2372-51-2Relevant academic research and scientific papers
New templates for syntheses of ring-fused, C10 β-turn peptidomimetics leading to the first reported small-molecule mimic of neurotrophin-3
Pattarawarapan, Mookda,Zaccaro, Maria Clara,Saragovi, Uri H.,Burgess, Kevin
, p. 4387 - 4390 (2002)
β-Turn peptidomimetics 1 were designed to mimic hot spots of neurotrophin-3 (NT-3) and others. Solid-phase syntheses of these were developed, though limitations were encountered with scale-up. Consequently, an alternative design with 2 was investigated. 1 and 2 favored distorted type I β-turn conformations in solution. It was found that peptidomimetic 2b has NT-3-like neurotrophic activity in cell survival assays, selectively binds the NT-3 receptor TrkC, and induces the tyrosine phosphorylation of the TrkC receptor.
Highly Enantioselective Synthesis of Indazoles with a C3-Quaternary Chiral Center Using CuH Catalysis
Ye, Yuxuan,Kevlishvili, Ilia,Feng, Sheng,Liu, Peng,Buchwald, Stephen L.
, p. 10550 - 10556 (2020/07/27)
C3-substituted 1H-indazoles are useful and important substructures in many pharmaceuticals. Methods for direct C3-functionalization of indazoles are relatively rare, compared to reactions developed for the more nucleophilic N1 and N2 positions. Herein, we report a highly C3-selective allylation reaction of 1H-N-(benzoyloxy)indazoles using CuH catalysis. A variety of C3-allyl 1H-indazoles with quaternary stereocenters were efficiently prepared with high levels of enantioselectivity. Density functional theory (DFT) calculations were performed to explain the reactivity differences between indazole and indole electrophiles, the latter of which was used in our previously reported method. The calculations suggest that the indazole allylation reaction proceeds through an enantioselectivity-determining six-membered Zimmerman-Traxler-type transition state, rather than an oxidative addition/reductive elimination sequence, as we proposed in the case of indole alkylation. The enantioselectivity of the reaction is governed by both ligand-substrate steric interactions and steric repulsions involving the pseudoaxial substituent in the six-membered allylation transition state.
A New Caged-Glutamine Derivative as a Tool To Control the Assembly of Glutamine-Containing Amyloidogenic Peptides
Awad, Loay,Jejelava, Nino,Burai, Ritwik,Lashuel, Hilal A.
, p. 2353 - 2360 (2016/12/23)
We present the design, synthesis, and characterization of a novel photocaged glutamine derivative (modified on the side chain of glutamine), and describe its use in enhancing peptide stability and solubility. Our results demonstrate that this approach can
A Clickable and Photocleavable Lipid Analogue for Cell Membrane Delivery and Release
Alam, Shahrina,Alves, Daiane S.,Whitehead, Stuart A.,Bayer, Andrew M.,McNitt, Christopher D.,Popik, Vladimir V.,Barrera, Francisco N.,Best, Michael D.
, p. 1021 - 1031 (2015/06/30)
For drug delivery purposes, the ability to conveniently attach a targeting moiety that will deliver drugs to cells and then enable controlled release of the active molecule after localization is desirable. Toward this end, we designed and synthesized clickable and photocleavable lipid analogue 1 to maximize the efficiency of bioconjugation and triggered release. This compound contains a dibenzocyclooctyne group for bioorthogonal derivatization linked via a photocleavable 2-nitrobenzyl moiety at the headgroup of a synthetic lipid backbone for targeting to cell membranes. To assess delivery and release using this system, we report fluorescence-based assays for liposomal modification and photocleavage in solution as well as through surface immobilization to demonstrate successful liposome functionalization and photoinduced release. In addition, fluorophore delivery to and release from live cells was confirmed and characterized using fluorescence microscopy and flow cytometry analysis in which 1 was delivered to cells, derivatized, and photocleaved. Finally, drug delivery studies were performed using an azide-tagged analogue of camptothecin, a potent anticancer drug that is challenging to deliver due to poor solubility. In this case, the ester attachment of the azide tag acted as a caging group for release by intracellular esterases rather than through photocleavage. This resulted in a dose-dependent response in the presence of liposomes containing delivery agent 1, confirming the ability of this compound to stimulate delivery to the cytoplasm of cells.
Triggered liposomal release through a synthetic phosphatidylcholine analogue bearing a photocleavable moiety embedded within the sn-2 acyl chain
Bayer, Andrew M.,Alam, Shahrina,Mattern-Schain, Samuel I.,Best, Michael D.
, p. 3350 - 3357 (2014/04/03)
Liposomes represent promising carriers for drug delivery applications. To maximize this potential, there has been significant interest in developing liposomal systems encapsulating molecular cargo that are highly stable until their contents are released r
Solid-phase synthesis of 1,2,5-trisubstituted imidazolidin-4-ones
Qin, Lan-Ying,Cole, Andrew G.,Metzger, Axel,O'Brien, Linda,Sun, Xiling,Wu, Jin,Xu, Yan,Xu, Kai,Zhang, Ying,Henderson, Ian
scheme or table, p. 419 - 422 (2009/05/11)
A general solid-phase synthesis of 1,2,5-trisubstituted imidazolidin-4-ones is described. The key synthetic transformation incorporates a microwave-assisted condensation of an α-amino amide on solid support with an aldehyde in solution to give the corresp
A versatile new synthetic route to 1 N-hydroxyindazoles
Lehmann, Fredrik,Koolmeister, Tobias,Odell, Luke R.,Scobie, Martin
supporting information; experimental part, p. 5078 - 5081 (2009/12/28)
A new and versatile cyclization reaction affording rare 1 JV-hydroxyindazoles Is presented. Treatment of 2-nitrobenzylamines with methanolic sodium hydroxide furnishes 1 N-hydroxylndazoles regloselectively and In high yield. The reaction tolerates a range
Photocleavage of peptides and oligodeoxynucleotides carrying 2-nitrobenzyl groups
Ramos, Roger,Manning, Brendan,Avino, Anna,Gargallo, Raimundo,Eritja, Ramon
experimental part, p. 613 - 622 (2009/08/08)
Peptides and oligodeoxynucleotides containing photolabile 2-nitrobenzyl groups as mid-sequences were prepared. Photocleavage of aqueous solutions of these compounds neared completion within 30 min to a few hours depending on the photolabile group used. A
Formulation of photocleavable liposomes and the mechanism of their content release
Chandra, Binita,Subramaniam, Rajesh,Mallik, Sanku,Srivastava
, p. 1730 - 1740 (2008/02/04)
In pursuit of designing photocleavable liposomes as drug delivery vehicles, we synthesized several amphiphilic lipids by connecting stearyl amine (as the non-polar tail) and charged amino acids (as polar heads) via the o-nitrobenzyl derivatives. The lipid
Controlled release liposomes and methods of use
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Page/Page column 12, (2008/06/13)
The present invention provides liposomes that include a trigger polypeptide, a lipid layer, and a compartment surrounded by the lipid layer and methods of using the liposomes.
