Tag: M.W:100-200

Javorskis, Tomas; Karpaviciene, Ieva; Jurys, Arminas; Snarskis, Gustautas; Buksnaitiene, Rita; Orentas, Edvinas published an article about the compound: 1-Bromo-2-pentyne( cas:16400-32-1,SMILESS:CCC#CCBr ).Recommanded Product: 1-Bromo-2-pentyne. 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:16400-32-1) through the article.

Catalyst-free addition of ketone enolate to non-activated multiple C-C bonds involves non-complementary reaction partners and typically requires super-basic conditions. On the other hand, highly aggregated or solvated enolates are not reactive enough to undergo direct addition to alkenes or alkynes. Herein, we report a new anionic cascade reaction for one-step assembly of intriguing mol. scaffolds possessing contiguous six-, five-, and four-membered rings, representing a formal [2+2] enol-allene cycloaddition Reaction proceeds under very mild conditions and with excellent diastereoselectivity. Deeper mechanistic and computational studies revealed unusually slow proton transfer phenomenon in cyclic ketone intermediate and explained peculiar stereochem. outcome.

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

Category: tetrahydropyran. Aromatic compounds can be divided into two categories: single heterocycles and fused heterocycles. Compound: 2-Bromo-5-methylpyrazine, is researched, Molecular C5H5BrN2, CAS is 98006-90-7, about Palladium Catalyzed C-O Coupling of Amino Alcohols for the Synthesis of Aryl Ethers. Author is Mikus, Malte S.; Sanchez, Carina; Fridrich, Cary; Larrow, Jay F..

Amine containing aryl ethers are common pharmacophore motifs that continue to emerge from drug discovery efforts. As amino alcs. are readily available building blocks, practical methodologies for incorporating them into more complex structures are highly desirable. We report our efforts to explore the application of Pd-catalyzed C-O coupling methods to the arylation of 1,2- and 1,3-amino alcs. [e.g., 1-bromo-4-(trifluoromethyl)benzene + amino alc. I → II (82%, 68% isolated)]. We established general and reliable conditions, under which we explored the scope and limitations of the transformation. The insights gained have been valuable in employing this methodol. within a fast-moving drug discovery environment, which we anticipate will be of general interest to the synthesis and catalysis communities.

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Tetrahydropyran – Wikipedia,
Tetrahydropyran – an overview | ScienceDirect Topics

The preparation of ester heterocycles mostly uses heteroatoms as nucleophilic sites, which are achieved by intramolecular substitution or addition reactions. Compound: (S)-(2,2-dimethyl-[1,3]-dioxolan-4-yl)-methylamine( cas:82954-65-2 ) is researched.Application of 82954-65-2.Angrick, Michael; Rewicki, Dieter published the article 《Reactions of sugars and related polyfunctional compounds with amino acids. 2. N-Acylation of 3-amino-1,2-propanediol with amino acids》 about this compound( cas:82954-65-2 ) in Liebigs Annalen der Chemie. Keywords: acylation aminopropanediol amino acid; propanediol amino acylation. Let’s learn more about this compound (cas:82954-65-2).

Racemic H2NCH2CH(OH)CH2OH was N-acylated with Z-X-OH (Z = PhCH2O2C; X = Ala, Phe, Val, Leu) by 1,1′-carbonyldiimidazole in THF to give Z-X-NHCH2CH(OH)CH2OH (II). In some cases (e.g., X = Ala), one of the 2 diastereoisomers of II spontaneously formed a precipitate, which can be separated The S,S-configuration of II (X = Ala) was established by N-acylating (S)-(aminomethyl)dioxolane (S)-III (R = H) with Z-Ala-OH and cleaving the resulting (S)-III (R = Z-Ala) to give (S,S)-II (X = Ala).

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

Kers, Inger; Macsari, Istvan; Csjernyik, Gabor; Nyloef, Martin; Skogholm, Karin; Sandberg, Lars; Minidis, Alexander; Bueters, Tjerk; Malmborg, Jonas; Eriksson, Anders B.; Lund, Per-Eric; Venyike, Elisabet; Luo, Lei; Nystroem, Jan-Erik; Besidski, Yevgeni published an article about the compound: 2-Bromo-5-methylpyrazine( cas:98006-90-7,SMILESS:CC1=CN=C(Br)C=N1 ).SDS of cas: 98006-90-7. 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:98006-90-7) through the article.

The NaV1.7 ion channel is an attractive target for development of potential analgesic drugs based on strong genetic links between mutations in the gene coding for the channel protein and inheritable pain conditions. The (S)-N-chroman-3-ylcarboxamide series was used as a starting point for development of new channel blockers resulting in the phenethyl nicotinamide series I (X = CH, CF, N; R1 = 3-pyridyl, 2-methoxy-5-pyrimidinyl, 5-methoxy-2-pyrazinyl, etc.; R2 = H, Cl, F, Me, etc.; R3 = R4 = H, F; R3 = Me, R4 = H; R5 = F3CCH2CH2O, F3CCH2OCH2, etc.). The structure and activity relationship for this series was established and the metabolic issues of early analogs were addressed by appropriate substitutions. Compound I (X = CH; R1 = 5-methoxy-2-pyrazinyl; R2 = H; R3 = R4 = F; R5 = F3CCH2OCH2) displayed acceptable overall in vitro properties and in vivo rat PK profile.

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Tetrahydropyran – Wikipedia,
Tetrahydropyran – an overview | ScienceDirect Topics

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 Visible-Light-Induced Radical Carbo-Cyclization/gem-Diborylation through Triplet Energy Transfer between a Gold Catalyst and Aryl Iodides, published in 2020-06-10, which mentions a compound: 16400-32-1, mainly applied to photochem cyclization diboration propargyl ether thioether amine preparation heterocycle; benzofuran benzothiophene indole diboronate preparation photochem diboration propargylic compound; gold diphosphine photocatalyst cyclization diboration propargyl ether thioether amine, Formula: C5H7Br.

Gem-Diboronates I (X = O, S, NBoc; R1 = H, halo, MeCO, MeO2C, tBu, CF3, MeSO2NH; R2 = H, Me, Et; R3 = H, Me, iPr, Bu) were prepared by photochem. diboration of propargylic substrates 2-I-R1C6H3XCHR3CCR2 with B2pin2 catalyzed by gold complex [Au2(μ-dppm)2(OTf)2] with up to 90% yields. Geminal diboronates have attracted significant attention because of their unique structures and reactivity. However, benzofuran-, indole- and benzothiophene-based benzylic gem-diboronates, building blocks for biol. relevant compounds, are unknown. A promising protocol using visible light and aryl iodides for constructing valuable building blocks, including benzofuran-, indole- and benzothiophene-based benzylic gem-diboronates, via radical carbo-cyclization/gem-diborylation of alkynes with a high functional group tolerance is presented. The utility of these gem-diboronates has been demonstrated by a ten gram scale conversion, by versatile transformations, by including the synthesis of approved drug scaffolds and two approved drugs, and even by polymer synthesis. The mechanistic investigation indicates that the merging of the dinuclear gold catalyst (photoexcitation by 315-400 nm UVA light) with Na2CO3 is directly responsible for photosensitization of aryl iodides (photoexcitation by 254 nm UV light) with blue LEDs light (410-490 nm, λmax = 465 nm) through an energy transfer (EnT) process, followed by homolytic cleavage of the C-I bond in the aryl iodide substrates.

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

Corey, Elias J.; McCaully, Ronald J.; Sachdev, Harbans S. published the article 《Asymmetric synthesis of α-amino acids. I. A new approach》. Keywords: amino acid via keto acid; keto acid amino acid via.They researched the compound: Ethyl indoline-2-carboxylate( cas:50501-07-0 ).Related Products of 50501-07-0. 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:50501-07-0) here.

Asymmetric synthesis of α-amino acids from α-keto acids using chiral reagents which are regenerated by the synthesis is described. The chiral reagents used were N-amino-2-hydroxymethylindolines (I). The synthesis, resolution, and assignment of absolute configuration for these reagents is described. The application of (I) to the asymmetric synthesis of α-amino acids depends on their combination with α-keto acids to form chiral hydrazono lactones. Reduction of the C:N unit in these lactones affords the corresponding hydrazino lactones which are transformed to α-amino acids by hydrogenolysis of the N-N linkage and ester hydrolysis. By this process D-alanine and D-butyrine were synthesized from pyruvic acid and α-oxobutyric acid in optical purities of 80 and 90%, resp. A solid basis exists for the design of chiral indoline reagents of still greater efficiency in the asymmetric synthesis of α-amino acids.

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

Recommanded Product: 50501-07-0. The fused heterocycle is formed by combining a benzene ring with a single heterocycle, or two or more single heterocycles. Compound: Ethyl indoline-2-carboxylate, is researched, Molecular C11H13NO2, CAS is 50501-07-0, about Convenient synthesis of dioxopiperazines via aminolysis of α-(pyruvylamino) esters. Author is Marshall, J. A.; Schlaf, T. F.; Csernansky, J. G..

Dioxopiperazines I and II were prepared from indoline III by cyclizing with MeNH2 to give dioxopiperazine IV, which was dehydrated to methylene compound V. V added AcSH to give I and II. Analogous reactions starting with pyrrole VI gave dioxopiperazine VII.

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

SDS of cas: 16400-32-1. 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: 1-Bromo-2-pentyne, is researched, Molecular C5H7Br, CAS is 16400-32-1, about One-Pot Oxidative C-H Activation/Aza-Prins-Type Reaction of Tertiary Alkynylamines: A Counter Ion-Induced Iminium Ion-Alkyne Cyclization. Author is Orejarena Pacheco, Julio Cesar; Pusch, Stefan; Geske, Leander; Opatz, Till.

Herein, the design and development of a new one-pot and metal-free oxidative C-H activation/aza-Prins type cyclization of alkynylamines was reported. The scope of this method was demonstrated by the preparation of ten new pyrido[2,1-a]isoquinolines I [R1 = R2 = H, OMe; R3 = H, Ph, 2-thienyl, etc.; R4 = H, Et; stereo = cis, trans] in moderate to high yields (38-92%). Furthermore, a mechanistic proposal for the alkyne aza-Prins cyclization was described based on DFT calculations

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

Shinde, Sopan Valiba; Kulkarni, Mandar; Talukdar, Pinaki published an article about the compound: (S)-(2,2-dimethyl-[1,3]-dioxolan-4-yl)-methylamine( cas:82954-65-2,SMILESS:NC[C@@H]1OC(C)(C)OC1 ).Computed Properties of C6H13NO2. 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:82954-65-2) through the article.

Self-assembly of a 1,2-diol appended naphthalene diimide derivative featuring chiral and J-type aggregation was reported. In methylcyclohexane/CHCl3, the compound exhibited intense yellow excimer and thermoreversible “”sol-gel”” behavior. Morphol. and CD studies revealed long range M-helical nanofibre formation. A theor. model of the cooperative hydrogen bonding was also proposed.

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Reference:
Tetrahydropyran – Wikipedia,
Tetrahydropyran – 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 An Expeditious Route for the Synthesis of Oxazepine Triazolo-β-Lactams through Intramolecular Metal-Free [3+2] Azide-Alkyne Cycloaddition, published in 2020, which mentions a compound: 16400-32-1, Name is 1-Bromo-2-pentyne, Molecular C5H7Br, Formula: C5H7Br.

A copper-free intramol. azide-alkyne cycloaddition reaction of 4-hydroxymethyl-β-lactam with sodium azide was described. The present approach involves the incorporation of an alkyne moiety through O-alkynylation of 3-hydroxy β-lactam with various propargylic halides. The generality of the method was demonstrated by treating the corresponding tosylates or mesylates of the hydroxymethyl functionality of a variety of β-lactam-tethered terminal and internal alkynes with sodium azide in a one-pot three-step reaction to furnish novel oxazepane-β-lactam fused triazole scaffolds of diverse interest in good yield.

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