Tag: M.W=150-200

Christopher, John A.; Kocienski, Philip J.; Kuhl, Alexander; Bell, Richard published the artcile< A synthesis of cryptophycin 4 using a planar chiral molybdenum cationic complex>, Application In Synthesis of 617-55-0, the main research area is cryptophycin 4 asym synthesis.

A synthesis of cytotoxic agent Cryptophycin 4 features a new approach to (5S,6R)-5-hydroxy-6-methyl-8-phenyl-(2E,7E)-dienoic acid in which the anti stereochem. between two stereogenic centers is secured by addition of a 1,3-dioxan-4-ylcopper(I) reagent to a planar chiral Mo cationic complex.

Synlett published new progress about Stereoselective synthesis. 617-55-0 belongs to class esters-buliding-blocks, and the molecular formula is C6H10O5, Application In Synthesis of 617-55-0.

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

Basso, Alessandra; Braiuca, Paolo; Ebert, Cynthia; Gardossi, Lucia; Linda, Paolo; Benedetti, Fabio published the artcile< GRID/tetrahedral intermediate computational approach to the study of selectivity of penicillin G acylase in amide bond synthesis>, Safety of Methyl 2-(2-nitrophenyl)acetate, the main research area is penicillin G acylase selectivity active site tetrahedral intermediate.

Mol. modeling was used to investigate the catalytic site of penicillin G acylase (PGA) by building up a simple enzyme-ligand model able to describe and predict the enzyme selectivity. The investigation was based on a double computational approach: first, the GRID computational procedure was applied to gain a qual. description of the chem. features of the PGA active site; second, a classical “”transition state approach”” was used to simulate the tetrahedral intermediates and to evaluate their energies. GRID calculations employed different probes which gave a complete description of the chem. interactions occurring upon binding of different ligands, thus indicating those structures having good affinity with the active site of the enzyme. Tetrahedral intermediates were constructed on the basis of GRID results and provided both geometrical features and energies of enzyme-substrate interaction. Such energies were compared to exptl. kinetic data obtained in the enzymic acylation of L-phenylglycine Me ester using various Me phenylacetate derivatives The good agreement of computational results with exptl. evidence demonstrates the validity of the model as a rapid and flexible tool to describe and predict the enzyme selectivity.

Biochimica et Biophysica Acta, Proteins and Proteomics published new progress about Enzyme functional sites, active. 30095-98-8 belongs to class esters-buliding-blocks, and the molecular formula is C9H9NO4, Safety of Methyl 2-(2-nitrophenyl)acetate.

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

Wu, Binyu; Wen, Xiaolu; Chen, Hongbing; Hu, Lin published the artcile< N-Nosyl-O-bromoethyl hydroxylamine acts as a multifunctional formaldehyde, formaldimine, and 1,2-oxazetidine surrogate for C-C and C-O bond-forming reactions>, Application of C11H12O3, the main research area is aminomethyl ketone preparation; nosyl bromoethyl hydroxylamine benzoyl acetate bond formation; hydroxymethyl ketone preparation; hydroxy ketone nosyl bromoethyl hydroxylamine bond formation; carboxylate indanone hydroxymethyl preparation enantioselective chemoselective; alkoxyl indanone carboxylate preparation enantioselective chemoselective; indanone carboxylate bond formation Mannich chiral catalyst.

N-Nosyl-O-bromoethyl hydroxylamine, a bench stable solid, could function as a novel formaldehyde, formaldimine and 1,2-oxazetidine surrogate under DBU basic conditions were described. By merely using this simple reagent, a broad range of synthetically useful β-aminomethyl ketones I [R1 = Me, Ph, 2-furyl, etc.; R2 = Me, Et, allyl, Bn; R1R2 = (CH2)3, (CH2)4, (CH2)5, etc.; R3 = Ac, CO2Me, CO2Et, SO2Ph] and α-hydroxymethyl ketones II [R4 = Me, Et, allyl, Bn; Q = (CH2)n, n = 1,2], as well as chiral α-alkoxyl indanone carboxylates III [R5 = H, 4-MeO, 5-F, etc.; X = OCH2CH2] and α-aminomethyl indanone carboxylates III [X = CH2] could be divergently obtained via chemo- and stereoselective aldol, Mannich or umpolung C-O bond-forming reactions. The challenging catalytic asym. Mannich reaction of formaldimine equivalent was also realized with moderate enantioselectivities.

Organic Chemistry Frontiers published new progress about Bond formation. 94-02-0 belongs to class esters-buliding-blocks, and the molecular formula is C11H12O3, Application of C11H12O3.

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

Han, Chunyu; Tian, Xianhai; Song, Lina; Liu, Yaowen; Hashmi, A. Stephen K. published the artcile< Tetra-substituted furans by a gold-catalysed tandem C(sp3)-H alkynylation/oxy-alkynylation reaction>, Recommanded Product: Ethyl 3-oxo-3-phenylpropanoate, the main research area is THF preparation; ketone hypervalent iodine reagent tandem alkynylation oxyalkynylation.

A gold-catalyzed cascade C(sp3)-H alkynylation/oxy-alkynylation of acceptor-substituted carbonyl compounds with hypervalent iodine(III) reagents for the synthesis of tetra-substituted furans is described. This reaction involves two Au(I)/Au(III) catalytic cycles and proceeds through a C(sp3)-H alkynylation of a substituted ketone and a subsequent oxy-alkynylation of the generated 2-alkynyl ketone. This mild and simple method can tolerate a wide range of functionalities, offering distinct advantages over previous methods using PIDA as the external oxidant. Furthermore, a gram-scale synthesis is feasible and the synthesized furan product was readily transformed into other related compounds

Organic Chemistry Frontiers published new progress about Alkynylation. 94-02-0 belongs to class esters-buliding-blocks, and the molecular formula is C11H12O3, Recommanded Product: Ethyl 3-oxo-3-phenylpropanoate.

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

Fobi, Kwabena; Bunce, Richard A. published the artcile< Domino Nitro Reduction-Friedlander Heterocyclization for the Preparation of Quinolines>, Name: Ethyl 3-oxo-3-phenylpropanoate, the main research area is quinoline preparation; aminobenzaldehyde activated ketone domino nitro reduction Friedlander heterocyclization; Friedländer synthesis; dissolving metal reduction; domino reaction; heterocyclization; quinolin-2(1H)-ones; quinolines.

The Friedlander synthesis offers efficient access to substituted quinolines from 2-aminobenzaldehydes and activated ketones in the presence of a base. The disadvantage of this procedure lies in the fact that relatively few 2-aminobenzaldehyde derivatives are readily available. To overcome this problem, authors report a modification of this process involving the in situ reduction of 2-nitrobenzaldehydes with Fe/AcOH in the presence of active methylene compounds (AMCs) to produce substituted quinolines in high yields. The conditions are mild enough to tolerate a wide range of functionality in both reacting partners and promote reactions not only with Ph and benzyl ketones, but also with β-keto-esters, β-keto-nitriles, β-keto-sulfones and β-diketones. The reaction of 2-nitroarom. ketones with unsym. AMCs is less reliable, giving a competitive formation of substituted quinolin-2(1H)-ones from the cyclization of the Z Knoevenagel intermediate which appears to be favored when certain large groups are adjacent to the AMC ketone carbonyl.

Molecules published new progress about Benzaldehydes Role: RCT (Reactant), RACT (Reactant or Reagent) (nitro). 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

Walker, Jeffery W.; Martin, Hunter; Schmitt, Frederick R.; Barsotti, Robert J. published the artcile< Rapid release of an α-adrenergic receptor ligand from photolabile analogs>, Formula: C9H9NO4, the main research area is alpha adrenergic receptor agonist photorelease; phenylephrine analog photorelease adrenergic receptor.

A series of 2-nitrobenzyl derivatives of the α1-selective adrenergic agonist, L-phenylephrine [(R)-N-[2-(3-hydroxyphenyl)-2-hydroxyethyl]-N-methylammonium chloride], were synthesized and characterized for the purpose of developing biol. inert compounds that can be rapidly converted to L-phenylephrine by near-UV irradiation The compounds, derivatized on the phenolic oxygen, were O-(1-(2-nitrophenyl)ethyl)phenylephrine (I), O-(2-nitrobenzyl)phenylephrine (II), O-(4,5-dimethoxy-2-nitrobenzyl)phenylephrine (III), and O-(α-carboxyl-2-nitrobenzyl)phenylephrine (IV). All 4 compounds photolyzed to free phenylephrine following a brief exposure to 300-350-nm light or 347-nm laser light with steady-state quantum yields ranging from 0.05 to 0.28. The rates of phenylephrine formation on photolysis were estimated from the decay rates of aci-nitro intermediates detected by absorbance between 380 and 500 nm. IV displayed the highest quantum yield (0.28) and most rapid photolysis rate (1980 s-1) measured under near physiol. conditions, pH 8.0, 22°. Biol. properties of the compounds were examined in smooth muscle from rat caudal artery. Laser pulse photolysis of IV at 347 nm initiated a maximal contraction in Krebs buffer, pH 7.1, 25°, that mimicked the response to 50 μM phenylephrine but was faster in onset. Photoinitiated contractions were characterized by a delay of 0.93 s followed by a rising phase with a 10-90% rise time of 3.56 s. Responses were fully blocked by the α1-selective antagonist prazosin. Similar results were obtained using I-III, but a slowly developing sustained phase of smooth muscle contraction was altered in the presence of I-III. IV represents a useful new biol. inactive caged phenylephrine that should facilitate temporally and spatially resolved studies of α1-adrenergic receptor mechanisms in cells and tissues.

Biochemistry published new progress about Caudal artery. 30095-98-8 belongs to class esters-buliding-blocks, and the molecular formula is C9H9NO4, Formula: C9H9NO4.

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

Mingoia, Francesco published the artcile< Reactivity of 5-(3-azidophenyl)-1-(1H-pyrrol-3-yl)pyrroles in TFMSA. A route for new ring systems as DNA-interactive agents>, Formula: C7H10N2O2, the main research area is azidophenyl pyrrolylpyrrole preparation cyclization; dipyrroloisoquinoline preparation DNA interactive agent.

Acid catalyzed decomposition of 5-(3-azidophenyl)-1-(1H-pyrrol-3-yl)pyrroles did not afford the expected dipyrrolo[2,1-a:3,4-c]isoquinoline derivatives, but the planar dipyrrolo[2,1-a:3,2-c]isoquinoline derivatives and related non planar derivatives H-dipyrrolo[2,1-a:3,2-c]isoquinoline derivatives In strong acid media (trifluoromethanesulfonic acid) the α-(1-pyrrol-3-yl) position even if blocked, was more prone to undergo cyclization with respect to the free β one. Despite the steric hindrance, these compounds were obtained in moderate to good overall yields, depending on the nature and position of the substituents on the 1-(1H-pyrrolyl) moiety.

Tetrahedron published new progress about DNA Role: MSC (Miscellaneous). 252932-48-2 belongs to class esters-buliding-blocks, and the molecular formula is C7H10N2O2, Formula: C7H10N2O2.

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

Kurt, Adnan; Koca, Murat published the artcile< Synthesis, characterization and thermal degradation kinetics of pyrazole derived methacrylate polymer, poly(1,3-diphenyl-1H-pyrazol-5-Yl methacrylate)>, Application In Synthesis of 94-02-0, the main research area is polydiphenyl pyrazol methacrylate preparation thermal degradation activation energy; Pyrazole derived polymer; activation energy; reaction mechanism; synthesis and characterization; thermal degradation kinetics.

Since the behavior and properties of macromol. pyrazole derived polymers differ from their small mols., such polymers are in the class of well-defined functional polymers due to the fact that the pyrazole ring contains two π-bonds as well as two hetero atoms in its structure, and this feature makes them important in the fields of scientific and technol. applications. In present study, therefore, we synthesized a new pyrazole derived methacrylate monomer, 1,3-diphenyl-1H-pyrazol-5-yl methacrylate, from the reaction of 1,3-diphenyl-5-pyrazolone with methacryloyl chloride in the presence of triethylamine. After that, its homopolymerization was carried out by free radical polymerization method at 60°C initiated with benzoyl peroxide. Spectral characterizations were achieved by 1H-NMR and FTIR spectroscopies. The kinetics of thermal degradation of the new polymer, poly(1,3-diphenyl-1H-pyrazol-5-yl methacrylate), poly(DPPMA), were investigated by thermogravimetric anal. (TGA) at different heating rates. The initial decomposition temperature of the polymer changed from 216.3°C to 243.5°C depending on the increasing heating rate. The thermal decomposition activation energies in a conversion range of 7-19% were 79.45 kJ/mol and 81.56 kJ/mol by the Flynn-Wall-Ozawa and Kissinger methods, resp. Thermodegrdn. mechanism of the poly(DPPMA) were investigated in detail by using different kinetic methods available in the literature such as Coats-Redfern, Tang, Madhusudanan and Van Krevelen. Among all these methods, the best result was obtained for Coats-Redfern method (E = 90.93 kJ/mol) at the optimum heating rate of 15°C/min for D1 mechanism that is a one-dimensional diffusion type deceleration mechanism.

Acta Chimica Slovenica published new progress about Activation energy. 94-02-0 belongs to class esters-buliding-blocks, and the molecular formula is C11H12O3, Application In Synthesis of 94-02-0.

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

Shetgaonkar, Abhijit D.; Nadkarni, Vishnu S. published the artcile< Synthetically Induced 1→4-C Branching Motif - An Access Towards Dense Urethane Connecting Dendritic Scaffolds and Application in Nuclear Track Detection>, Safety of tert-Butyl diallylcarbamate, the main research area is urethane connecting polyoleifinic dendrimer preparation nuclear track detection.

A series of dumbbell-shaped urethane connecting polyoleifinic dendrimers, are synthesized from com. AB2 monomer through the concept of post-generative synthetic induction of novel 1→4-C branching motif in divergent and convergent growth methodol. using carbamoyl chloride reactivity. A synthetic protocol is conducted through the iterative process of O-carbamoyl-allylation of hydroxyls followed by Upjohn dihydroxylation of the allylic double bonds, leading to protection/deprotection free divergent pathway. In parallel, convergent growth route gains dendrimers in relatively good yields. Also, the process of O-carbonyloxy-allylation of [G-1] polyol affords urethane-carbonate framework providing access to 1→2-C branching further. Incorporation of current branching motif results in dendritic scaffold with dense periphery at lower generations itself. Free radical cast polymerization of [G-0.5] dendrimer with allyl diglycol carbonate (ADC) produces thermoset polymer films, showing good sensitivity and ability to permanently record nuclear tracks.

ChemistrySelect published new progress about Dendrimers Role: SPN (Synthetic Preparation), PREP (Preparation). 151259-38-0 belongs to class esters-buliding-blocks, and the molecular formula is C11H19NO2, Safety of tert-Butyl diallylcarbamate.

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

Bunce, Richard A.; Herron, Derrick M.; Johnson, Lara B.; Kotturi, Sharadsrikar V. published the artcile< Diastereoselective synthesis of substituted tetrahydroquinoline-4-carboxylic esters by a tandem reduction-reductive amination reaction>, Recommanded Product: Methyl 2-(2-nitrophenyl)acetate, the main research area is cyclization reduction nitrophenylpropanal; tandem reduction reductive amination nitrophenylpropanal; quinolinecarboxylate tetrahydro diastereoselective preparation; diastereoselective preparation tetrahydroquinolinecarboxylate.

A diastereoselective synthesis of cis-1-methyl-2-alkyl-1,2,3,4-tetrahydroquinoline-4-carboxylic acids and cis-2-alkyl-1,2,3,4-tetrahydroquinoline-4-carboxylic esters was developed from Me (2-nitrophenyl)acetate (I). The method involves alkylation of I with an allylic halide, ozonolysis of the double bond, and catalytic hydrogenation. The final hydrogenation initiates a tandem sequence involving reduction of the aromatic nitro group, condensation of the aniline or hydroxylamine nitrogen with the side chain carbonyl group, reduction of the resulting nitrogen intermediate, and reductive amination of the tetrahydroquinoline with formaldehyde produced in the ozonolysis to give a Me (±)-1-methyl-2-alkyl-1,2,3,4-tetrahydroquinoline-4-carboxylate. Removal of the formaldehyde prior to hydrogenation gives the simple (±)-2-alkyl derivatives The products were isolated in high yield as single diastereomers having the C-2 alkyl group cis to the C-4 carboxylic ester. The reaction was extended to the synthesis of tricyclic structures with similar high diastereoselection.

Journal of Organic Chemistry published new progress about Amination (intramol., stereoselective). 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