 Hz, 1H), 7.68-7.62 (m, 4H), 7.52-7.41 (m, 3H), 7.29 (m, 1H). IR (plate): 3057, 2921,
1598, 1443, 1346, 1263, 1028 cm-1; ESMS m/z: 276 (M+H+).
2-Phenylbenzo[d][1,2]selenazol-3(2H)-one (1) from 2-Iodo-N-phenylbenzamide at 74 mmol
scale: Reaction was carried out at 74 mmol scale using 2-iodo-N-phenylbenzamide (24.00 g,
74.3 mmol), selenium powder (7.04 g, 89.1 mmol), CuI (2.83 g, 14.9 mmol), 1,10
phenanthroline (2.69 g, 14.9 mmol), and anhydrous potassium carbonate powder (15.40 g, 111.4
mmol) in DMF (50 mL) and procedure and workup followed are similar to 3.6 mmol scale
reaction. Yield 16.28 g (80%), Figure S1.
2-Phenylbenzo[d][1,2]selenazol-3(2H)-one (1) from 2-Bromo-N-phenylbenzamide: Ebselen 1
was prepared from 2-bromo-N-phenylbenzamide2 (1.00 g, 3.6 mmol), selenium powder (0.34 g,
4.3 mmol), K2CO3 powder (0.74 g, 5.4 mmol), CuI (137 mg, 0.7 mmol), and 1,10-phenanthroline
(130 mg, 0.7 mmol) in DMF (3 mL). Reaction mixture was refluxed for 16 h at 110oC. Progress of reaction was monitored by TLC. After completion of reaction, mixture was poured into brine
solution (60 mL) and the resulted white precipitate was washed with water (20 mL x 2), and
dried in air. Purification by column chromatography on silica gel using CH2Cl2 provided white
crystalline solid (0.77 g, 78%).
2-Phenylbenzo[d][1,2]selenazol-3(2H)-one (1) from 2-Chloro-N-phenylbenzamide: Reaction
was carried out at 4 mmol scale using 2-chloro-N-phenylbenzamide3 (1.00 g, 4.3 mmol), CuI
(172 mg, 0.9 mmol), 1,10-phenanthroline (162 mg, 0.9 mmol), selenium powder (0.41 g, 5.2
mmol), K2CO3 (0.89 g, 6.4 mmol) in DMF (4 mL). Reaction mixture was refluxed for 24 h at
110oC. Workup procedure is similar as followed for bromo substrate. Yield 0.55 g (47%).
The first patent for 2-phenyl-1,2-benzoselenazol-3(2H)-one was filed in 1980 and granted in 1982.[9]
Ebselen is in preliminary clinical development for the potential treatment of hearing loss and depression, among other medical indications.[3][10]
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| Names | |
|---|---|
| Preferred IUPAC name2-Phenyl-1,2-benzoselenazol-3(2H)-one | |
| Identifiers | |
| CAS Number | 60940-34-3 |
| 3D model (JSmol) | Interactive imageInteractive image |
| ChEBI | CHEBI:77543 |
| ChEMBL | ChEMBL51085 |
| ChemSpider | 3082 |
| ECHA InfoCard | 100.132.190 |
| PubChem CID | 3194 |
| UNII | 40X2P7DPGH |
| CompTox Dashboard (EPA) | DTXSID7045150 |
InChI | |
| SMILES | |
| Properties | |
| Chemical formula | C13H9NOSe |
| Molar mass | 274.17666 |
| Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). | |
////////Ebselen, Ebselene, PZ 51, DR 3305, SPI 1005, PHASE 3, 40X2P7DPGH, Meniere’s Disease, Type 2 Diabetes Mellitus, Type 1 Diabetes Mellitus
Posted by DR ANTHONY MELVIN CRASTO Ph.D
Categories: DIABETES, Phase3 drugs
Tags: 40X2P7DPGH, DR 3305, Ebselen, Ebselene, Meniere's Disease, PHASE 3, PZ 51, SPI 1005, Type 2 Diabetes Mellitus
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