Author: tianli

Most of the compounds have physiologically active properties, and their biological properties are often attributed to the heteroatoms contained in their molecules, and most of these heteroatoms also appear in cyclic structures. A Journal, Article, Research Support, Non-U.S. Gov’t, ChemSusChem called Chemoselective CaO-Mediated Acylation of Alcohols and Amines in 2-Methyltetrahydrofuran, Author is Pace, Vittorio; Hoyos, Pilar; Alcantara, Andres R.; Holzer, Wolfgang, which mentions a compound: 58081-05-3, SMILESS is O=C1OC[C@H](O)C1, Molecular C4H6O3, Recommanded Product: (R)-4-Hydroxydihydrofuran-2(3H)-one.

Calcium oxide is proposed as an innocuous acid scavenger for the chemoselective synthesis of amide- and ester-type compounds Although these mols. have wide spread applications in organic and pharmaceutical chem., and a large number of routes have been designed for their synthesis, the development of more efficient and environmentally friendly acylation strategies remains an ongoing challenge. The use of CaO allows for the stoichiometric acylation of primary alcs. in the presence of phenols or tertiary alcs.; amines can also be subjected to acylation reactions in the presence of hydroxyl groups. Chirality is obtained through acylation if the starting material is an optically pure alc. or if a chiral acylating agent is used. Furthermore, the use of 2-methyltetrahydrofuran (2-MeTHF), a more ecofriendly solvent, leads to maximized yields. This protocol is successfully applied to the synthesis of an interesting N-aryloxazolidin-2-one intermediate for the preparation of linezolid-type compounds

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Reference:
Pyrroline – Wikipedia,
1-Pyrroline | C4H7N – PubChem

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 Aliphatic and aromatic glucosides from Anoectochilus koshunensis, published in 1993-07-31, which mentions a compound: 58081-05-3, Name is (R)-4-Hydroxydihydrofuran-2(3H)-one, Molecular C4H6O3, HPLC of Formula: 58081-05-3.

A new simple aliphatic glucoside, 3-(R)-3-β-D-glucopyranosyloxybutanolide (kinsenoside) with its congeners and a heterocyclic aromatic glucoside, β-glucopyranosyl-3-pyridinemethanol (nicoloside) were isolated from whole plants of A. koshunensis. Their structures were elucidated from chem. and spectroscopic evidence.

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Reference:
Pyrroline – Wikipedia,
1-Pyrroline | C4H7N – PubChem

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: 34941-92-9, is researched, Molecular C5H3ClFN, about Access to Highly Substituted 7-Azaindoles from 2-Fluoropyridines via 7-Azaindoline Intermediates, the main research direction is azaindole preparation; azaindoline preparation regioselective electrophilic substitution bromination nitration oxidation; fluoronitroethylpyridine preparation oxidative Nef reaction reductive amination intramol SNAr; nitroolefin fluoropyridine metalation addition.COA of Formula: C5H3ClFN.

A versatile synthesis of 7-azaindoles e. g., I, from substituted 2-fluoropyridines is described. C3-metalation and 1,4-addition to nitroolefins provide substituted 2-fluoro-3-(2-nitroethyl)pyridines. A facile oxidative Nef reaction/reductive amination/intramol. SNAr sequence furnishes 7-azaindolines. Finally, optional regioselective electrophilic C5-substitution (e.g., bromination or nitration) and subsequent in situ oxidation delivers highly functionalized 7-azaindoles in high overall efficiency.

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Reference:
Pyrroline – Wikipedia,
1-Pyrroline | C4H7N – PubChem

Recommanded Product: 4045-24-3. Aromatic compounds can be divided into two categories: single heterocycles and fused heterocycles. Compound: 4-Methoxypiperidine, is researched, Molecular C6H13NO, CAS is 4045-24-3, about Development of peptide epoxyketones as selective immunoproteasome inhibitors. Author is Li, Xuemei; Hong, Duidui; Zhang, Mengmeng; Xu, Lei; Zhou, Yubo; Li, Jia; Liu, Tao.

A series of epoxyketone analogs with varying N-caps and P3-configurations were designed, synthesized and evaluated. We found that D-Ala in P3 was crucial for β5i selectivity over β5c. Notably, compounds (I) (R1 = II) (β5i IC50 = 26.0 nM, 25-fold selectivity) and I (r1 = III) (β5i IC50 = 25.1 nM, 24-fold selectivity) with the D-configuration at P3 were the most selective inhibitors. Although I (R1 = II and III) showed only moderate anti-proliferative activity against RPMI-8226 and MM.1S cell lines, based on our experiments, it indicates that the inhibition of β5i alone is not sufficient to exert anticancer effects and may rely on the complementary inhibition of β1i, β5c and β5i. These data further increase our understanding of immunoproteasome inhibitors in hematol. malignancies.

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Reference:
Pyrroline – Wikipedia,
1-Pyrroline | C4H7N – PubChem

Straubinger, Markus; Bau, Brigitte; Eckstein, Susanne; Fink, Margit; Winterhalter, Peter published an article about the compound: (R)-4-Hydroxydihydrofuran-2(3H)-one( cas:58081-05-3,SMILESS:O=C1OC[C@H](O)C1 ).Computed Properties of C4H6O3. Aromatic heterocyclic compounds can be classified according to the number of heteroatoms or the size of the ring. The authors also want to convey more information about this compound (cas:58081-05-3) through the article.

The methanolic extract of saffron was separated with the aid of multilayer coil countercurrent chromatog. After purification by HPLC, the following seven novel carotenoid metabolites were identified on the basis of their spectral (UV, FTIR, MS, NMR, CD) data: (4R)-4-hydroxy-2,6,6-trimethylcyclohex-1-enecarbaldehyde O-β-D-gentiobioside (1), (4R)-4-hydroxy-2,6,6-trimethylcyclohex-1-enecarboxylic acid O-β-D-glucopyranoside (2), 6-hydroxy-3-(hydroxymethyl)-2,4,4-trimethylcyclohexa-2,5-dienone 6-O-β-D-glucopyranoside (3), (2Z)-3-methylpent-2-enedioic acid 1-[1-(2,4,4-trimethyl-3,6-dioxocyclohexenyloxy)-O-β-D-glucopyranosid-6-yl] ester (4), (5S)-5-hydroxy-7,7-dimethyl-4,5,6,7-tetrahydro-3H-isobenzofuran-1-one O-β-D-glucopyranoside (5), (1R,5S,6R)-5-(hydroxymethyl)-4,4,6-trimethyl-7-oxabicyclo[4.1.0]heptan-2-one O-β-D-glucopyranoside (6), and (1R)- 3,5,5-trimethylcyclohex-3-enol O-β-D-glucopyranoside (7).

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Reference:
Pyrroline – Wikipedia,
1-Pyrroline | C4H7N – PubChem

In organic chemistry, atoms other than carbon and hydrogen are generally referred to as heteroatoms. The most common heteroatoms are nitrogen, oxygen and sulfur. Now I present to you an article called Total Synthesis of (+)-Mycotrienol and (+)-Mycotrienin I: Application of Asymmetric Crotylsilane Bond Constructions, published in 1998-05-06, which mentions a compound: 58081-05-3, mainly applied to mycotrienol mycotrienin I synthesis, Recommanded Product: 58081-05-3.

A highly convergent asym. synthesis of the ansamycin antibiotics (+)-mycotrienin I (I) [R = 2-(S)-cyclohexylcarbonylaminopropionyl] and (+)-mycotrienol I (R = H) has been achieved through the synthesis and coupling of the C9-C16 subunit II and the aromatic subunit III, resp. This article describes the complete details of that work as it illustrates the utility of our developing chiral (E)-crotylsilane bond construction methodol. in total synthesis. All four stereogenic centers were introduced using chiral allylsilane bond construction methodol. In the synthesis of subunit II, the C12 and C13 stereocenters were installed using an asym. crotylsilylation reaction to α-keto dibenzyl acetal MeCOCH(OCH2Ph)2. The C11 stereocenter was subsequently installed via a chelate-controlled addition of allyltrimethylsilane to establish the anti-1,3-diol system. The C14-C15 trisubstituted double bond was then installed via a reductive opening of α,β-unsaturated lactone (IV). Aromatic subunit III was chosen on the basis of its synthon equivalency to the amidobenzoquinone system of I. Subunit III was constructed in a concise six-step sequence which incorporates the C3 stereogenic center of the C1-C5 side chain. The C3 stereogenic center was established using a Weinreb amidation of 2,5-dimethoxy-3-phenylsulfonylmethylaniline with (+)-3R-methoxybutanolide, whose absolute stereochem. was derived using the crotylsilane methodol. The union of subunit II with aromatic subunit III was accomplished using a sulfone-based coupling strategy. Coupling product (V) was transformed through a sequence of steps to triene. Divergence from this advanced intermediate allows access to both natural products. The successful completion of the synthesis included the incorporation of the (E,E,E)-triene unit with simultaneous macrocyclization through a palladium (0)-catalyzed (Stille-type) coupling macrocyclization.

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Reference:
Pyrroline – Wikipedia,
1-Pyrroline | C4H7N – PubChem

In organic chemistry, atoms other than carbon and hydrogen are generally referred to as heteroatoms. The most common heteroatoms are nitrogen, oxygen and sulfur. Now I present to you an article called Structure determination and synthesis of a new cerebroside isolated from the traditional Chinese medicine Typhonium giganteum Engl., published in 2002-05-06, which mentions a compound: 58081-05-3, mainly applied to cerebroside Typhonium structure; medicinal plant typhoniside structure, Category: pyrrolines.

A new cerebroside, typhoniside A (I), with C18-4,8-sphingadienine as the long-chain base, has been isolated from the traditional Chinese medicine Typhonium giganteum Engl., and its structure was determined by 2D-NMR and MS methods. It was then synthesized using D-xylose and ascorbic acid as the chiral starting materials.

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Reference:
Pyrroline – Wikipedia,
1-Pyrroline | C4H7N – PubChem

Recommanded Product: (R)-4-Hydroxydihydrofuran-2(3H)-one. The fused heterocycle is formed by combining a benzene ring with a single heterocycle, or two or more single heterocycles. Compound: (R)-4-Hydroxydihydrofuran-2(3H)-one, is researched, Molecular C4H6O3, CAS is 58081-05-3, about Synthesis of 11-C-20-C segment of leukotriene B4 and migration of silyl protecting group. Author is Wang, Yanfang; Li, Jincui; Wu, Yulin.

A new synthesis of 11-C-20-C segment of leukotriene B4, 2(R)-hydroxydec-4(Z)-enal derivatives I (R = SiPh2CMe3, SiMe2CMe3, CPh3) using ascorbic acid as chiron is described. A partial or full migration of silyl protecting group from a secondary hydroxy group to a vicinal primary one is discovered in the Wittig reaction of hemiacetals II (R1 = SiPh2CMe3, SiMe2CMe3) with Me(CH2)5P+Ph3Br-.

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Reference:
Pyrroline – Wikipedia,
1-Pyrroline | C4H7N – PubChem

The three-dimensional configuration of the ester heterocycle is basically the same as that of the carbocycle. Compound: (R)-4-Hydroxydihydrofuran-2(3H)-one(SMILESS: O=C1OC[C@H](O)C1,cas:58081-05-3) is researched.Recommanded Product: 58081-05-3. The article 《A Concise Stereoselective Total Synthesis of Methoxyl Citreochlorols and Their Structural Revisions》 in relation to this compound, is published in European Journal of Organic Chemistry. Let’s take a look at the latest research on this compound (cas:58081-05-3).

A concise, stereoselective and protecting group free approaches for the total synthesis of (-)-(2S,4R)- and (+)-(2R,4S)-3′-methoxyl citreochlorols, e.g., I, and their stereoisomers are demonstrated. All four stereoisomers were synthesized to establish the absolute stereochem. of the reported structures and the structures were revised accordingly. The approach involves chelation controlled regioselective reduction of a diester, silyl iodide promoted ring-opening iodo esterification of lactones, highly chemo- and regioselective ring-opening of an epoxy ester, dichloromethylation of a carboxyl group, and syn- and anti-selective reduction of the resulted β-hydroxy ketone as key steps.

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Reference:
Pyrroline – Wikipedia,
1-Pyrroline | C4H7N – PubChem

Recommanded Product: 58081-05-3. The mechanism of aromatic electrophilic substitution of aromatic heterocycles is consistent with that of benzene. Compound: (R)-4-Hydroxydihydrofuran-2(3H)-one, is researched, Molecular C4H6O3, CAS is 58081-05-3, about Chiroptical properties of lactones. II. Electronic rotatory strengths of the n .far. π* transition in saturated γ- and δ-lactones. Author is Richardson, Frederick S.; Pitts, William.

The chiroptical properties associated with the n→π* transition of dissymmetric saturated γ- and δ-lactones were calculated and relations between the chiroptical observables and the stereochem. and electronic structural features were examined The calculations were based on the INDO MO method for the electronic structure of the mol. systems and excited states were constructed in the virtual orbital-CI approximation The highest and second highest occupied orbitals calculated for each of the 17 structures studied are, resp., the inplane n and the out-of-plane π° nonbonding orbitals localized on the O:CO group. The lowest lying singlet state is nπ* and the calculated transition wavelengths for transitions in this state are 197-230 nm. The calculated n→π* rotatory strengths and dissymmetry factors agree with experiment

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Reference:
Pyrroline – Wikipedia,
1-Pyrroline | C4H7N – PubChem