Category: ethers-buliding-blocks

Fukuda, Hayato published the artcileSynthesis and Structure-Activity Relationship of Vicenistatin, a Cytotoxic 20-Membered Macrolactam Glycoside, Recommanded Product: (+)-B-Methoxydiisopinocampheylborane, the publication is Chemistry – An Asian Journal (2012), 7(12), 2872-2881, S2872/1-S2872/34, database is CAplus and MEDLINE.

We have developed two syntheses of viceniqstatin and its analogs. Our first-generation strategy included the rapid and sequential assembly of the macrocyclic lactam by using an intermol. Horner-Wadsworth-Emmons reaction between the C3-C13 fragment and the C1-C2, C14-C19 fragment, followed by an intramol. Stille coupling reaction. The second-generation strategy utilized a ring-closing metathesis of a hexa-ene intermediate to generate the desired 20-membered macrolactam. This second-generation strategy made it possible to prepare synthetic analogs of vicenistatin, including the C20- and/or C23-demethyl analogs. Evaluation of the cytotoxic effect of these analogs indicated the importance of the fixed conformation of aglycon for determining the biol. activity of the vicenistatins.

Chemistry – An Asian Journal published new progress about 99438-28-5. 99438-28-5 belongs to ethers-buliding-blocks, auxiliary class Chiral,Aliphatic cyclic hydrocarbon, name is (+)-B-Methoxydiisopinocampheylborane, and the molecular formula is C21H37BO, Recommanded Product: (+)-B-Methoxydiisopinocampheylborane.

Referemce:
https://en.wikipedia.org/wiki/Ether,
Ether | (C2H5)2O – PubChem

Bai, Xiaohui published the artcileA new GLP-1 analogue with prolonged glucose-lowering activity in vivo via backbone-based modification at the N-terminus, Recommanded Product: (S)-2-((((9H-Fluoren-9-yl)methoxy)carbonyl)(methyl)amino)-3-phenylpropanoic acid, the publication is Bioorganic & Medicinal Chemistry (2016), 24(6), 1163-1170, database is CAplus and MEDLINE.

Glucagon-like peptide-1 (GLP-1) is an endogenous insulinotropic hormone with wonderful glucose-lowering activity. However, its clin. use in type II diabetes is limited due to its rapid degradation at the N-terminus by dipeptidyl peptidase IV (DPP-IV). Among the N-terminal modifications of GLP-1, backbone-based modification was rarely reported. Herein, the authors employed two backbone-based strategies to modify the N-terminus of tGLP-1. Firstly, the amide N-methylated analogs were designed and synthesized to make a full screening of the N-terminal amide bonds, and the loss of GLP-1 receptor (GLP-1R) activation indicated the importance of amide H-bonds. Secondly, with retaining the N-terminal amide H-bonds, the β-peptide replacement strategy was used and analogs were synthesized. By two rounds of screening, analog (I) was identified. Analog (I) greatly improved the DPP-IV resistance with maintaining good GLP-1R activation in vitro, and showed approx. a 4-fold prolonged blood glucose-lowering activity in vivo in comparison with tGLP-1. This modification strategy will benefit the development of GLP-1-based anti-diabetic drugs.

Bioorganic & Medicinal Chemistry published new progress about 77128-73-5. 77128-73-5 belongs to ethers-buliding-blocks, auxiliary class Inhibitor, name is (S)-2-((((9H-Fluoren-9-yl)methoxy)carbonyl)(methyl)amino)-3-phenylpropanoic acid, and the molecular formula is C25H23NO4, Recommanded Product: (S)-2-((((9H-Fluoren-9-yl)methoxy)carbonyl)(methyl)amino)-3-phenylpropanoic acid.

Referemce:
https://en.wikipedia.org/wiki/Ether,
Ether | (C2H5)2O – PubChem

Misu, Ryosuke published the artcileStructure-activity relationship study of tachykinin peptides for the development of novel neurokinin-3 receptor selective agonists, HPLC of Formula: 77128-73-5, the publication is Bioorganic & Medicinal Chemistry (2013), 21(8), 2413-2417, database is CAplus and MEDLINE.

Neurokinin B (NKB) is a potential regulator of pulsatile gonadotropin-releasing hormone (GnRH) secretion via activation of the neurokinin-3 receptor (NK3R). NKB with the consensus sequence of the tachykinin peptide family also binds to other tachykinin receptors [neurokinin-1 receptor (NK1R) and neurokinin-2 receptor (NK2R)] with low selectivity. In order to identify the structural requirements for the development of novel potent and selective NK3R agonists, a structure-activity relationship (SAR) study of [MePhe⁷]-NKB and other naturally occurring tachykinin peptides was performed. The substitutions to naturally occurring tachykinins with Asp and MePhe improved the receptor binding and agonistic activity for NK3R. The corresponding substitutions to NKB provided an NK3R selective analog.

Bioorganic & Medicinal Chemistry published new progress about 77128-73-5. 77128-73-5 belongs to ethers-buliding-blocks, auxiliary class Inhibitor, name is (S)-2-((((9H-Fluoren-9-yl)methoxy)carbonyl)(methyl)amino)-3-phenylpropanoic acid, and the molecular formula is C25H23NO4, HPLC of Formula: 77128-73-5.

Referemce:
https://en.wikipedia.org/wiki/Ether,
Ether | (C2H5)2O – PubChem

Wang, Conan K. published the artcileExploring experimental and computational markers of cyclic peptides: Charting islands of permeability, Application of (S)-2-((((9H-Fluoren-9-yl)methoxy)carbonyl)(methyl)amino)-3-phenylpropanoic acid, the publication is European Journal of Medicinal Chemistry (2015), 202-213, database is CAplus and MEDLINE.

An increasing number of macrocyclic peptides that cross biol. membranes are being reported, suggesting that it might be possible to develop peptides into orally bioavailable therapeutics; however, current understanding of what makes macrocyclic peptides cell permeable is still limited. Here, we synthesized 62 cyclic hexapeptides and characterized their permeability using in vitro assays commonly used to predict in vivo absorption rates, i.e. the Caco-2 and PAMPA assays. We correlated permeability with exptl. measured parameters of peptide conformation obtained using rapid methods based on chromatog. and NMR spectroscopy. Based on these correlations, we propose a model describing the interplay between peptide permeability, lipophilicity and hydrogen bonding potential. Specifically, peptides with very high permeability have high lipophilicity and few solvent hydrogen bond interactions, whereas peptides with very low permeability have low lipophilicity or many solvent interactions. Our model is supported by mol. dynamics simulations of the cyclic peptides calculated in explicit solvent, providing a structural basis for the observed correlations. This prospective exploration into biomarkers of peptide permeability has the potential to unlock wider opportunities for development of peptides into drugs.

European Journal of Medicinal Chemistry published new progress about 77128-73-5. 77128-73-5 belongs to ethers-buliding-blocks, auxiliary class Inhibitor, name is (S)-2-((((9H-Fluoren-9-yl)methoxy)carbonyl)(methyl)amino)-3-phenylpropanoic acid, and the molecular formula is C12H13F2N3O4S, Application of (S)-2-((((9H-Fluoren-9-yl)methoxy)carbonyl)(methyl)amino)-3-phenylpropanoic acid.

Referemce:
https://en.wikipedia.org/wiki/Ether,
Ether | (C2H5)2O – PubChem

Raghavan, Sadagopan published the artcileA short convergent synthesis of the [3.2.1]dioxabicyclooctane subunit of sorangicin A via regioselective epoxide opening, Name: (+)-B-Methoxydiisopinocampheylborane, the publication is Tetrahedron (2018), 74(10), 1071-1077, database is CAplus.

In this paper, we disclose the synthesis of the dioxabicyclo[3.2.1]octane subunit (I) of the potent antibiotic sorangicin A. The synthesis was achieved in a convergent manner in 8 steps. Regio- and stereoselective intermol. epoxide opening, ring-closing metathesis and iodo-etherification are key steps. cis-2-Butene diol has been employed as a common staring material.

Tetrahedron published new progress about 99438-28-5. 99438-28-5 belongs to ethers-buliding-blocks, auxiliary class Chiral,Aliphatic cyclic hydrocarbon, name is (+)-B-Methoxydiisopinocampheylborane, and the molecular formula is C21H37BO, Name: (+)-B-Methoxydiisopinocampheylborane.

Referemce:
https://en.wikipedia.org/wiki/Ether,
Ether | (C2H5)2O – PubChem

Chupka, E. I. published the artcileCalculation of electron structures of some guaiacylpropane series compounds using the MO-LCAO method, Product Details of C10H14O, the publication is Sovrem. Metody Issled. Khim. Lignina (1970), 52-7, database is CAplus.

Electron structure of guaiacylpropane compounds was studied for the Me groups by the simple Hueckel method with the use of a heteroatom model. Charges on atoms, bond orders, and free valence indexes are presented. The direction of electrophilic substitution for the systems and their comparative acidities were discussed.

Sovrem. Metody Issled. Khim. Lignina published new progress about 2944-47-0. 2944-47-0 belongs to ethers-buliding-blocks, auxiliary class Benzene,Ether, name is 2-Isopropylanisole, and the molecular formula is C10H14O, Product Details of C10H14O.

Referemce:
https://en.wikipedia.org/wiki/Ether,
Ether | (C2H5)2O – PubChem

Trost, Barry M. published the artcileTotal Synthesis and Stereochemical Assignment of (-)-Ushikulide A, Safety of (+)-B-Methoxydiisopinocampheylborane, the publication is Journal of the American Chemical Society (2009), 131(41), 15061-15074, database is CAplus and MEDLINE.

We report the determination of the full stereostructure of (-)-ushikulide A (I), a spiroketal containing macrolide by total synthesis. Ushikulide A was isolated from a culture broth of Streptomyces sp. IUK-102 and exhibits potent immunosuppressant activity (IC₅₀ = 70 nM). To embark upon an ushikulide A synthesis, a tentative assignment was made based on analogy to cytovaricin, a related macrolide isolated from a culture of Streptomyces diastatochromogenes whose full structure was previously established via synthesis and X-ray crystallog. This report delineates studies on several key steps, namely a direct aldol reaction catalyzed by the dinuclear zinc ProPhenol complex, a metal catalyzed spiroketalization, as well as application of an unprecedented asym. alkynylation of a simple saturated aldehyde with Me propiolate to prepare the nucleophilic partner for a Marshall-Tamaru propargylation. These studies culminated in the first total synthesis and stereochem. assignment of (-)-ushikulide A and significantly extended the scope of the above-mentioned methodologies.

Journal of the American Chemical Society published new progress about 99438-28-5. 99438-28-5 belongs to ethers-buliding-blocks, auxiliary class Chiral,Aliphatic cyclic hydrocarbon, name is (+)-B-Methoxydiisopinocampheylborane, and the molecular formula is C15H21BO2, Safety of (+)-B-Methoxydiisopinocampheylborane.

Referemce:
https://en.wikipedia.org/wiki/Ether,
Ether | (C2H5)2O – PubChem

Ledovskikh, V. M. published the artcilePolarographic study of the reaction of thiourea with copper(II) sulfate, COA of Formula: C2H8Cl2N4S2, the publication is Zhurnal Obshchei Khimii (1976), 46(1), 11-15, database is CAplus.

Results are given on the reaction of thiourea [62-56-6] and some of its derivatives with CuSO4 [7758-98-7] in H2SO4 solutions by using the polarog. method. The anomalous behavior can be explained by the presence of highly surface-active complexes of Cu(I) with thiourea. The thiourea and its derivatives is oxidized by the Cu(II) ion to form the appropriate formamidine disulfide, together with complexes of the original substance with Cu(I). Quant. determination of the products of the reaction are possible by polarog. The presence in the H2SO4 electrolyte of Cu compounds of the disulfide class is a necessary condition for the brightening action of dimethylolthiourea [3084-25-1] and its dialkyl esters.

Zhurnal Obshchei Khimii published new progress about 14807-75-1. 14807-75-1 belongs to ethers-buliding-blocks, auxiliary class Salt,Thiourea,Amine,Aliphatic hydrocarbon chain, name is Formamidine disulfide dihydrochloride, and the molecular formula is C2H8Cl2N4S2, COA of Formula: C2H8Cl2N4S2.

Referemce:
https://en.wikipedia.org/wiki/Ether,
Ether | (C2H5)2O – PubChem

Menk, Florian published the artcileReactivity Studies of Alkoxy-Substituted [2.2]Paracyclophane-1,9-dienes and Specific Coordination of the Monomer Repeating Unit during ROMP, Formula: C15H24O2, the publication is Macromolecules (Washington, DC, United States) (2015), 48(20), 7435-7445, database is CAplus.

The polymerization of alkoxy-substituted [2.2]paracyclophane-1,9-dienes via ring-opening metathesis polymerization (ROMP) to obtain soluble poly(p-phenylenevinylene)s is a versatile method due to its living nature which enables the possibility of block copolymerization and end group modification. However, detailed studies on the reactivity behavior and the polymerization process of alkoxy-substituted [2.2]paracyclophane-1,9-dienes have not been reported so far. Herein we present a detailed study on the varying tendencies of the four isomers of dimethoxy-(2-ethylhexyloxy)-[2.2]paracyclophane-1,9-diene to undergo ROMP. Therefore, we carried out polymerization combining all individual isomers with five different metathesis catalysts and collected initiation and propagation kinetics for various combinations. Furthermore, we revealed a specific coordination of the monomer repeating unit to the catalyst during the polymerization process and succeeded to polymerize not only the pseudogeminal isomers but also one of the pseudo-ortho isomers.

Macromolecules (Washington, DC, United States) published new progress about 146370-51-6. 146370-51-6 belongs to ethers-buliding-blocks, auxiliary class Benzene,Ether, name is 1-((2-Ethylhexyl)oxy)-4-methoxybenzene, and the molecular formula is C15H24O2, Formula: C15H24O2.

Referemce:
https://en.wikipedia.org/wiki/Ether,
Ether | (C2H5)2O – PubChem

McClain, Edward J. published the artcileDesign and implementation of a catalytic electron donor-acceptor complex platform for radical trifluoromethylation and alkylation, Synthetic Route of 93-04-9, the publication is ACS Catalysis (2020), 10(21), 12636-12641, database is CAplus.

Electron donor-acceptor (EDA) complexes can controllably generate radicals under mild conditions through selective photoexcitation events. However, unproductive reactivity from fast deactivation of the photoexcited complexes through back electron transfer has slowed the development of EDA complexes in synthetic methodol. Here, we disclose the study of EDA complexes derived from 2-methoxynaphthalene donor and acylated Et isonicotinate N-oxide acceptor that undergo a fast N-O bond fragmentation event upon photoexcitation. This reaction design not only overcomes the limitations of back electron transfer but also enables regeneration of the donor species, representing a rare example of EDA photochem. in a catalytic regime. The synthetic utility is demonstrated through visible light-driven radical trifluoromethylation and Minisci alkylation reactions. The scalability of the EDA complex-promoted reaction is evidenced by the successful multigram-scale trifluoromethylation of Me N-Boc pyrrole-2-carboxylate in a continuous flow manifold.

ACS Catalysis published new progress about 93-04-9. 93-04-9 belongs to ethers-buliding-blocks, auxiliary class Naphthalene,Ether, name is 2-Methoxynaphthalene, and the molecular formula is C11H10O, Synthetic Route of 93-04-9.

Referemce:
https://en.wikipedia.org/wiki/Ether,
Ether | (C2H5)2O – PubChem