Tag: M.W=500-600

Application In Synthesis of (11bR)-N,N-Bis[(1R)-1-phenylethyl]dinaphtho[2,1-d:1′,2′-f][1,3,2]dioxaphosphepin-4-amine. The mechanism of aromatic electrophilic substitution of aromatic heterocycles is consistent with that of benzene. 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 Highly Regio-, Diastereo- and Enantioselective Synthesis of Tetrahydroazepines and Benzo[b]oxepines through Palladium-Catalyzed [4+3] Cycloaddition Reactions. Author is Trost, Barry M.; Zuo, Zhijun.

A novel Pd0-catalyzed asym. [4+3] annulation reaction of two readily accessible starting materials was developed for building seven-membered heterocyclic architectures. The potential [3+2] side pathway could be suppressed though fine tuning of the conditions. A broad scope of cycloaddition donors and acceptors participated in the transformation with excellent chemo-, regio-, diastereo- and enantioselectivtities, leading to valuable tetrahydroazepines, e.g., I and benzo[b]oxepines, e.g., II.

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Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

COA of Formula: C36H30NO2P. The mechanism of aromatic electrophilic substitution of aromatic heterocycles is consistent with that of benzene. 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 Enantioselective iridium-catalyzed allylic aminations of allylic carbonates with functionalized side chains. Asymmetric total synthesis of (S)-vigabatrin. Author is Gnamm, Christian; Franck, Geraldine; Miller, Nicole; Stork, Timon; Broedner, Kerstin; Helmchen, Guenter.

Iridium-catalyzed aminations of allylic carbonates containing a variety of O-functional groups have been explored. High degrees of regio- as well as enantioselectivity were achieved with diacylamides under salt-free conditions and with arylamines. The results allowed the antiepilepsy drug (S)-vigabatrin to be prepared via a very short route.

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Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Electric Literature of C36H30NO2P. 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 Stereodivergent synthesis of α,α-disubstituted α-amino acids via synergistic Cu/Ir catalysis. Author is Wei, Liang; Zhu, Qiao; Xu, Shi-Ming; Chang, Xin; Wang, Chun-Jiang.

Cu/Ir dual catalysis has been developed for the stereodivergent α-allylation of aldimine esters. The method enables the preparation of a series of nonproteinogenic α-amino acids (α-AAs) bearing two contiguous stereogenic centers in high yield with excellent stereoselectivity. All four product stereoisomers could be obtained from the same set of starting materials via pairwise combination of two chiral catalysts. Notably, one-pot protocol could be successfully applied for the preparation of the bimetallic Cu/Ir complexes to simplify the manipulation of Cu/Ir dual catalysis. This method could be further utilized for the construction of the key intermediate of a bioactive pyrrolidine derivative and the concise synthesis of a plant growth regulator (2S,3S)-2-amino-3-cyclopropylbutanoic acid.

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Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

The chemical properties of alicyclic heterocycles are similar to those of the corresponding chain compounds. 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 Regioselective and enantioselective iridium-catalyzed allylation of enamines, the main research direction is alkenyl carbonate enamine allylation iridium; allylated ketone regioselective asym preparation; iridium regioselective asym allylation catalyst.Electric Literature of C36H30NO2P.

A highly enantioselective and regioselective monoallylation of the enamines of Me ketones has been developed. After hydrolysis of the enamine (NaOAc/AcOH(aq)), the desired allylated ketones were obtained in high yields with high branched-to-linear selectivity and high enantioselectivities. The reactions occurred within hours at room temperature and encompass the reactions of aromatic and aliphatic Me ketone derivatives The enamines of Me alkyl ketones, which exist as a mixture of two regioisomers, reacted selectively at the less hindered position. The use of a preformed cyclometalated iridium catalyst, iso-Pr carbonates, toluene solvent, and ZnCl2 as an alc. adsorbent was important for the development of this process.

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Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Computed Properties of C36H30NO2P. 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 Enantioselective Syntheses of Strychnos and Chelidonium Alkaloids through Regio- and Stereocontrolled Cooperative Catalysis. Author is Hutchings-Goetz, Luke S.; Yang, Chao; Fyfe, James W. B.; Snaddon, Thomas N..

We describe enantioselective syntheses of strychnos and chelidonium alkaloids. In the first case, indole acetic acid esters were established as excellent partner nucleophiles for enantioselective cooperative isothiourea/Pd catalyzed α-alkylation. This provides products containing indole-bearing stereocenters in high yield and with excellent levels of enantioinduction in a manner that is notably independent of the N-substituent. This led to concise syntheses of (-)-akuammicine and (-)-strychnine (I and II, resp.). In the second case, the poor performance of ortho-substituted cinnamyl electrophiles in the enantioselective cooperative isothiourea/Ir catalyzed α-alkylation was overcome by appropriate substituent choice, leading to enantioselective syntheses of (+)-chelidonine, (+)-norchelidonine, and (+)-chelamine (III – V, resp.).

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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: 861909-53-7, is researched, Molecular C36H29O4P, about Asymmetric Synthesis of Hydroxy Esters with Multiple Stereocenters via a Chiral Phosphoric Acid Catalyzed Kinetic Resolution, the main research direction is asym synthesis hydroxy ester multiple stereocenters kinetic resolution.Related Products of 861909-53-7.

The kinetic resolution of hydroxy tert-Bu esters through a Bronsted acid catalyzed lactonization is described. The resulting enantioenriched mols. have cyclic backbones and/or multiple stereocenters. DFT calculations explore how small changes in substrate structure can have a large impact on the selectivity of the process.

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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: 415918-91-1, is researched, SMILESS is C[C@@H](N(P1OC2=CC=C3C=CC=CC3=C2C4=C5C=CC=CC5=CC=C4O1)[C@@H](C6=CC=CC=C6)C)C7=CC=CC=C7, Molecular C36H30NO2PJournal, Article, Angewandte Chemie, International Edition called The Supramolecular Balance for Transition-Metal Complexes: Assessment of Noncovalent Interactions in Phosphoramidite Palladium Complexes, Author is Hartmann, Evelyn; Gschwind, Ruth M., the main research direction is noncovalent interaction palladium phosphoramidite NMR.SDS of cas: 415918-91-1.

The authors have presented a method to determine exptl. and quant. the contribution of noncovalent interactions within transition-metal complexes. In this general approach the ΔΔG value of two complex equilibrium is used as a measure for the deviating noncovalent interactions within the two hetero-complexes. The two equilibrium are energetically linked by the combination of one enantiopure ligand with two enantiomeric ligands, leading to identical or enantiomeric homo-complexes. This allows for the separation of supramol. interactions from stereoelectronic and electrostatic properties provided that the general complex structure is retained. Since this method uses deviating intra-complex interactions within two hetero-complexes, solvation effects of the interacting functional groups are of minor importance. The applicability of this approach was proven with phosphoramidite palladium complexes. The mutual exchange of the CH3 and the Ph groups from one ligand to its enantiomer is directly reflected in the NMR data. The exptl. determined ΔΔG value is of the right order of magnitude for the observed changes in the interaction pattern. This example proves for the first time that the catalytically highly important class of phosphoramidite ligands show a pseudo-bidentate character in solution and that modulations in the extended planar CH-π and π-π interaction interfaces cause significant energetic differences.

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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 Enantioselective α-Functionalization of 1,3-Dithianes by Iridium-Catalyzed Allylic Substitution. Author is Wang, Panpan; Jiang, Qian; Zhao, Ruibo; Xie, Xingang; Tang, Shouchu; Wang, Xiaolei.

An iridium-catalyzed asym. allylic substitution reaction with 2-(alkoxycarbonyl)-1,3-dithianes has been achieved with high regio- and enantioselectivities. The transformation provides a new method for the enantioselective α-functionalization of dithianes. The corresponding dithiane-containing products are easily converted into many other derivatives with high yields and enantioselectivities.

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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 Palladium-Catalyzed Enantioselective Cycloadditions of Aliphatic 1,4-Dipoles: Access to Chiral Cyclohexanes and Spiro [2.4] heptanes. Author is Trost, Barry M.; Jiao, Zhiwei; Liu, Ying; Min, Chang; Hung, Chao-I. Joey.

Design and exploration of new intermediates for chemo-, regio-, and stereoselective cycloadditions remain a formidable challenge in modern organic synthesis. Compared to the well-developed 1,3-dipolar cycloadditions, Pd-catalyzed 1,4-dipolar cycloadditions are generally limited to specialized substrates due to the inherent nature of the thermodynamically driven intramol. transformations and undesired isomerizations. Herein, we demonstrate the use of ligated palladium catalysts to control and modulate the intermol. reactivity of aliphatic 1,4-dipoles, enabling two distinctive cycloaddition pathways with a broad scope of acceptors. This atom-economic process also features an eco-friendly in situ deprotonation strategy to generate the corresponding active palladium-mediated dipoles. Overall, a diverse array of chiral 6-membered rings and spiro [2.4] heptanes were prepared in high yield and selectivity. In addition, an unexpected property of cyano-stabilized carbanions was discovered and investigated, which can be useful in designing and predicting future transformations.

In some applications, this compound(415918-91-1)Recommanded Product: (11bR)-N,N-Bis[(1R)-1-phenylethyl]dinaphtho[2,1-d:1′,2′-f][1,3,2]dioxaphosphepin-4-amine is unique.If you want to know more details about this compound, you can contact with the author or consult more relevant literature.

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: 861909-53-7, is researched, SMILESS is OP1(OC2=C(C3=CC(C)=CC(C)=C3)C=C4C=CC=CC4=C2C5=C6C=CC=CC6=CC(C7=CC(C)=CC(C)=C7)=C5O1)=O, Molecular C36H29O4PJournal, Article, Research Support, Non-U.S. Gov’t, Angewandte Chemie, International Edition called Gold-catalyzed [3+2]-annulations of α-aryl diazoketones with the tetrasubstituted alkenes of cyclopentadienes: High stereoselectivity and enantioselectivity, Author is Chen, Ching-Nung; Cheng, Wei-Min; Wang, Jian-Kai; Chao, Tzu-Hsuan; Cheng, Mu-Jeng; Liu, Rai-Shung, the main research direction is dihydrofuran bicyclic regioselective enantioselective diastereoselective synthesis solvent effect; aryl diazoketone stereoselective enantioselective annulation alkene cyclopentadiene gold catalyst; cyclization reaction mechanism chirality transition state DFT crystal structure; Cloke-Wilson rearrangement; [3+2]-annulations; gold catalysis; tetrasubstituted alkenes; α-diazo ketones.Computed Properties of C36H29O4P.

This work reports gold-catalyzed [3+2]-annulations of α-diazo ketones with highly substituted cyclopentadienes, affording bicyclic 2,3-dihydrofurans with high regio- and stereoselectivity. The reactions highlights the first success of tetrasubstituted alkenes to undergo [3+2]-annulations with α-diazo carbonyls. The enantioselective annulations are also achieved with high enantioselectivity using chiral forms of gold and phosphoric acid. Our mechanistic anal. supports that cyclopentadienes serve as nucleophiles to attack gold carbenes at the more substituted alkenes, yielding gold enolates that complex with chiral phosphoric acid to enhance the enantioselectivity.

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