Category: thiazole

Shin, Chung-gi; Okumura, Kazuo; Ito, Akio; Nakamura, Yutaka published the artcile< Synthesis of a common main skeleton of thiostrepton peptide antibiotics, A 10255G and J>, Safety of Ethyl 2-(((tert-butoxycarbonyl)amino)methyl)thiazole-4-carboxylate, the main research area is thiostrepton peptide antibiotic A 10255G; peptide thiostrepton antibiotic A 10255J.

The synthesis of protected, common main skeleton I (boc = Me3CO2C) of thiostrepton peptides, A10255G and J, containing a few kinds of unusual amino acids is described.

Chemistry Letters published new progress about 96929-05-4. 96929-05-4 belongs to class thiazole, and the molecular formula is C12H18N2O4S, Safety of Ethyl 2-(((tert-butoxycarbonyl)amino)methyl)thiazole-4-carboxylate.

Referemce:
Thiazole | C3H3NS – PubChem,
Thiazole | chemical compound | Britannica

Medina, Jose M.; Kang, Taeho; Erbay, Tugce G.; Shao, Huiling; Gallego, Gary M.; Yang, Shouliang; Tran-Dube, Michelle; Richardson, Paul F.; Derosa, Joseph; Helsel, Ryan T.; Patman, Ryan L.; Wang, Fen; Ashcroft, Christopher P.; Braganza, John F.; McAlpine, Indrawan; Liu, Peng; Engle, Keary M. published the artcile< Cu-Catalyzed Hydroboration of Benzylidenecyclopropanes: Reaction Optimization, (Hetero)Aryl Scope, and Origins of Pathway Selectivity>, Application of C4H3NOS, the main research area is benzylidenecyclopropane preparation copper catalyzed hydroboration diborane; cyclopropylboronic ester preparation reactivity; potential energy surface copper catalyzed hydroboration benzylidenecyclopropane; Copper catalysis; benzylidenecyclopropanes; cyclopropylboronic esters; heterocycles; hydroborations; β-carbon elimination.

The Cu-catalyzed hydroboration of benzylidenecyclopropanes, conveniently accessed in one step from readily available benzaldehydes, is reported. Under otherwise identical reaction conditions, two distinct phosphine ligands grant access to different products by either suppressing or promoting the cyclopropane opening via β-C elimination. Computational studies provide insight into how the rigidity and steric environment of these different bis-phosphine ligands influence the relative activation energies of β-C elimination vs. protodecupration from the key benzylcopper intermediate. The method tolerates a wide variety of heterocycles prevalent in clin. and preclin. drug development, giving access to valuable synthetic intermediates. The versatility of the tertiary cyclopropylboronic ester products is demonstrated through several derivatization reactions.

ACS Catalysis published new progress about Alkenes Role: PEP (Physical, Engineering or Chemical Process), PRP (Properties), RCT (Reactant), SPN (Synthetic Preparation), PROC (Process), RACT (Reactant or Reagent), PREP (Preparation) (benzylidenecyclopropanes). 1003-32-3 belongs to class thiazole, and the molecular formula is C4H3NOS, Application of C4H3NOS.

Referemce:
Thiazole | C3H3NS – PubChem,
Thiazole | chemical compound | Britannica

Pietkiewicz, Adrian L.; Zhang, Yuqi; Rahimi, Marwa N.; Stramandinoli, Michael; Teusner, Matthew; McAlpine, Shelli R. published the artcile< RITA Mimics: Synthesis and Mechanistic Evaluation of Asymmetric Linked Trithiazoles>, Related Products of 96929-05-4, the main research area is RITA mimic trithiazole preparation antitumor colorectal p53 cMyc Mcl1; Heterocycle; Mcl-1; RITA; antitumor; c-Myc; p53; thiazole.

The established cytotoxic agent RITA contains a thiophene-furan-thiophene backbone and two terminal alc. groups. Herein the authors investigate the effect of using thiazoles as the backbone in RITA-like mols. and modifying the terminal groups of these trithiazoles, thereby generating 41 unique structures. Incorporating side chains with varied steric bulk allowed the authors to investigate how size and a stereocenter impacted biol. activity. Subjecting compounds to growth inhibition assays on HCT-116 cells showed that the most potent compounds 7d (BocHN-D-Val-Thiazole-Thiazole-Thiazole-OEt), 7e (BocHN-L-Val-Thiazole-Thiazole-Thiazole-OEt), and 7h (BocHN-CHA-thiazole-thiazole-thiazole-OEt) had GIC50 values of 4.4, 4.4, and 3.4 μM, resp., vs. RITA (GIC50 of 800 nM). Anal. of these compounds in apoptosis assays proved that 7d, 7e, and 7h were as effective as RITA at inducing apoptosis. Evaluating the impact of 7h on proteins targeted by RITA (p53, c-Myc, and Mcl-1) indicated that it acts via a different mechanism of action to that of RITA. RITA suppressed Mcl-1 protein via p53, whereas compound 7h suppressed Mcl-1 expression via an alternative mechanism independent of p53.

ACS Medicinal Chemistry Letters published new progress about Antiproliferative agents. 96929-05-4 belongs to class thiazole, and the molecular formula is C12H18N2O4S, Related Products of 96929-05-4.

Referemce:
Thiazole | C3H3NS – PubChem,
Thiazole | chemical compound | Britannica

Bilchak, Connor R.; Jhalaria, Mayank; Adhikari, Sabin; Midya, Jiarul; Huang, Yucheng; Abbas, Zaid; Nikoubashman, Arash; Benicewicz, Brian C.; Rubinstein, Michael; Kumar, Sanat K. published the artcile< Understanding Gas Transport in Polymer-Grafted Nanoparticle Assemblies>, Formula: C3H5NS2, the main research area is gas transport polymer grafted nanoparticle.

We rationalize the unusual gas transport behavior of polymer-grafted nanoparticle (GNP) membranes. While gas permeabilities depend specifically on the chem. of the polymers considered, we focus here on permeabilities relative to the corresponding pure polymer, which show interesting, “”universal”” behavior. For a given NP radius, Rc, and for large enough areal grafting densities, σ, to be in the dense brush regime, we find that gas permeability enhancements display a maximum as a function of the graft chain mol. weight, Mn. Based on a recently proposed theory for the structure of a spherical brush in a melt of GNPs, we conjecture that this peak permeability occurs when the densely grafted polymer brush has the highest, packing-induced extension free energy per chain. The corresponding brush thickness is predicted to be hmax = sqr3Rc, independent of chain chem. and σ, i.e., at an apparently universal value of the NP volume fraction (or loading), ϕNP, ϕNP,max = [Rc/(Rc + hmax)]3 ≈ 0.049. Motivated by this conclusion, we measured CO2 and CH4 permeability enhancements across a variety of Rc, Mn, and σ and find that they behave in a similar manner when considered as a function of ϕNP, with a peak in the near vicinity of the predicted ϕNP,max. Thus, the chain length-dependent extension free energy appears to be the critical variable in determining the gas permeability for these hybrid materials. The emerging picture is that these curved polymer brushes, at high enough σ, behave akin to a two-layer transport medium-the region in the near vicinity of the NP surface is comprised of extended polymer chains that speed up gas transport relative to the unperturbed melt. The chain extension free energy increases with increasing chain length, up to a maximum, and apparently leads to an increasing gas permeability. For long enough grafts, there is an outer region of chain segments that is akin to an unperturbed melt with slow gas transport. The permeability maximum and decreasing permeability with increasing chain length then follow naturally.

Macromolecules (Washington, DC, United States) published new progress about Annealing. 96-53-7 belongs to class thiazole, and the molecular formula is C3H5NS2, Formula: C3H5NS2.

Referemce:
Thiazole | C3H3NS – PubChem,
Thiazole | chemical compound | Britannica

Moreira, A. C.; Amaral, D. T.; Gabriel, G. V. M.; Viviani, V. R. published the artcile< Cloning and molecular properties of a novel luciferase from the Brazilian Bicellonycha lividipennis (Lampyridae: Photurinae) firefly: comparison with other firefly luciferases>, Product Details of C11H8N2O3S2, the main research area is Bicellonycha Photuris Luciola cloning mol properties luciferase cDNA; Bicellonycha lividipennis; Firefly luciferase; Luciferase; Metal sensitive luciferase; pH-sensitive luciferase.

Several firefly luciferases eliciting light emission in the yellow-green range of the spectrum and with distinct kinetic properties have been already cloned, sequenced, and characterized. Some of them are currently being applied as anal. reagents and reporter genes for bioimaging and biosensors, and more recently as potential color tuning indicators of intracellular pH and toxic metals. They were cloned from the subfamilies Lampyrinae (Photinini: Photinus pyralis, Macrolampissp2; Cratomorphini: Cratomorphus distinctus), Photurinae (Photuris pennsylvanica), Luciolinae (Luciola cruciata, L. lateralis, L. mingrelica, L. italica, Hotaria parvula), and Amydetinae (Amydetes vivianii) occurring in different parts of the world. The largest number has been cloned from fireflies occurring in Brazilian biomes. Taking advantage of the large biodiversity of fireflies occurring in the Brazilian Atlantic rainforest, here we report the cloning and characterization of a novel luciferase cDNA from the Photurinae subfamily, Bicellonycha lividipennis, which is a very common firefly in marshlands in Brazil. As expected, multialignements and phylogenetic anal. show that this luciferase clusters with Photuris pennsylvanica adult isoenzyme, and with other adult lantern firefly luciferases, in reasonable agreement with traditional phylogenetic anal. The luciferase elicits light emission in the yellow-green region, has kinetics properties similar to other adult lantern firefly luciferases, including pH- and metal sensitivities, but displays a lower sensitivity to nickel, which is suggested to be caused by the natural substitution of H310Y. Graphical abstract: [graphic not available: see fulltext].

Photochemical & Photobiological Sciences published new progress about Amino acids Role: BSU (Biological Study, Unclassified), BIOL (Biological Study). 2591-17-5 belongs to class thiazole, and the molecular formula is C11H8N2O3S2, Product Details of C11H8N2O3S2.

Referemce:
Thiazole | C3H3NS – PubChem,
Thiazole | chemical compound | Britannica

Luo, Kai; Chen, Yao-Zhong; Chen, Li-Xian; Wu, Lei published the artcile< Autoxidative C(sp2)-P Formation: Direct Phosphorylation of Heteroarenes under Oxygen, Metal-Free, and Solvent-Free Conditions>, Synthetic Route of 20582-55-2, the main research area is phosphorylation heteroarene arylphosphine oxide; heteroaryl phosphine oxide preparation.

The authors reveal here a direct autoxidative phosphorylation of heteroarenes induced by O under metal-free and solvent-free conditions. This new methodol. provides an economical, operationally simple, and environmentally friendly approach toward (Het)C(sp2)-P formation with medium to excellent yields. Heteroarenes including thiazole and quinoxaline derivatives are applicable under standard conditions, which is testified via a radical mechanism.

Journal of Organic Chemistry published new progress about Aromatic hydrocarbons Role: RCT (Reactant), RACT (Reactant or Reagent) (heteroarenes). 20582-55-2 belongs to class thiazole, and the molecular formula is C7H9NO2S, Synthetic Route of 20582-55-2.

Referemce:
Thiazole | C3H3NS – PubChem,
Thiazole | chemical compound | Britannica

Chen, Binhui; Guo, Shanshan; Guo, Xiao; Zhang, Guolin; Yu, Yongping published the artcile< Selective Access to 4-Substituted 2-Aminothiazoles and 4-Substituted 5-Thiocyano-2-aminothiazoles from Vinyl Azides and Potassium Thiocyanate Switched by Palladium and Iron Catalysts>, Formula: C9H7N3O2S, the main research area is aminothiazole preparation; thiocyanoaminothiazole preparation; palladium iron catalyst vinyl azide reaction potassium thiocyanate; thiazole amino preparation.

A highly selective construction of 4-substituted 2-aminothiazoles and 4-substituted 5-thiocyano-2-aminothiazoles, resp., catalyzed by palladium(II) acetate and promoted by iron(III) bromide from vinyl azides and potassium thiocyanate has been developed. E.g., reaction of PhC(:CH2)N3 with potassium thiocyanate, catalyzed by palladium(II) acetate gave 90% 2-aminothiazole derivative (I). Use of readily available starting materials, high selectivity, as well as mild reaction conditions make this practical method particularly attractive.

Organic Letters published new progress about Azides Role: RCT (Reactant), RACT (Reactant or Reagent) (vinyl). 57493-24-0 belongs to class thiazole, and the molecular formula is C9H7N3O2S, Formula: C9H7N3O2S.

Referemce:
Thiazole | C3H3NS – PubChem,
Thiazole | chemical compound | Britannica

Bonnevide, Marine; Jimenez, Andrew M.; Dhara, Deboleena; Phan, Trang N. T.; Malicki, Nicolas; Abbas, Zaid M.; Benicewicz, Brian; Kumar, Sanat K.; Couty, Marc; Gigmes, Didier; Jestin, Jacques published the artcile< Morphologies of Polyisoprene-Grafted Silica Nanoparticles in Model Elastomers>, Synthetic Route of 96-53-7, the main research area is morphol polyisoprene grafted silica nanoparticle model elastomer.

We control nanoparticle (NP) dispersion by leveraging the entropic and enthalpic effects associated with mixing silica NPs grafted with polyisoprene (PI) chains into matrixes of varying degrees of chem. dissimilarity. Previous work in this area has primarily focused on entropic factors alone, and hence, this work represents a significant advance over the current state-of-the-art. We show using a combination of transmission electron microscopy/small-angle X-ray scattering that mixing grafted particles with PI matrixes of identical microstructure yields dispersion states as found in the literature for such entropic systems. However, replacing the PI matrix chains with dissimilar matrixes leads to an introduction of enthalpic interactions that, in some cases, can drastically change the resulting morphol. In particular, while slightly different PI microstructures for the grafted and free chains only yield moderated differences, using styrene-butadiene copolymers as a matrix leads to a completely different behavior. In the last case, phase separation becomes more likely with the increasing graft length, while the PI system (whose behavior is dominated by entropic factors) shows the opposite behavior. Tuning the relative importance of enthalpic vs. entropic factors is thus another tool in controlling the self-assembled structure of NPs, which gives rise to enhanced macroscopic properties in the composite.

Macromolecules (Washington, DC, United States) published new progress about Agglomeration. 96-53-7 belongs to class thiazole, and the molecular formula is C3H5NS2, Synthetic Route of 96-53-7.

Referemce:
Thiazole | C3H3NS – PubChem,
Thiazole | chemical compound | Britannica

Vekhoff, Pierre; Duca, Maria; Guianvarc’h, Dominique; Benhida, Rachid; Arimondo, Paola B. published the artcile< Sequence-Specific Base Pair Mimics Are Efficient Topoisomerase IB Inhibitors>, Related Products of 57493-24-0, the main research area is triplex oligonucleotide DNA topoisomerase IB inhibitor.

Topoisomerase IB controls DNA topol. by cleaving DNA transiently. This property is used by inhibitors, such as camptothecin, that stabilize, by inhibiting the religation step, the cleavage complex, in which the enzyme is covalently attached to the 3′-phosphate of the cleaved DNA strand. These drugs are used in clinics as antitumor agents. Because three-dimensional structural studies have shown that camptothecin derivatives act as base pair mimics and intercalate between two base pairs in the ternary DNA-topoisomerase-inhibitor complex, we hypothesized that base pairs mimics could act like campthotecin and inhibit the religation reaction after the formation of the topoisomerase I-DNA cleavage complex. We show here that three base pair mimics, nucleobases analogs of the aminophenyl-thiazole family, once targeted specifically to a DNA sequence were potent topoisomerase IB inhibitors. The targeting was achieved through covalent linkage to a sequence-specific DNA ligand, a triplex-forming oligonucleotide, and was necessary to position and keep the nucleobase analog in the cleavage complex. In the absence of triplex formation, only a weak binding to the DNA and topoisomerase I-mediated DNA cleavage was observed The three compounds were equally active once conjugated, implying that the intercalation of the nucleobase upon triplex formation is the essential feature for the inhibition activity.

Biochemistry published new progress about DNA Role: BSU (Biological Study, Unclassified), BIOL (Biological Study). 57493-24-0 belongs to class thiazole, and the molecular formula is C9H7N3O2S, Related Products of 57493-24-0.

Referemce:
Thiazole | C3H3NS – PubChem,
Thiazole | chemical compound | Britannica

Chen, Ning; Jia, Weiyi; Xu, Jiaxi published the artcile< A Versatile Synthesis of Various Substituted Taurines from Vicinal Amino Alcohols and Aziridines>, Related Products of 171877-39-7, the main research area is taurine substituted preparation amino alc aziridine carbon disulfide; oxidation thiazolidinethione.

Taurine and structurally diverse substituted taurines have been synthesized by peroxyformic acid oxidation of the thiazolidine-2-thione intermediates generated from vicinal amino alcs. or aziridines and carbon disulfide. The stereochem. and mechanisms of the reactions are discussed. The method is a salt-free and versatile route, convenient in terms of purification, and can be used to synthesize optically active substituted taurines. (© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009).

European Journal of Organic Chemistry published new progress about Amino alcohols Role: RCT (Reactant), RACT (Reactant or Reagent). 171877-39-7 belongs to class thiazole, and the molecular formula is C10H11NS2, Related Products of 171877-39-7.

Referemce:
Thiazole | C3H3NS – PubChem,
Thiazole | chemical compound | Britannica