N′-(Arylsulfonyl)pyrazoline-1-carboxamidines as Novel, Neutral 5-Hydroxytryptamine 6 Receptor (5-HT6R) Antagonists with Unique Structural Features
摘要:
The 5-HT6 receptor (5-HT6R) has been in the spotlight for several years regarding CNS-related diseases. We set out to discover novel, neutral 5-HT6R antagonists to improve off-target selectivity compared to basic amine-containing scaffolds dominating the field. High-throughput screening identified the N'-(sulfonyl)pyrazoline-1-carboxamidine scaffold as a promising neutral core for starting hit-to-lead. Medicinal chemistry, molecular modeling, small molecule NMR and X-ray crystallography were subsequently applied to optimize the leads into antagonists (compounds 1-49) displaying high 5-HT6R affinity with optimal off-target selectivity. Unique structural features include a pseudoaromatic system and an internal hydrogen bond freezing the bioactive conformation. While physicochemical properties and CNS availability were generally favorable, significant efforts had to be made to improve metabolic stability. The optimized structure 42 is an extremely selective, hERG-free, high-affinity 5-HT6R antagonist showing good human in vitro metabolic stability. Rat pharrnacokinetic data were sufficiently good to enable further in vivo profiling.
Organocatalytic Enantioselective Cross-Vinylogous Rauhut-Currier Reaction of Methyl Coumalate with Enals
作者:Qiwen Liu、Liansuo Zu
DOI:10.1002/anie.201805019
日期:2018.7.20
The organocatalytic enantioselective intermolecular cross‐vinylogous Rauhut–Currier (RC) reaction of methyl coumalate with α,β‐unsaturated aldehydes is reported, and the enals are activated by iminium catalysis to serve as the Michael acceptors and methyl coumalate is used as an activated diene to generate a latent enolate. The excellent selectivity is driven by the aromaticity of methyl coumalate
One-Pot Synthesis of (<i>S</i>)-Baclofen via Aldol Condensation of Acetaldehyde with Diphenylprolinol Silyl Ether Mediated Asymmetric Michael Reaction as a Key Step
作者:Yujiro Hayashi、Daisuke Sakamoto、Daichi Okamura
DOI:10.1021/acs.orglett.5b02839
日期:2016.1.4
An efficient asymmetric total synthesis of (S)-baclofen was accomplished via a one-pot operation from commercially available materials using sequential reactions, such as aldol condensation of acetaldehyde, diphenylprolinol silyl ether mediated asymmetricMichaelreaction of nitromethane, Kraus–Pinnick oxidation, and Raney Ni reduction. Highly enantioenriched baclofen was obtained in one pot with a
Synthesis and SAR evaluation of coumarin derivatives as potent cannabinoid receptor agonists
作者:Florian Mohr、Thomas Hurrle、Lindsey Burggraaff、Lukas Langer、Martijn P. Bemelmans、Maximilian Knab、Martin Nieger、Gerard J.P. van Westen、Laura H. Heitman、Stefan Bräse
DOI:10.1016/j.ejmech.2021.113354
日期:2021.8
We report the development and extensive structure-activity relationship evaluation of a series of modified coumarins as cannabinoidreceptor ligands. In radioligand, and [35S]GTPγS binding assays the CB receptor binding affinities and efficacies of the new ligands were determined. Furthermore, we used a ligand-based docking approach to validate the empirical observed results. In conclusion, several
To realize in vivo deep two-photon fluorescence microscopy (TPFM), a probe is required that can undergo two-photon excitation and emit in the optical window of tissues (650–1100 nm). In addition, t...