Tag: M.W=150-200

Palmer, Francine N.; Lach, Franck; Poriel, Cyril; Pepper, Adrian G.; Bagley, Mark C.; Slawin, Alexandra M. Z.; Moody, Christopher J. published the artcile< The diazo route to diazonamide A: studies on the tyrosine-derived fragment>, Application of C9H9NO4, the main research area is diazonamide tyrosine derived fragment preparation.

Various approaches to the tyrosine-derived fragment of the marine secondary metabolite diazonamide A are described. Initial efforts were focused on the originally proposed structure of the natural product, and a feasibility study established that a model 4-aryltryptamine could be readily prepared For example, Boc-protected 4-bromotryptamine underwent Pd(0)-catalyzed coupling with 3-allyl-2-methoxyphenylboronic acid, derived from 2-bromophenyl allyl ether by Claisen rearrangement, O-methylation and lithiation-boration. The resulting biaryl compound I was elaborated into an ä¼?diazo-å°?ketoester II, whose Rh2(OAc)4-catalyzed reaction with Cbz-Val-NH2 gave the desired tryptamine-oxazole III following cyclodehydration of the intermediate ketoamide. Another strategy used Cbz-Tyr-OBu-t to synthesize, in eight steps, tyrosyl benzofuran derivative IV, a potential precursor to the benzofuran ring of the original structure of diazonamide A. Iodination, O-protection and Stille coupling were the key steps in the synthesis of IV.

Organic & Biomolecular Chemistry published new progress about Borylation (coupled with lithiation). 30095-98-8 belongs to class esters-buliding-blocks, and the molecular formula is C9H9NO4, Application of C9H9NO4.

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

Goswami, Prithwish; Cho, Sung Yeon; Park, Jin Hyun; Kim, Woo Hee; Kim, Hyun Jin; Shin, Myoung Hyeon; Bae, Han Yong published the artcile< Efficient access to general ä¼?tertiary amines via water-accelerated organocatalytic multicomponent allylation>, Related Products of 94-02-0, the main research area is tertiary amine preparation; ketone allyl boronic acid ester benzhydrazide multicomponent allylation organocatalyst; ketoester allyl boronic acid ester benzhydrazide multicomponent allylation organocatalyst; allyl boronic acid ester ketoester amine multicomponent allylation organocatalyst.

A tetrasubstituted carbon atom connected by three sp3 or sp2-carbons with single nitrogen, i.e., the ä¼?tertiary amines I [R = n-Pr, CH2CO2Et, Ph, etc.; R1 = Me, Et, n-Pr, etc.], was an essential structure of diverse naturally occurring alkaloids and pharmaceuticals. The synthetic approach toward ATA structures was intricate, therefore, a straightforward catalytic method had remained a substantial challenge. Herein, an efficient water-accelerated organocatalytic allylation to directly access ATA incorporating homoallylic amine structures I by exploiting readily accessible general ketones/keto esters as useful starting material along with allyl boronic acid esters and benzhydrazide/amines. The synergistic action of a hydrophobic Bronsted acid in combination with a squaramide hydrogen-bonding donor under aqueous condition enabled the facile formation of the desired moiety I. The developed exceptionally mild but powerful system facilitated a broad substrate scope and enabled efficient multi-gram scalability.

Nature Communications published new progress about Allylation. 94-02-0 belongs to class esters-buliding-blocks, and the molecular formula is C11H12O3, Related Products of 94-02-0.

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

Feng, Sitian; Tang, Yitian; Yang, Chenjue; Shen, Chaoren; Dong, Kaiwu published the artcile< Synthesis of Enantioenriched ä¼?ä¼?Difluoro-å°?arylbutanoic Esters by Pd-Catalyzed Asymmetric Hydrogenation>, Related Products of 94-02-0, the main research area is aryldifluorobutanoate enantioselective preparation; palladium catalyst enantioselective hydrogenation aryldifluorobutenoate.

Synthesis of optically active gem-difluorinated organic mols. attracts a great deal of interest due to their unique properties in pharmaceutical and agrochem. areas. Herein, a series of enantioenriched ��difluoro-�arylbutanoic esters such as (S)-(-)-4-PhC6H4CHMeCF2CO2Et were prepared in high yields (83-99%) with moderate to excellent enantioselectivities (�7:3 er) by palladium-catalyzed asym. hydrogenation.

Organic Letters published new progress about Enantioselective synthesis. 94-02-0 belongs to class esters-buliding-blocks, and the molecular formula is C11H12O3, Related Products of 94-02-0.

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

Lu, Guan-Han; Huang, Tzu-Chia; Hsueh, Hsiao-Chin; Yang, Shin-Cherng; Cho, Ting-Wei; Chou, Ho-Hsuan published the artcile< Novel N-transfer reagent for converting ä¼?amino acid derivatives to ä¼?diazo compounds>, Related Products of 30095-98-8, the main research area is diazo dipeptide synthesis isotope thermal decomposition; amino acid nitrogen transfer reagent reaction mechanism.

A novel universal N-transfer reagent for direct and effective transformation of ä¼?amino ketones, acetamides, and esters to the corresponding ä¼?diazo products under mild basic conditions has been developed. This one-step synthetic approach not only allows for generation of ä¼?substituted-ä¼?diazo carbonyl compounds from ä¼?amino acid derivatives but also permits preparation of ä¼?diazo dipeptides from N-terminal dipeptides (32 examples, up to 91%).

Chemical Communications (Cambridge, United Kingdom) published new progress about Amino acids Role: RCT (Reactant), RACT (Reactant or Reagent). 30095-98-8 belongs to class esters-buliding-blocks, and the molecular formula is C9H9NO4, Related Products of 30095-98-8.

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

Jia, Kaimin; Cao, Ruikai; Hua, Duy H.; Li, Ping published the artcile< Study of Class I and Class III Polyhydroxyalkanoate (PHA) Synthases with Substrates Containing a Modified Side Chain>, Category: esters-buliding-blocks, the main research area is polyhydroxyalkanoate PHA synthase substrate specificity preparation structure activity.

Polyhydroxyalkanoates (PHAs) are carbon and energy storage polymers produced by a variety of microbial organisms under nutrient-limited conditions. They have been considered as an environmentally friendly alternative to oil-based plastics due to their renewability, versatility, and biodegradability. PHA synthase (PhaC) plays a central role in PHA biosynthesis, in which its activity and substrate specificity are major factors in determining the productivity and properties of the produced polymers. However, the effects of modifying the substrate side chain are not well understood because of the difficulty to accessing the desired analogs. In this report, a series of 3-(R)-hydroxyacyl CoA (HACoA) analogs were synthesized and tested with class I synthases from Chromobacterium sp. USM2 (PhaCCs and A479S-PhaCCs) and Caulobacter crescentus (PhaCCc) as well as class III synthase from Allochromatium vinosum (PhaECAv). It was found that, while different PHA synthases displayed distinct preference with regard to the length of the alkyl side chains, they could withstand moderate side chain modifications such as terminal unsaturated bonds and the azide group. Specifically, the specific activity of PhaCCs toward propynyl analog (HHxyCoA) was only 5-fold less than that toward the classical substrate HBCoA. The catalytic efficiency (kcat/Km) of PhaECAv toward azide analog (HABCoA) was determined to be 2.86脳105 M-1 s-1, which was 6.2% of the value of HBCoA (4.62脳106 M-1 s-1) measured in the presence of bovine serum albumin (BSA). These side chain modifications may be employed to introduce new material functions to PHAs as well as to study PHA biogenesis via click-chem., in which the latter remains unknown and is important for metabolic engineering to produce PHAs economically.

Biomacromolecules published new progress about Enzyme inhibition kinetics. 617-55-0 belongs to class esters-buliding-blocks, and the molecular formula is C6H10O5, Category: esters-buliding-blocks.

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

Latxague, Laurent; Patwa, Amit; Amigues, Eric; Barthelemy, Philippe published the artcile< Glycosyl-nucleo-lipids as new bio-inspired amphiphiles>, Category: esters-buliding-blocks, the main research area is endothermic phase transition surface tension glycosyl nucleoside preparation click; glycolipid nucleoside amphiphile fluorocarbon azido thymidine preparation.

Four new Glycosyl-Nucleo-Lipid (GNL) analogs featuring either a single fluorocarbon or double hydrocarbon chains were synthesized in good yields from azido thymidine as starting material. Physicochem. studies (surface tension measurements, differential scanning calorimetry) indicate that hydroxybutanamide-based GNLs feature endothermic phase transition temperatures like the previously reported double chain glycerol-based GNLs. The second generation of GNFs featuring a free nucleobase reported here presents a better surface activity compared to the first generation of GNFs.

Molecules published new progress about 1,3-Dipolar cycloaddition reaction. 617-55-0 belongs to class esters-buliding-blocks, and the molecular formula is C6H10O5, Category: esters-buliding-blocks.

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

Sato, Hiromi; Matsuda, Noriko; Kikuchi, Masao published the artcile< Constituents of Viburnum awabuki>, Category: esters-buliding-blocks, the main research area is Viburnum composition; malate Viburnum; glycoside Viburnum.

Sixteen constituents, including L-4-Me 2-O-methylmalate and glycosides were isolated from V. awabuki.

Natural Medicines (Tokyo) published new progress about Glycosides Role: BSU (Biological Study, Unclassified), PEP (Physical, Engineering or Chemical Process), BIOL (Biological Study), PROC (Process). 617-55-0 belongs to class esters-buliding-blocks, and the molecular formula is C6H10O5, Category: esters-buliding-blocks.

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

Pramanik, Apurba; Karmakar, Joy; Grynszpan, Flavio; Levine, Mindy published the artcile< Highly sensitive water detection through reversible fluorescence changes in a syn-bimane based boronic acid derivative>, HPLC of Formula: 94-02-0, the main research area is bimane boronate ester water fluorescent sensor; bimane; boronate ester; fluorescence; paper-based sensing; water sensor.

Reported herein is a fluorometric and colorimetric sensor for the presence of trace amounts of water in organic solvents, using syn-bimane based boronate ester 1. This sensor responds to the presence of water with a highly sensitive turn-off fluorescence response, with detection limits as low as 0.018% water (volume/volume). Moreover, analogously high performance was observed when compound 1 was adsorbed on filter paper, with the paper-based sensor responding both to the presence of liquid water and to humid atmospheres. Reusability of the paper-based sensor up to 11 cycles was demonstrated, albeit with progressive decreases in the performance, and 1H NMR and mass spectrometry analyses were used to explain the observed, hydrolysis-based sensor response.

Frontiers in Chemistry (Lausanne, Switzerland) published new progress about Colorimetric sensors. 94-02-0 belongs to class esters-buliding-blocks, and the molecular formula is C11H12O3, HPLC of Formula: 94-02-0.

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

Katayama, Seiji; Ae, Nobuyuki; Kodo, Toru; Masumoto, Shuji; Hourai, Shinji; Tamamura, Chika; Tanaka, Hiroyasu; Nagata, Ryu published the artcile< Tricyclic Indole-2-carboxylic Acids: Highly in Vivo Active and Selective Antagonists for the Glycine Binding Site of the NMDA Receptor>, Product Details of C9H9NO4, the main research area is benzindoleacetanilide preparation NMDA receptor antagonist.

A series of tricyclic indole-2-carboxylic acid derivatives were synthesized and evaluated by the radioligand binding assay and the anticonvulsant effects in the mouse NMDA-induced seizure model. Among them, I [R = OCH2CO2H, CH2CO2H, (R)-OCHMeCO2H] showed high affinity to the NMDA-glycine binding site. The absolute configuration of the parent acid was confirmed by X-ray crystallog. anal. In particular, I [R = (R)-CHMeCO2H] was found to be a highly active glycine antagonist for both in vitro and in vivo assays (Ki = 1.0 ± 0.1 nM, ED50 = 2.3 mg/kg, i.v.) and also showed high selectivity for the glycine site. In addition, I [R = (R)-CHMeCO2H] was soluble enough in aqueous media (>10 mg/mL at pH 7.4) to use for medications by i.v. injection.

Journal of Medicinal Chemistry published new progress about NMDA receptors Role: BSU (Biological Study, Unclassified), BIOL (Biological Study). 30095-98-8 belongs to class esters-buliding-blocks, and the molecular formula is C9H9NO4, Product Details of C9H9NO4.

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

You, Jyun-Guo; Jin, Dun-Yuan; Tseng, Wei-Bin; Tseng, Wei-Lung; Lin, Po-Chiao published the artcile< Gold(I)-Thiolate Oligomers for Catalytic Hydrogenation of Nitroaromatics in Aqueous and Organic Medium>, Recommanded Product: Methyl 2-(2-nitrophenyl)acetate, the main research area is gold thiolate oligomer nitroarom catalytic hydrogenation.

Thiolated gold nanoclusters (AuNCs) have been introduced to efficiently and selectively catalyze the hydrogenation of nitroaroms. due to the strong interaction of their S-Au-S staple motifs with the nitro groups of nitroaroms. However, without a gold core, gold(I)-thiolate oligomers (AuSOs) with S-Au-S staple motifs are rarely explored as catalysts for nitroaroms. Here, we report a straightforward strategy for the synthesis of AuSOs through hydroxyl radical-induced leaching of glutathione-capped gold nanoparticles (GSH-AuNPs). Raman spectroscopy and matrix-assisted laser desorption/ionization-time of flight mass spectrometry demonstrated that hydroxyl radical-triggered etching of the GSH-AuNPs resulted in the production of AuSOs, including Au4(GSH)7 and Au7(GSH)9. The AuSOs were found to catalyze NaBH4-mediated hydrogenation of 4-nitrophenol to 4-aminophenol with a chemoselectivity of ∼100 % and a normalized rate constant (Knor) of 4.8×105 s- g-1. In addition to the high affinity of the S-Au-S staple motifs for 4-nitrophenol, the unusual catalytic activity of the AuSOs was attributable to the fact that they efficiently catalyzed the production of H2 from NaBH4 and the reaction of dissolved oxygen and NaBH4. The chemoselectivity and applicability of the AuSOs were further verified by performing the catalytic reaction of Me 2-(2-nitrophenyl) acetate or Me 4-nitrobenzoate with NaBH4.

ChemCatChem published new progress about Binding energy. 30095-98-8 belongs to class esters-buliding-blocks, and the molecular formula is C9H9NO4, Recommanded Product: Methyl 2-(2-nitrophenyl)acetate.

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