Tag: M.W=500-600

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 Total synthesis of (+)-spiroindimicin A via asymmetric palladium-catalyzed spirocyclization, published in 2021, 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 spiroindimicins are a unique class of chlorinated indole alkaloids characterized by three heteroaromatic rings structured around a congested spirocyclic stereocenter. Here, we report the first total synthesis of (+)-spiroindimicin A (I), which bears a challenging C-3’/C-5”-linked spiroindolenine. We detail our initial efforts to effect a biomimetic oxidative spirocyclization from its proposed natural precursor, lynamicin D, and describe how these studies shaped our final abiotic 9-step solution to this complex alkaloid built around a key asym. Pd-catalyzed spirocyclization. Scalable access to spiroindimicins A, H, and their congeners has enabled discovery of their activity against several parasites relevant to human health, providing potential starting points for new therapeutics for the neglected tropical diseases leishmaniasis and African sleeping sickness.

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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 Effects of Catalyst Activation and Ligand Steric Properties on the Enantioselective Allylation of Amines and Phenoxides, published in 2005-03-17, 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, Recommanded Product: (11bR)-N,N-Bis[(1R)-1-phenylethyl]dinaphtho[2,1-d:1′,2′-f][1,3,2]dioxaphosphepin-4-amine.

The yields, enantioselectivities, and regioselectivities of the reactions of amines and phenoxides with allylic carbonates in the presence of a metallacyclic iridium catalyst were compared. These data show that both preactivation of the catalyst and the size of the ligand affect the yield, enantioselectivity, and regioselectivity. With the activated catalyst containing a bis-naphthethylamino group, the allylic amination and etherification of a broad range of allylic carbonates occurred in high yields and with high regioselectivities and enantioselectivities.

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

Safety 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 Formation of quaternary centres by copper catalysed asymmetric conjugate addition to β-substituted cyclopentenones with the aid of a quantitative structure-selectivity relationship. Author is Ardkhean, Ruchuta; Mortimore, Mike; Paton, Robert S.; Fletcher, Stephen P..

A new asym. conjugate addition method was developed for β-substituted cyclopentenones to form quaternary centers using alkylzirconocene nucleophiles giving up to 97% yield and 92% ee. Key to the reaction’s success was the design of suitable phosphoramidite ligands which was aided by a linear quant. structure-selectivity relationship (QSSR). QSSR models were created from the ligand screening data (a total of 36 ligands) which revealed important electronic and steric requirements and led to the synthesis of more enantioselective ligands. DFT calculations of competing transition structures enable the interpretation of the electronic and steric terms present in the QSSR models.

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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)-2,6-Bis(3,5-dimethylphenyl)-4-hydroxydinaphtho[2,1-d:1′,2′-f][1,3,2]dioxaphosphepine 4-oxide, is researched, Molecular C36H29O4P, CAS is 861909-53-7, about Direct Interconversion of BINOL and H8-BINOL-Based Chiral Bronsted Acids Using Single-Step Red/Ox Manipulations, the main research direction is chiral binol phosphoric acid hydrogen hydrogenation; octahydrogenated binol phosphoric acid preparation; DDQ octahydrogenated binol chiral phosphoric acid oxidation; binol phosphoric acid preparation.SDS of cas: 861909-53-7.

A direct single-step hydrogenation of BINOL-based chiral phosphoric acids, N-triflyl phosphoramides, and disulfonimides to the corresponding H8-BINOL Bronsted acids in excellent yields and chemoselectivities is described. In addition, the conditions for the single-step oxidation of H8-BINOL-based Bronsted acids into the corresponding BINOL-based acids have been identified and employed to accomplish these interconversions in 41-81% yield.

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

Safety of (11bR)-N,N-Bis[(1R)-1-phenylethyl]dinaphtho[2,1-d:1′,2′-f][1,3,2]dioxaphosphepin-4-amine. Aromatic compounds can be divided into two categories: single heterocycles and fused 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 Palladium-Catalyzed Enantioselective Heteroarenyne Cycloisomerization Reaction. Author is Liang, Ren-Xiao; Song, Ling-Jie; Lu, Jin-Bo; Xu, Wei-Yan; Ding, Chao; Jia, Yi-Xia.

The extensively developed ene-type enantioselective cycloisomerization of classical 1,n-enynes provides an efficient approach to chiral cyclic 1,4-dienes. In contrast, the catalytic asym. heteroarenyne (heteroarene-alkyne) cycloisomerization involving the dearomative transformation of endocyclic aromatic C=C bonds remains unknown. Herein, we communicate a PdH-catalyzed enantioselective heteroarenyne cycloisomerization reaction of alkyne-tethered indole substrates (formal 1,5- and 1,6-enynes). Based on this strategy, a variety of structurally diverse chiral spiro and fused indoline derivatives bearing quaternary stereocenters and exocyclic C=C bonds are afforded in moderate to excellent yields and excellent enantioselectivities (up to 98% ee). The classical ene-type enantioselective 1,5-enyne cycloisomerization of N-vinylpropiolamides is also developed to afford chiral 2-pyrrolones in good to excellent ee values.

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

Synthetic Route of 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 Synthesis of β3-Amino Esters by Iridium-Catalyzed Asymmetric Allylic Alkylation Reaction. Author is Cao, Chao-Guo; He, Bin; Fu, Zhengyan; Niu, Dawen.

A method to prepare chiral β3-amino esters from Me 3-aminopropanoate was described. This method capitalized on a sequence involving an Ir-catalyzed asym. allylation of 2-azaallyl anions and a 2-aza-Cope rearrangement. β3-Amino esters containing a versatile alkene group were prepared

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

The three-dimensional configuration of the ester heterocycle is basically the same as that of the carbocycle. Compound: (11bR)-N,N-Bis[(1R)-1-phenylethyl]dinaphtho[2,1-d:1′,2′-f][1,3,2]dioxaphosphepin-4-amine(SMILESS: 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,cas:415918-91-1) is researched.SDS of cas: 329-89-5. The article 《Ir/Zn Dual Catalysis: Enantioselective and Diastereodivergent α-Allylation of Unprotected α-Hydroxy Indanones》 in relation to this compound, is published in Organic Letters. Let’s take a look at the latest research on this compound (cas:415918-91-1).

A one-step enantioselective and diastereodivergent α-allylation of unprotected α-hydroxy indanones was developed using an Ir/Zn dual catalyst system; no addnl. base is required. The cyclic tertiary α-hydroxyketones containing vicinal stereocenters can be synthesized with excellent enantioselectivity (up to >99% ee) and good diastereoselectivity (up to 12:1 dr). By a simple choice of the appropriate chiral metal catalyst combination, all four product stereoisomers could be obtained from the same starting materials and under identical conditions.

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

Quality Control of (11bR)-N,N-Bis[(1R)-1-phenylethyl]dinaphtho[2,1-d:1′,2′-f][1,3,2]dioxaphosphepin-4-amine. Aromatic compounds can be divided into two categories: single heterocycles and fused 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 Asymmetric synthesis of quaternary α-trifluoromethyl α-amino acids by Ir-catalyzed allylation followed by kinetic resolution. Author is Sun, Xi-Shang; Qiu, Ou-Yang; Xu, Shi-Ming; Wang, Xing-Heng; Tao, Hai-Yan; Chung, Lung Wa; Wang, Chun-Jiang.

Facile access to quaternary α-trifluoromethyl α-amino acids has been developed. This sequential reaction involves an Ir-catalyzed asym. allylation of α-trifluoromethyl aldimine esters followed by an unprecedented kinetic resolution

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

So far, in addition to halogen atoms, other non-metallic atoms can become part of the aromatic heterocycle, and the target ring system is still aromatic.Lee, Yeosan; Park, Jinyoung; Cho, Seung Hwan researched the compound: (11bR)-N,N-Bis[(1R)-1-phenylethyl]dinaphtho[2,1-d:1′,2′-f][1,3,2]dioxaphosphepin-4-amine( cas:415918-91-1 ).Quality Control of (11bR)-N,N-Bis[(1R)-1-phenylethyl]dinaphtho[2,1-d:1′,2′-f][1,3,2]dioxaphosphepin-4-amine.They published the article 《Generation and Application of (Diborylmethyl)zinc(II) Species: Access to Enantioenriched gem-Diborylalkanes by an Asymmetric Allylic Substitution》 about this compound( cas:415918-91-1 ) in Angewandte Chemie, International Edition. Keywords: diborylmethyl lithium preparation transmetalation; zinc diborylmethyl preparation reaction BOC protected allyl alc; enantioenriched gem diborylalkane preparation asym allylic substitution; allylic alkylation; enantioselectivity; homogeneous catalysis; organoboron compounds; zinc. We’ll tell you more about this compound (cas:415918-91-1).

Authors report the successful generation of (diborylmethyl)zinc(II) species by transmetalation between isolable (diborylmethyl)lithium and zinc(II) halide (X = Br, Cl) and their application in the synthesis of enantioenriched gem-diborylalkanes bearing a stereogenic center at the β-position of the diboryl groups by an asym. allylic substitution reaction. The reaction has a broad substrate scope, and various enantioenriched gem-diborylalkanes can be obtained in good yields with excellent enantioselectivity. Further elaboration of the enantioenriched gem-diborylalkanes provides access to a diverse set of valuable chiral building blocks.

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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: 415918-91-1, is researched, Molecular C36H30NO2P, about 1H DOSY Spectra of Ligands for Highly Enantioselective Reactions-A Fast and Simple NMR Method to Optimize Catalytic Reaction Conditions, the main research direction is aggregation selected phosphoramidite ligand transition metal complex.Product Details of 415918-91-1.

Herein, we present the first aggregation study of selected phosphoramidite ligands and their transition-metal complexes. The aggregation trends of the ligands, the complexes of which can catalyze highly enantioselective reactions, reveal that an easy and fast DOSY screening of the free ligands allows a prediction of the aggregation trends of their transition-metal complexes, even without knowledge about their structures.

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