35386-24-4Relevant articles and documents
An integrated approach toward nanobret tracers for analysis of gpcr ligand engagement
Boursier, Michelle E.,Hall, Mary P.,Hurst, Robin,Killoran, Michael P.,Kirkland, Thomas A.,Levin, Sergiy,Machleidt, Thomas,Ohana, Rachel Friedman,Zimmerman, Kristopher
, (2021/05/31)
Gaining insight into the pharmacology of ligand engagement with G-protein coupled receptors (GPCRs) under biologically relevant conditions is vital to both drug discovery and basic research. NanoLuc-based bioluminescence resonance energy transfer (NanoBRET) monitoring competitive binding between fluorescent tracers and unmodified test compounds has emerged as a robust and sensitive method to quantify ligand engagement with specific GPCRs genetically fused to NanoLuc luciferase or the luminogenic HiBiT peptide. However, development of fluorescent tracers is often challenging and remains the principal bottleneck for this approach. One way to alleviate the burden of developing a specific tracer for each receptor is using promiscuous tracers, which is made possible by the intrinsic specificity of BRET. Here, we devised an integrated tracer discovery workflow that couples machine learning-guided in silico screening for scaffolds displaying promiscuous binding to GPCRs with a blend of synthetic strategies to rapidly generate multiple tracer candidates. Subsequently, these candidates were evaluated for binding in a NanoBRET ligand-engagement screen across a library of HiBiT-tagged GPCRs. Employing this workflow, we generated several promiscuous fluorescent tracers that can effectively engage multiple GPCRs, demonstrating the efficiency of this approach. We believe that this workflow has the potential to accelerate discovery of NanoBRET fluorescent tracers for GPCRs and other target classes.
Mild deprotection of the: N-tert -butyloxycarbonyl (N -Boc) group using oxalyl chloride
Awuah, Samuel G.,George, Nathaniel,Ofori, Samuel,Parkin, Sean
, p. 24017 - 24026 (2020/07/23)
We report a mild method for the selective deprotection of the N-Boc group from a structurally diverse set of compounds, encompassing aliphatic, aromatic, and heterocyclic substrates by using oxalyl chloride in methanol. The reactions take place under room temperature conditions for 1-4 h with yields up to 90percent. This mild procedure was applied to a hybrid, medicinally active compound FC1, which is a novel dual inhibitor of IDO1 and DNA Pol gamma. A broader mechanism involving the electrophilic character of oxalyl chloride is postulated for this deprotection strategy. This journal is
Mixed er-NHC/phosphine Pd(ii) complexes and their catalytic activity in the Buchwald-Hartwig reaction under solvent-free conditions
Ageshina, Alexandra A.,Sterligov, Grigorii K.,Rzhevskiy, Sergey A.,Topchiy, Maxim A.,Chesnokov, Gleb A.,Gribanov, Pavel S.,Nechaev, Mikhail S.,Asachenko, Andrey F.,Bermeshev, Maxim V.,Melnikova, Elizaveta K.
supporting information, p. 3447 - 3452 (2019/04/30)
A series of novel (NHC)PdCl2-PR3 complexes were synthesized and fully characterized by 1H, 13C, 31P NMR and FT-IR spectroscopy. These complexes showed high catalytic activity toward solvent-free Buchwald-Hartwig amination. Both primary and secondary amines were efficiently utilized under the same reaction conditions. The solvent-free synthesis of valuable N-aryl carbazoles and similar N-heterocyclic systems was described.
Leveraging a Low-Affinity Diazaspiro Orthosteric Fragment to Reduce Dopamine D3 Receptor (D3R) Ligand Promiscuity across Highly Conserved Aminergic G-Protein-Coupled Receptors (GPCRs)
Reilly, Sean W.,Riad, Aladdin A.,Hsieh, Chia-Ju,Sahlholm, Kristoffer,Jacome, Daniel A.,Griffin, Suzy,Taylor, Michelle,Weng, Chi-Chang,Xu, Kuiying,Kirschner, Nathan,Luedtke, Robert R.,Parry, Christopher,Malhotra, Shipra,Karanicolas, John,Mach, Robert H.
, p. 5132 - 5147 (2019/05/28)
Previously, we reported a 3-(2-methoxyphenyl)-9-(3-((4-methyl-5-phenyl-4H-1,2,4-triazol-3-yl)thio)propyl)-3,9-diazaspiro[5.5]undecane (1) compound with excellent dopamine D3 receptor (D3R) affinity (D3R Ki = 12.0 nM) and selectivity (D2R/D3R ratio = 905). Herein, we present derivatives of 1 with comparable D3R affinity (32, D3R Ki = 3.2 nM, D2R/D3R ratio = 60) and selectivity (30, D3R Ki = 21.0 nM, D2R/D3R ratio = 934). Fragmentation of 1 revealed orthosteric fragment 5a to express an unusually low D3R affinity (Ki = 2.7 μM). Compared to piperazine congener 31, which retains a high-affinity orthosteric fragment (5d, D3R Ki = 23.9 nM), 1 was found to be more selective for the D3R among D1- and D2-like receptors and exhibited negligible off-target interactions at serotoninergic and adrenergic G-protein-coupled receptors (GPCRs), common off-target sites for piperazine-containing D3R scaffolds. This study provides a unique rationale for implementing weakly potent orthosteric fragments into D3R ligand systems to minimize drug promiscuity at other aminergic GPCR sites.
Development of a Unique Heterogeneous Palladium Catalyst for the Suzuki–Miyaura Reaction using (Hetero)aryl Chlorides and Chemoselective Hydrogenation
Ichikawa, Tomohiro,Netsu, Moeko,Mizuno, Masahiro,Mizusaki, Tomoteru,Takagi, Yukio,Sawama, Yoshinari,Monguchi, Yasunari,Sajiki, Hironao
supporting information, p. 2269 - 2279 (2017/07/07)
A unique heterogeneous palladium catalyst (7% Pd/WA30) supported on an anion exchange resin, which contains N,N-dimethylaminoalkyl functionalities on the polymer backbone, was developed. 7% Pd/WA30 could smoothly catalyze Suzuki–Miyaura reactions of even less reactive heteroaryl chlorides and heteroarylboronic acids to afford various (hetero)biaryls due to the electron-donating effect of the tert-amines on WA30 to Pd species. It was also applicable as a chemoselective hydrogenation catalyst, showing inactivity for the hydrogenolysis of tert-butyldimethylsilyl (TBS) ethers, alkyl benzyl ethers, and benzyl alcohols. The tert-amines on WA30 acted as moderate catalyst poisons for Pd, resulting in chemoselective hydrogenation. 7% Pd/WA30 was reused for at least five times without any loss of the hydrogenation catalytic activity. (Figure presented.).
Highly Selective Dopamine D3 Receptor Antagonists with Arylated Diazaspiro Alkane Cores
Reilly, Sean W.,Griffin, Suzy,Taylor, Michelle,Sahlholm, Kristoffer,Weng, Chi-Chang,Xu, Kuiying,Jacome, Daniel A.,Luedtke, Robert R.,Mach, Robert H.
, p. 9905 - 9910 (2017/12/26)
A series of potent and selective D3 receptor (D3R) analogues with diazaspiro alkane cores were synthesized. Radioligand binding of compounds 11, 14, 15a, and 15c revealed favorable D3R affinity (Ki = 12-25.6 nM) and were highly selective for D3R vs D3R (ranging from 264- to 905-fold). Variation of these novel ligand architectures can be achieved using our previously reported 10-20 min benchtop C-N cross-coupling methodology, affording a broad range of arylated diazaspiro precursors.
5-[3-[PIPERAZIN-1-YL]-3-OXO-PROPYL]-IMIDAZOLIDINE-2,4-DIONE DERIVATIVES AS ADAMTS 4 AND 5 INHIBITORS FOR TREATING E.G. OSTEOARTHRITIS
-
Paragraph 0219; 0304, (2018/01/15)
The present invention discloses 5-[3-[piperazin-l-yl]-3-oxo-propyl]-imidazolidine-2,4-dione derivatives according to Formula (I), wherein R1, R2, R3a, R3b, R6a, R6b, the subscript n and Cy are as defined herein. The present invention relates to compounds inhibiting ADAMTS 4 and 5 for the prophylaxis or treatment of inflammatory diseases or diseases involving degradation of cartilage or disruption of cartilage homeostasis, such as e.g. osteoarthritis.
Pd-Catalyzed Synthesis of Piperazine Scaffolds under Aerobic and Solvent-Free Conditions
Reilly, Sean W.,Mach, Robert H.
supporting information, p. 5272 - 5275 (2016/10/31)
A facile Pd-catalyzed methodology providing an efficient synthetic route to biologically relevant arylpiperazines under aerobic conditions is reported. Electron donating and sterically hindered aryl chlorides were aminated to afford yields up to 97%, with examples using piperazine as solvent, illustrating an ecofriendly, cost-effective synthesis of these privileged structures.
Charge-transfer-directed radical substitution enables para-selective C-H functionalization
Boursalian, Gregory B.,Ham, Won Seok,Mazzotti, Anthony R.,Ritter, Tobias
, p. 810 - 815 (2016/07/29)
Efficient C-H functionalization requires selectivity for specific C-H bonds. Progress has been made for directed aromatic substitution reactions to achieve ortho and meta selectivity, but a general strategy for para-selective C-H functionalization has remained elusive. Herein we introduce a previously unappreciated concept that enables nearly complete para selectivity. We propose that radicals with high electron affinity elicit arene-to-radical charge transfer in the transition state of radical addition, which is the factor primarily responsible for high positional selectivity. We demonstrate with a simple theoretical tool that the selectivity is predictable and show the utility of the concept through a direct synthesis of aryl piperazines. Our results contradict the notion, widely held by organic chemists, that radical aromatic substitution reactions are inherently unselective. The concept of radical substitution directed by charge transfer could serve as the basis for the development of new, highly selective C-H functionalization reactions.
Identification of novel GLUT inhibitors
Siebeneicher, Holger,Bauser, Marcus,Buchmann, Bernd,Heisler, Iring,Müller, Thomas,Neuhaus, Roland,Rehwinkel, Hartmut,Telser, Joachim,Zorn, Ludwig
, p. 1732 - 1737 (2016/07/27)
The compound class of 1H-pyrazolo[3,4-d]pyrimidines was identified using HTS as very potent inhibitors of facilitated glucose transporter 1 (GLUT1). Extensive structure–activity relationship studies (SAR) of each ring system of the molecular framework was established revealing essential structural motives (i.e., ortho-methoxy substituted benzene, piperazine and pyrimidine). The selectivity against GLUT2 was excellent and initial in vitro and in vivo pharmacokinetic (PK) studies are encouraging.
