Triazole Ureas Act as Diacylglycerol Lipase Inhibitors and Prevent Fasting-Induced Refeeding
摘要:
Triazole ureas constitute a versatile class of irreversible inhibitors that target serine hydrolases in both cells and animal models. We have previously reported that triazole ureas can act as selective and CNS-active inhibitors for diacylglycerol lipases (DAGLs), enzymes responsible for the biosynthesis of 2-arachidonoylglycerol (2 -AG) that activates cannabinoid CB1 receptor. Here, we report the enantio- and diastereoselective synthesis and structure-activity relationship studies. We found that 2,4 -substituted triazole ureas with a biphenylmethanol group provided the most optimal scaffold. Introduction of a chiral ether substituent on the 5 -position of the piperidine ring provided ultrapotent inhibitor 38 (DH376) with picomolar activity. Compound 38 temporarily reduces fasting -induced refeeding of mice, thereby emulating the effect of cannabinoid' CB1-receptor inverse agonists. This was mirrored by 39 (DO34) but also by the negative control compound 40 (DO53) (which does not inhibit DAGL), which indicates the triazole ureas may affect the energy balance in mice through multiple molecular targets.
Isolation of Ruthenium–Indolizine Complexes: Insight into the Metal-Induced Cycloisomerization of Propargylic Pyridines
作者:Lai-Hon Chung、Chun-Yuen Wong
DOI:10.1021/om400550w
日期:2013.7.8
A class of ruthenium-indolizine complexes was isolated and structurally characterized, and they represent the first examples of metalated indolizine species. Both experimental and theoretical investigations on the formation of these complexes support a 5-endo-dig cyclization mechanism and discount a vinylidene-5-exo-dig cyclization pathway.
A Bis(pyridyl)allenylidene Complex of Ruthenium: A “Molecular Clip” That Displays Intense Near-Infrared Absorption upon Coordination to a Ruthenium(II) Center
作者:Chun-Yuen Wong、Glenna So Ming Tong、Chi-Ming Che、Nianyong Zhu