Category: esters-buliding-blocks

Gao, Xing; Shan, Chunhui; Chen, Zhihao; Liu, Yan; Zhao, Xia; Zhang, Ao; Yu, Peng; Galons, Herve; Lan, Yu; Lu, Kui published the artcile< One-pot synthesis of β-lactams by the Ugi and Michael addition cascade reaction>, Application In Synthesis of 112-63-0, the main research area is lactam beta preparation chemoselective diastereoselective; heterocyclic aldehyde amine isocyanide maleic fumaric acid; tandem Ugi Michael addition.

Synthesis of β-lactams I (R1 = COOMe, COOEt; R2 = n-Pr, 4-MeC6H4, 4-O2NC6H4, 4-ClC6H4; R3 = COOEt, COPh, 2-pyridyl, etc.; R4 = n-Bu, t-Bu, c-hexyl, Bn) was achieved via Ugi/Michael reaction cascades under mild conditions. The intramol. hydrogen bonding between the heteroatom from an aldehyde component and the amide NH group controls the chemoselectivity of the Michael reaction vs. the aza-Michael reaction. DFT calculation was performed to clarify the mechanism, chemo-selectivity and diastereoselectivity of this work. This one-pot protocol offers a straightforward method to build a diversified β-lactam library for drug discovery.

Organic & Biomolecular Chemistry published new progress about Aldehydes Role: RCT (Reactant), RACT (Reactant or Reagent). 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, Application In Synthesis of 112-63-0.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Iliyasov, Taigib M.; Karpenko, Kirill A.; Akulinin, Alexander S.; Fakhrutdinov, Artem N.; Korolev, Viktor A.; Elinson, Michail N.; Vereshchagin, Anatoly N. published the artcile< Stereoselective one-pot five-component synthesis of polysubstituted 1,4,5,6-tetrahydropyridines with two and three stereocenters>, Name: Ethyl 3-oxo-3-phenylpropanoate, the main research area is polysubstituted tetrahydropyridine preparation stereoselective; aldehyde ester oxocarboxylic acid one pot five component reaction.

A novel five-component stereoselective synthesis of polysubstituted tetrahydropyridines is reported. The Knoevenagel condensation – Michael addition – Mannich reaction – cyclization – dehydration cascade of aldehydes, esters of 3-oxocarboxylic acids C-H acids and ammonium acetate provides convenient access to 2-substituted alkyl (4SR,6RS)-4,6-diaryl-5,5-dicyano-1,4,5,6-tetrahydropyridine-3-carboxylates with two stereocenters and 3,5-dialkyl (4RS,5SR,6RS)-5-cyano-2,4,6-triaryl-1,4,5,6-tetrahydropyridine-5,3-carboxylates with three stereocenters in 57-84% yields. It was established that formation of products proceeds via substituted 2-hydroxypiperidines with four stereocenters. Ammonium acetate plays a dual role, acting as a base and as a nitrogen source. Five bonds are formed as a result of multicomponent process. The formation of single diastereomers was confirmed by singe crystal X-ray diffraction studies and 2D-NMR spectroscopy.

ARKIVOC (Gainesville, FL, United States) published new progress about Aldehydes Role: RCT (Reactant), RACT (Reactant or Reagent). 94-02-0 belongs to class esters-buliding-blocks, and the molecular formula is C11H12O3, Name: Ethyl 3-oxo-3-phenylpropanoate.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Huang, Long; Wei, Yin; Shi, Min published the artcile< Asymmetric substitutions of O-Boc-protected Morita-Baylis-Hillman adducts with pyrrole and indole derivatives>, Safety of (9Z,12Z)-Methyl octadeca-9,12-dienoate, the main research area is Boc Morita Baylis Hillman adduct pyrrole indole asym substitution.

An efficient asym. substitution process of O-Boc-protected Morita-Baylis-Hillman adducts with various pyrrole and indole derivatives has been developed in the presence of (DHQD)2PYR in THF, affording the corresponding products, e.g. I, in good to high yields (up to 99% yield) and moderate to high ee values (up to 92 and 96% ee) under mild conditions.

Organic & Biomolecular Chemistry published new progress about Enantioselective synthesis. 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, Safety of (9Z,12Z)-Methyl octadeca-9,12-dienoate.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Palomba, Martina; Sancineto, Luca; Marini, Francesca; Santi, Claudio; Bagnoli, Luana published the artcile< A domino approach to pyrazino-indoles and -pyrroles using vinyl selenones>, Category: esters-buliding-blocks, the main research area is indolecarboxamide pyrrolocarboxamide chemoselective regioselective Michael reaction cyclization vinyl selenone; pyrazinoindolone dihydro preparation; pyrrolopyrazinone dihydro preparation.

An efficient and flexible approach to biol. relevant 3,4-dihydropyrazino[1,2-a]indol-1(2H)ones I [R1 = H, F, Cl, MeO, R2 = H; R1 = R2 = MeO; R3 = n-Bu, Ph, PhCH2, (R)-PhCHMe, etc.; R4 = H, Me, n-Bu, n-hexyl] and 3,4-dihydropyrrolo[1,2-a]pyrazin-1(2H)ones through a domino Michael/intramol. nucleophilic substitution pathway using potassium hydroxide in dichloromethane is disclosed. Variously substituted vinyl selenones R4CH:CHSeO2Ph and 1H-indole-2-carboxamides II or 1H-pyrrole-2-carboxamides were employed with success in chemo- and regioselective processes. The introduction of an amino acid portion on the amidic function is well tolerated without racemization.

Tetrahedron published new progress about Aromatic amides Role: RCT (Reactant), SPN (Synthetic Preparation), RACT (Reactant or Reagent), PREP (Preparation). 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, Category: esters-buliding-blocks.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Yao, Tianwen; Su, Wenxiang; Han, Shisheng; Lu, Yan; Xu, Yanqiu; Chen, Min; Wang, Yi published the artcile< Recent advances in traditional Chinese medicine for treatment of podocyte injury>, COA of Formula: C19H34O2, the main research area is review podocyte injury traditional Chinese medicine treatment; active ingredient; acupuncture and moxibustion; compound prescription; herbs; podocyte injury; traditional Chinese medicine.

A review. Podocyte is also called glomerular epithelial cell, which has been considered as the final gatekeeper of glomerular filtration barrier (GFB). As a major contributor to proteinuria, podocyte injury underlies a variety of glomerular diseases and becomes the challenge to patients and their families in general. At present, the therapeutic methods of podocyte injury mainly include angiotensin-converting enzyme inhibitors or angiotensin receptor blockers, steroid and immunosuppressive medications. Nevertheless, the higher cost and side effects seriously disturb patients with podocyte injury. Promisingly, traditional Chinese medicine (TCM) has received an increasing amount of attention from different countries in the treatment of podocyte injury by invigorating spleen and kidney, clearing heat and eliminating dampness, as well enriching qi and activating blood. Therefore, we searched articles published in peer-reviewed English-language journals through Google Scholar, PubMed, Web of Science, and Science Direct. The protective effects of active ingredients, herbs, compound prescriptions, acupuncture and moxibustion for treatment of podocyte injury were further summarized and analyzed. Meanwhile, we discussed feasible directions for future development, and analyzed existing deficiencies and shortcomings of TCM in the treatment of podocyte injury. In conclusion, this paper shows that TCM treatments can serve as promising auxiliary therapeutic methods for the treatment of podocyte injury.

Frontiers in Pharmacology published new progress about Abelmoschus manihot. 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, COA of Formula: C19H34O2.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Critcher, Douglas; Pattenden, Gerald published the artcile< Synthetic studies towards pateamine, a novel thiazole-based 19-membered bis-lactone from Mycale sp>, Reference of 617-55-0, the main research area is pateamine lactone preparation.

A concise synthesis of the 19-membered bis-lactone core I present in pateamine using chiral pool starting materials and featuring an intramol. Stille coupling reaction as a key stratagem, is described.

Tetrahedron Letters published new progress about 617-55-0. 617-55-0 belongs to class esters-buliding-blocks, and the molecular formula is C6H10O5, Reference of 617-55-0.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Wimmer, Eric; Borghese, Sophie; Blanc, Aurelien; Beneteau, Valerie; Pale, Patrick published the artcile< Zeolite-Based Organic Synthesis (ZeoBOS) of Acortatarin A: First Total Synthesis Based on Native and Metal-Doped Zeolite-Catalyzed Steps>, Reference of 7126-50-3, the main research area is acortatarin A total synthesis zeolite organic synthesis; spiroketalization silver zeolite catalyst total synthesis acortatarin A; cross coupling copper zeolite catalyst total synthesis acortatarin A; copper; doped-zeolite; silver; spiroketalization; ynamide formation.

Similarly to polymer-supported assisted synthesis (PSAS), organic synthesis could be envisaged being performed by using zeolites, native or metal-doped, as heterogeneous catalysts. To illustrate this unprecedented Zeolite-Based Organic Synthesis (ZeoBOS), the total synthesis of acortatarin A (I) was achieved through a novel strategy and using five out of eleven synthetic steps catalyzed by H- or metal-doped zeolites as catalysts. Notably, the formation of an yne-pyrrole intermediate with a copper-doped zeolite and the spiroketalization of an alkyne diol with a silver-doped zeolite have been developed as key steps of the synthesis.

Chemistry – A European Journal published new progress about Cross-coupling reaction. 7126-50-3 belongs to class esters-buliding-blocks, and the molecular formula is C8H9NO3, Reference of 7126-50-3.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Pratika, Remi Ayu; Wijaya, Karna; Trisunaryanti, Wega published the artcile< Hydrothermal treatment of SO4/TiO2 and TiO2/CaO as heterogeneous catalysts for the conversion of Jatropha oil into biodiesel>, Safety of (9Z,12Z)-Methyl octadeca-9,12-dienoate, the main research area is titania sulfur calcium oxide catalyst hydrothermal treatment Jatrophaoil biodiesel.

The conversion of Jatropha oil into biodiesel has been conducted using the SO4/TiO2 acid and TiO2/CaO base catalysts via hydrothermal treatment using an autoclave reactor. The acid catalyst was prepared with the sulfation process of TiO2 using H2SO4 (0.5; 0.8; 1.1; 1.4; 1.7 and 2 M). The base catalyst was initiated by dispersing TiO2 (1, 5, 10, 15, and 20 wt%) on CaO. The aims of this research were to obtain the catalyst with the highest acidity and basicity from SO4/TiO2 acid and TiO2/CaO catalysts, resp. Afterward, apply them to the esterification to reduce the free fatty acid of Jatropha oil and the transesterification of the esterified of Jatropha oil into biodiesel. Among the SO4/TiO2 catalysts, the ST-2-400 catalyst exhibits an optimum total acidity of 6.93 mmol NH3/g. This catalyst was able to reduce the FFA level of Jatropha oil from 1.22% to 0.59% with catalyst weight of 3%, ratio oil to methanol of 1:15, and reaction time of 90 min. The optimum total basicity from TiO2/CaO catalysts was achieved by TC-20-800 with the total basicity of 28.67 mmol HCl/g. The conversion of esterified Jatropha oil into biodiesel was performed using 3% of TC-20-800 catalyst at 65°C for 90 min. The TC-20-800 catalyst was able to produce biodiesel up to 79.68%.

Journal of Environmental Chemical Engineering published new progress about Acid number. 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, Safety of (9Z,12Z)-Methyl octadeca-9,12-dienoate.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Tran-Thi, T.-H.; Prayer, C.; Millie, Ph.; Uznanski, P.; Hynes, James T. published the artcile< Substituent and Solvent Effects on the Nature of the Transitions of Pyrenol and Pyranine. Identification of an Intermediate in the Excited-State Proton-Transfer Reaction>, Product Details of C19H34O2, the main research area is solvent effect electronic transition pyrenol pyranine intermediate proton transfer; substituent effect electronic transition pyrenol pyranine intermediate proton transfer.

A comparative study of pyrenol and its trisulfonated derivative, pyranine, is undertaken to provide new clues for the understanding of the excited-state proton-transfer reaction (ESPT) of hydroxyarenes (ArOH*). A particular goal is to elucidate the nature of a transient intermediate involved in a three step mechanism of ESPT, as recently revealed in a dynamical study of excited pyranine in water. The present focus is on the reactant side, before the proton transfer occurs, and particular attention is given to the anal. of the nature of the electronic transitions and to the solute-solvent interactions in the ground and excited states of the ArOHs. Using both quantum chem. calculations and solvatochromism analyses, both (a) the role of electron-withdrawing substituents and H-bond interaction with the solvent in stabilizing the two lowest excited states, 1Lb and 1La, and (b) their relevance to the inversion of these two states are studied. The results allow the identification of the intermediate species in the three step mechanism of the ESPT of excited pyranine in water as a 1La state acid form, with appreciable charge-transfer character, as distinct from the 1Lb acid form reached in absorption. The results, which differ from more standard pictures of ESPT, are discussed within the perspective of a three valence bond form model for the ESPT process.

Journal of Physical Chemistry A published new progress about AM1 (molecular orbital method). 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, Product Details of C19H34O2.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Sheppard, George S.; Wang, Jieyi; Kawai, Megumi; Fidanze, Steve D.; BaMaung, Nwe Y.; Erickson, Scott A.; Barnes, David M.; Tedrow, Jason S.; Kolaczkowski, Lawrence; Vasudevan, Anil; Park, David C.; Wang, Gary T.; Sanders, William J.; Mantei, Robert A.; Palazzo, Fabio; Tucker-Garcia, Lora; Lou, Pingping; Zhang, Qian; Park, Chang H.; Kim, Ki H.; Petros, Andrew; Olejniczak, Edward; Nettesheim, David; Hajduk, Phillip; Henkin, Jack; Lesniewski, Richard; Davidsen, Steven K.; Bell, Randy L. published the artcile< Discovery and Optimization of Anthranilic Acid Sulfonamides as Inhibitors of Methionine Aminopeptidase-2: A Structural Basis for the Reduction of Albumin Binding>, COA of Formula: C19H34O2, the main research area is anthranilic acid sulfonamide derivative preparation methionine aminopeptidase inhibitor albumin.

Methionine aminopeptidase-2 (MetAP2) is a novel target for cancer therapy. As part of an effort to discover orally active reversible inhibitors of MetAP2, a series of anthranilic acid sulfonamides with micromolar affinities for human MetAP2 were identified using affinity selection by mass spectrometry (ASMS) screening. These micromolar hits were rapidly improved to nanomolar leads on the basis of insights from protein crystallog.; however, the compounds displayed extensive binding to human serum albumin and had limited activity in cellular assays. Modifications based on structural information on the binding of lead compounds to both MetAP2 and domain III of albumin allowed the identification of compounds with significant improvements in both parameters, which showed good cellular activity in both proliferation and methionine processing assays.

Journal of Medicinal Chemistry published new progress about Antitumor agents. 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, COA of Formula: C19H34O2.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics