51300-52-8Relevant academic research and scientific papers
Discovery, structure-activity relationship studies, and anti-nociceptive effects of 1-phenyl-3,6,6-trimethyl-1,5,6,7-tetrahydro-4H-indazol-4-one as novel opioid receptor agonists
Cheng, Ming-Fu,Ou, Li-Chin,Chen, Shu-Chun,Chang, Wan-Ting,Law, Ping-Yee,Loh, Horace H.,Chao, Yu-Sheng,Shih, Chuan,Yeh, Shiu-Hwa,Ueng, Shau-Hua
, p. 4694 - 4703 (2014/10/15)
The μ-opioid receptor (MOR) is the major opioid receptor targeted by most analgesics in clinical use. However, the use of all known MOR agonists is associated with severe adverse effects. We reported that the 1-phenyl-3,6,6-trimethyl-1,5,6,7-tetrahydro-4H-indazol-4-ones are novel opioid receptor agonists. Subsequent structural modification resulted in the potent MOR/KOR (κ-opioid receptor) agonists 19, 20, and 21. Testing the analgesic effect of these in WT B6 mice (tail-flick test) gave ED50 values of 8.4, 10.9, and 26.6 mg/kg, respectively. The 1-phenyl-3,6,6-trimethyl-1,5,6,7- tetrahydro-4H-indazol-4-one core could be addressed in 1 or 2 synthetic steps with moderate to high percent of yield. In the adenylyl cyclase assay, compound 19 displayed a MOR/KOR agonist profile, with IC50 values of 0.73 and 0.41 μM, respectively. Current results suggest that compound 19 is a promising lead to go further development and in vitro/in vivo adverse effects studies.
1-(1-phthalazinyl)- and 1-(4-methoxyphenyl)-6,6-dimethyl-4-oxo-4,5,6,7-tetrahydroindazole
Strakov,Strakova,Petrova
, p. 610 - 612 (2007/10/03)
2-(1-Phthalazinylhydrazino)methylene- (IIIa) or 2-(1-phthalazinylhydrazino)ethylidene-5,5-dimethyl-1,3-cyclohexanediones (IIIb) were prepared from 1-hydrazinophthalazine and 2-formyl- or 2-acetyldimedone. Cyclization of IIIb in the presence of p-TsOH gave 1-(1-phthalazinyl)3,6,6-trimethyl-4-oxo-4,5,6,7-tetrahydroindazole. Reaction of 4-methoxyphenylhydrazine with 2-formyl- and 2-acetyldimedone gave the corresponding 1-(4-methoxyphenyl)-4-oxo-4,5,6,7-tetrahydroindazole. In the case of 2-formyldimedone the intermediate 2-(4-methoxyphenylhydrazinomethylene)-5,5-dimethyl-1, 3-cyclohexanedione was isolated. 1996 Plenum Publishing Corporation.
