Category: esters-buliding-blocks

HPLC of Formula: 41575-94-4. The mechanism of aromatic electrophilic substitution of aromatic heterocycles is consistent with that of benzene. Compound: cis-Diammine(1,1-cyclobutanedicarboxylato)platinum(II), is researched, Molecular C6H12N2O4Pt, CAS is 41575-94-4, about Vinblastine monotherapy induction prior to radiotherapy for patients with intracranial germinoma during the COVID-19 pandemic. Author is Murray, Matthew J.; Moleron, Rafael; Adamski, Jennifer; English, Martin; Burke, G. A. Amos; Cross, Justin; Ajithkumar, Thankamma; Stoneham, Sara; Nicholson, James C..

Patients with localized intracranial germinoma have excellent survival. Reducing treatment burden and long-term sequelae is a priority. Intensive inpatient chemotherapy (e.g., carbo PEI = carboplatin/etoposide/ifosfamide) has been effectively employed to reduce radiotherapy treatment volume/dose. Outpatient-based carboplatin monotherapy is associated with excellent outcomes in metastatic testicular seminoma (an identical pathol.), and successful vinblastine monotherapy induction (with 77% tumor volume reduction after just two weekly vinblastine doses) has recently been reported in an intracranial germinoma patient. Adapted UK guidelines for germ cell tumor management were distributed during the COVID-19 pandemic, including nonstandard treatment options to reduce hospital visits and/or admissions. This included vinblastine monotherapy for intracranial germinoma (6 mg/m2 i.v., or 4 mg/m2 for moderate count suppression, delivered weekly). We describe two such patients treated using this approach. A 30-yr-old male with a localized pineal tumor received 12-wk vinblastine induction, with >60% volume reduction, prior to definitive radiotherapy. A 12-yr-old female with a metastatic suprasellar tumor and progression at all sites of disease while awaiting proton radiotherapy received two vinblastine doses with good early response, including 36% primary tumor volume reduction The patients tolerated vinblastine well. Patients with intracranial germinoma have excellent outcomes, and reduction of late effects remains a priority. The description of vinblastine monotherapy in these intracranial germinoma patients warrants further exploration.

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

SDS of cas: 178396-31-1. Aromatic heterocyclic compounds can also be classified according to the number of heteroatoms contained in the heterocycle: single heteroatom, two heteroatoms, three heteroatoms and four heteroatoms. Compound: 6-Bromo-8-methylquinoline, is researched, Molecular C10H8BrN, CAS is 178396-31-1, about Palladium-Catalyzed Direct α-Ketoesterification of 8-Methylquinoline Derivatives with α-Ketoacids via Dehydrogenation Coupling Reaction. Author is Li, Lesong; Zhang, Feng; Deng, Guo-Jun; Gong, Hang.

A direct, regiospecific, and efficient palladium-catalyzed α-ketoesterification of 8-methylquinoline derivatives to generate α-ketoester has been discovered. This reaction is conducted at a mild temperature, free of peroxide, and compatible with air, and various α-ketoester were achieved with good yields. Importantly, this reaction can be easily amplified to gram level using only 1 mol % of the palladium catalyst, indicating that there is the potential for further reduction of the amount of catalyst loading required for large-scale production

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

Heterocyclic compounds can be divided into two categories: alicyclic heterocycles and aromatic heterocycles. Compounds whose heterocycles in the molecular skeleton cannot reflect aromaticity are called alicyclic heterocyclic compounds. Compound: 14481-08-4, is researched, Molecular C22H38NiO4, about (1,10-Phenanthroline-κ2N,N’)bis(2,2,6,6-tetramethylheptane-3,5-dionato-κ2O,O’)nickel(II), the main research direction is crystal structure nickel phenanthroline tetramethylheptanedionato complex; mol structure nickel phenanthroline methylheptanedionato complex.Formula: C22H38NiO4.

Bis(2,2,6,6-tetramethylheptane-3,5-dionato-κ2O,O’)(1,10-phenanthroline-κ2N,N’)nickel, [Ni(C11H19O2)2(C12H8N2)], was obtained from the reaction of bis(2,2,6,6-tetramethylheptane-3,5-dionato)nickel(II), [Ni(dpm)], and 1,10-phenanthroline (phen). The NiII ion is coordinated by 4 O atoms from 2 dpm ligands and 2 N atoms from a phen ligand in a slightly distorted octahedral environment. The Me C atoms of 2 of the CMe3 groups are disordered over 2 sites, having approx. occupancies of 0.85 and 0.15 for the 2 components. In the crystal structure, there are no direction-specific interactions. Thermal studies showed that the title complex is stable to 623 K. Crystallog. data are given.

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

In general, if the atoms that make up the ring contain heteroatoms, such rings become heterocycles, and organic compounds containing heterocycles are called heterocyclic compounds. An article called Ir/Cu dual catalysis: Enantio- and diastereodivergent access to α,α-disubstituted α-amino acids bearing vicinal stereocenters, published in 2018-02-14, which mentions a compound: 415918-91-1, Name is (11bR)-N,N-Bis[(1R)-1-phenylethyl]dinaphtho[2,1-d:1′,2′-f][1,3,2]dioxaphosphepin-4-amine, Molecular C36H30NO2P, COA of Formula: C36H30NO2P.

We describe a fully stereodivergent synthesis of a range of α,α-disubstituted α-amino acids via an Ir/Cu-catalyzed α-allylation of readily available imine esters. The introduction of a Cu-Phox complex-activated imine ester into the chiral iridium-catalyzed allylic allylation process is crucial for its high reactivity and excellent enantio- and diastereoselectivity (up to >99% ee and >20:1 dr). Importantly, the two chiral catalysts allow for full control over the configuration of the stereocenters, affording all stereoisomers of the desired products. The utility of this methodol. was demonstrated by synthesizing dipeptides and analogs of bioactive mols. in a stereodivergent manner.

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

In general, if the atoms that make up the ring contain heteroatoms, such rings become heterocycles, and organic compounds containing heterocycles are called heterocyclic compounds. An article called Secondary Interactions or Ligand Scrambling? Subtle Steric Effects Govern the Iridium(I) Coordination Chemistry of Phosphoramidite Ligands, published in 2010, which mentions a compound: 415918-91-1, Name is (11bR)-N,N-Bis[(1R)-1-phenylethyl]dinaphtho[2,1-d:1′,2′-f][1,3,2]dioxaphosphepin-4-amine, Molecular C36H30NO2P, Name: (11bR)-N,N-Bis[(1R)-1-phenylethyl]dinaphtho[2,1-d:1′,2′-f][1,3,2]dioxaphosphepin-4-amine.

The like and unlike isomers of phosphoramidite (P*) ligands are found to react differently with iridium(I), which is a key to explaining the apparently inconsistent results obtained by us and other research groups in a variety of catalytic reactions. Thus, the unlike diastereoisomer (aR,S,S)-[IrCl(cod)(1a)] (2a; cod = 1,5-cyclooctadiene, 1a = (aR,S,S)-(1,1′-binaphthalene)-2,2′-diyl bis(1-phenylethyl)phosphoramidite) forms, upon chloride abstraction, the monosubstituted complex (aR,S,S)-[Ir(cod)(1,2-η-1a,κP)]+ (3a), which contains a chelating P* ligand that features an η2 interaction between a dangling Ph group and iridium. Under analogous conditions, the like analog (aR,R,R)-1a’ gives the disubstituted species (aR,R,R)-[Ir(cod)(1a’,κP)2]+ (4a’) with monodentate P* ligands. The structure of 3a was assessed by a combination of x-ray and NMR spectroscopic studies, which indicate that it is the configuration of the binaphthol moiety (and not that of the dangling benzyl N groups) that determines the configuration of the complex. The effect of the relative configuration of the P* ligand on its iridium(I) coordination chem. is discussed in the context of our preliminary catalytic results and of apparently random results obtained by other groups in the iridium(I)-catalyzed asym. allylic alkylation of allylic acetates and in rhodium(I)-catalyzed asym. cycloaddition reactions. Further studies with the unlike ligand (aS,R,R)-(1,1′-binaphthalene)-2,2′-diyl bis{[1-(1-naphthalene-1-yl)ethyl]phosphoramidite} (1b) showed a yet different coordination mode, i.e., the η4-arene-metal interaction in (aS,R,R)-[Ir(cod)(1,2,3,4-η-1b,κP)]+ (3b).

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

Reference of (11bR)-N,N-Bis[(1R)-1-phenylethyl]dinaphtho[2,1-d:1′,2′-f][1,3,2]dioxaphosphepin-4-amine. The fused heterocycle is formed by combining a benzene ring with a single heterocycle, or two or more single heterocycles. Compound: (11bR)-N,N-Bis[(1R)-1-phenylethyl]dinaphtho[2,1-d:1′,2′-f][1,3,2]dioxaphosphepin-4-amine, is researched, Molecular C36H30NO2P, CAS is 415918-91-1, about Stereoselective synthesis of 2,6-disubstituted piperidines using the iridium-catalyzed allylic cyclization as configurational switch: asymmetric total synthesis of (+)-241 D and related piperidine alkaloids. Author is Gnamm, Christian; Krauter, Caroline M.; Broedner, Kerstin; Helmchen, Guenter.

Pressing the configurational switch: Use of enantiomeric Ir catalysts allows the vinylpiperidine building blocks I (R = CH:CH2, R1 = H; R = H, R1 = CH:CH2) to be synthesized with high selectivity. Total syntheses of the dendrobate alkaloid (+)-241 D, its C6-epimer, and spruce alkaloid I (R = H, R1 = n-Pr) are presented as applications.

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Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Collins, Michael J.; Henneike, H. Fred published the article 《Lewis acid studies of bis(2,2,6,6-tetramethyl-3,5-heptanediono)nickel(II)》. Keywords: tetramethylheptanediononickel Lewis acid adduct; dimethylsulfoxide tetramethylheptanediononickel adduct; diethylamine tetramethylheptanediononickel adduct; triethylamine tetramethylheptanediononickel adduct; pyridineoxide tetramethylheptanediononickel adduct.They researched the compound: Bis(2,2,6,6-tetramethyl-3,5-heptanedionato)nickel(II)( cas:14481-08-4 ).Application of 14481-08-4. Aromatic heterocyclic compounds can be divided into two categories: single heterocyclic and fused heterocyclic. In addition, there is a lot of other information about this compound (cas:14481-08-4) here.

Equilibrium constants and enthalpies for the adduct formation reaction between the square-planar diamagnetic Lewis acid bis(2,2,6,6-tetramethyl-3,5-heptanedionato) nickel(II) and the Lewis bases Me2SO, pyridine-N-oxide, diethylamine, and Et3N were determined under solvent conditions in which the reported enthalpies of the mono adduct formation reactions are found to correlate well with the Drago-Wayland (1970) equation. The magnetic moment of the diethylamino mono adduct is 3.25 μB. This represents the 1st time the parameters of the equation have been determined for a Lewis acid which undergoes a change in spin state upon coordination.

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

Most of the natural products isolated at present are heterocyclic compounds, so heterocyclic compounds occupy an important position in the research of organic chemistry. A compound: 14481-08-4, is researched, SMILESS is CC(C)(C1=O[Ni+2]2(O=C(C(C)(C)C)[CH-]1)O=C([CH-]C(C(C)(C)C)=O2)C(C)(C)C)C, Molecular C22H38NiO4Preprint, ChemRxiv called Nickel supported on mesoporous zirconium oxide by atomic layer deposition: initial fixed-bed reactor study, Author is Voigt, Pauline; Haimi, Eero; Lahtinen, Jouko; Cheah, You Wayne; Makela, Eveliina; Viinikainen, Tiia; Puurunen, Riikka L., the main research direction is nickel supported mesoporous zirconium oxide atomic layer deposition catalyst.COA of Formula: C22H38NiO4.

Atomic layer deposition (ALD) is gaining attention as a catalyst preparation method able to produce metal (oxide, sulfide, etc.) nanoparticles of uniform size down to single atoms. This work reports our initial experiments to support nickel on mesoporous zirconia. Nickel (2,2,6,6-tetramethyl-3,5-heptanedionato)2 [Ni(thd)2] was reacted in a fixed-bed ALD reactor with zirconia, characterized with BET surface area of 72 m2/g and mean pore size of 14 nm. According to X-ray fluorescence measurements, the average nickel loading on the top part of the support bed was on the order of 1 wt-%, corresponding to circa one nickel atom per square nanometer. Cross-sectional SEM combined with energy-dispersive spectroscopy confirmed that in the top part of the fixed support bed, nickel was distributed throughout the zirconia particles. XPS indicated the nickel oxidation state to be two. Organic thd ligands remained complete on the surface after the Ni(thd)2 reaction with zirconia, as followed with diffuse reflectance IR Fourier transform spectroscopy. The ligands could be fully removed by oxidation at 400 °C. These initial results indicate that nickel catalysts on zirconia can likely be made by ALD. Before catalytic testing, in addition to increasing the nickel loading by repeated ALD cycles, optimization of the process parameters is required to ensure uniform distribution of nickel throughout the support bed and within the zirconia particles.

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

Recommanded Product: (11bR)-N,N-Bis[(1R)-1-phenylethyl]dinaphtho[2,1-d:1′,2′-f][1,3,2]dioxaphosphepin-4-amine. The protonation of heteroatoms in aromatic heterocycles can be divided into two categories: lone pairs of electrons are in the aromatic ring conjugated system; and lone pairs of electrons do not participate. Compound: (11bR)-N,N-Bis[(1R)-1-phenylethyl]dinaphtho[2,1-d:1′,2′-f][1,3,2]dioxaphosphepin-4-amine, is researched, Molecular C36H30NO2P, CAS is 415918-91-1, about Regio- and Enantioselective N-Allylations of Imidazole, Benzimidazole, and Purine Heterocycles Catalyzed by Single-Component Metallacyclic Iridium Complexes. Author is Stanley, Levi M.; Hartwig, John F..

Highly regio- and enantioselective iridium-catalyzed N-allylations of benzimidazoles, imidazoles, and purines were developed. N-Allylated benzimidazoles and imidazoles were isolated in high yields (up to 97%) with high branched-to-linear selectivity (up to 99:1) and enantioselectivity (up to 98% ee) from the reactions of benzimidazole and imidazole nucleophiles with unsym. allylic carbonates in the presence of single component, ethylene-bound, metallacyclic iridium catalysts. N-Allylated purines were also obtained in high yields (up to 91%) with high N9/N7 selectivity (up to 96:4), high branched-to-linear selectivity (98:2), and high enantioselectivity (up to 98% ee) under similar conditions. Competition experiments between common amine nucleophiles and the heterocyclic nitrogen nucleophiles illustrated the effect of nucleophile pKa on the rate of the iridium-catalyzed N-allylation reactions. Kinetic studies on the allylation of benzimidazole catalyzed by metallacyclic iridium-phosphoramidite complexes, in combination with studies on the deactivation of these catalysts in the presence of heterocyclic nucleophiles, provided insight into the effects of the structures of the phosphoramidite ligands on the stability of the metallacyclic catalysts.

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

Computed Properties of C6H12N2O4Pt. Aromatic heterocyclic compounds can also be classified according to the number of heteroatoms contained in the heterocycle: single heteroatom, two heteroatoms, three heteroatoms and four heteroatoms. Compound: cis-Diammine(1,1-cyclobutanedicarboxylato)platinum(II), is researched, Molecular C6H12N2O4Pt, CAS is 41575-94-4, about FRESC: French Real world Extensive stage SCLC Cohorts: A retrospective study on patient characteristics and treatment strategy based on KBP-2010.. Author is Debieuvre, Didier; Dayen, Charles; Dixmier, Adrien; Pau, David; Sibley-Revelat, Anna; Greenwood, William; Gally, Samuel; Falchero, Lionel.

OBJECTIVES: FRESC reanalyzed extensive-stage small-cell lung cancer (ES-SCLC) patient data from the French KBP-2010 cohort to describe the characteristics and therapeutic management of ES-SCLC and provide real-world estimates of survival. METHODS: A target population of first line (1L) ES-SCLC was identified at initial diagnosis in KBP-2010 (KBP population, N = 796). A KBP-2010 subpopulation was defined as patients who also met the IMpower133 clinicaltrial PS ≤ 1 inclusion criteria (KBP-PS_0/1 population, N = 394). Subgroups were defined according to the 1L ES-SCLC chemotherapy regimens: carboplatin or cisplatin with etoposide (Carb-E or Cisp-E subgroups). RESULTS: The vast majority of KBP populations exhibited stage IV ES-SCLC (84.9%) at initial diagnosis. Median age was 66 years; patients were mostly male and smokers. Patients receiving Cisp + Eto were younger (median age 61 years [55.0-67.0]) and fitter (25.5% had PS ≥ 2) than those receiving Carb + Eto (71 years [62.5-77.5]; 44.1%had PS ≥ 2). Median overall survival (OS) of chemotherapy-treated 1L ES-SCLC patients varied from 7.0 months [95% CI, 6.1; 7.8] in the KBPCarb-Esubgroups to 9.6 months [95% CI, 8.4;10.8] in the KBP Cisp-E subgroup. KBP-PS_0/1 population showed better median OS, especially for the Cisp-E subgroup (10 months [95% CI, 8.7; 11.3]). CONCLUSION: In the KBP-PS_0/1 population, median OS was close to the one that was found in the IMpower133 control arm. Although this needs to be confirmed by further research, it suggests the transposability of the IMpower133 results to real-life conditions.

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