Tag: M.W:100-200

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 Development and Synthesis of DNA-Encoded Benzimidazole Library, published in 2018-05-14, which mentions a compound: 21778-81-4, mainly applied to preparation DNA conjugated benzimidazole library NK3 receptor antagonist; DNA tagged fluoronitrobenzamide amine aldehyde; DNA-encoded library technology; benzimidazole, Quality Control of 5-Methoxy-1H-indole-2-carbaldehyde.

Encoded library technol. (ELT) is an effective approach to the discovery of novel small-mol. ligands for biol. targets. A key factor for the success of the technol. is the chem. diversity of the libraries. Here we report the development of DNA-conjugated benzimidazoles. Using 4-fluoro-3-nitrobenzoic acid as a key synthon, we synthesized a 320 million-member DNA-encoded benzimidazole library using Fmoc-protected amino acids, amines and aldehydes as diversity elements. Affinity selection of the library led to the discovery of a novel, potent and specific antagonist of the NK3 receptor.

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Pyridazine – Wikipedia,
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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: 21778-81-4, is researched, SMILESS is O=CC(N1)=CC2=C1C=CC(OC)=C2, Molecular C10H9NO2Journal, ACS Catalysis called Cooperative N-heterocyclic Carbene and Iridium Catalysis Enables Stereoselective and Regiodivergent [3 + 2] and [3 + 3] Annulation Reactions, Author is Zhang, Jian; Gao, Yan-Shan; Gu, Bu-Ming; Yang, Wu-Lin; Tian, Bo-Xue; Deng, Wei-Ping, the main research direction is pyrroloindole preparation enantioselective diastereoselective regioselective; indolyl allyl carbonate enal cyclization carbene iridium catalyst; formylcyclopropane enal cyclization carbene iridium catalyst; pyridineindole preparation enantioselective diastereoselective regioselective; enal indolyl allyl carbonate cyclization carbene iridium catalyst.Formula: C10H9NO2.

A cooperative N-heterocyclic carbene (NHC)/iridium catalysis has been developed to achieve highly stereoselective and regiodivergent [3 + 2] and [3 + 3] annulation reactions of 2-indolyl allyl carbonates I (R = H, Me; R1 = H, OMe, Me, F, Cl; R1 = H, OMe, Cl) with enals R3CH=CHCHO (R1 = Ph, hexyl, 4-chlorophenyl, furan-2-yl, etc.). The use of the NHC catalyst has introduced switchable homoenolate and enolate intermediates from the common enal precursor via a simple adjustment of reaction conditions in a predictable manner. This protocol furnishes two types of biol. important products, pyrrolo[1,2-a]indoles II and pyridine[1,2-a]indoles III, with high diastereo- and enantioselectivities (up to >20:1 dr and >99% ee). Notably, all four stereoisomers of these products with two vicinal stereocenters could be afforded through permutations of the enantiomers of the two chiral catalysts. Mechanistic investigations and further computational d. functional theory calculations give an explanation of the origin of the regioselectivity. In addition, the NHC-enolate intermediate generated from formylcyclopropanes IV (R4 = Ph, tert-Bu, naphthalen-2-yl, etc.) was also compatible in this cooperative catalytic system and thus the arsenal of optically pure pyrrolo[1,2-a]indole products V was enriched.

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Related Products of 39977-42-9. 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: Methyl 5-(hydroxymethyl)picolinate, is researched, Molecular C8H9NO3, CAS is 39977-42-9, about Simultaneous dehalogenation and hydrogenation reduction of halogen-heteroaromatic aldehydes. Author is Chen, Xi-Bo; Hu, Qiu-Peng; Yuan, Qian-Jia; Ding, Wei; Ren, Jiangmeng; Zeng, Bu-Bing.

Treatment of halo-heteroaromatic aldehydes with a catalytic amount of PdCl2 under atm. pressure of H2 in base medium (NaOAc) leads to the corresponding dehalogenated primary alcs. The reaction system was especially effective for heteroaromatic compounds bearing aldehyde groups and halides (Br or Cl).

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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 Unusual blue-shifted acid-responsive photoluminescence behavior in 6-amino-8-cyanobenzo[1,2-b]indolizines, published in 2016, which mentions a compound: 21778-81-4, Name is 5-Methoxy-1H-indole-2-carbaldehyde, Molecular C10H9NO2, Category: pyridazine.

6-Amino-8-cyanobenzo[1,2-b]indolizines, a new class of photoluminescent materials, exhibit reversible pH-dependent optical properties characterized by an uncommon and dramatic blue shift in fluorescence emission when protonated. Acid titration and NMR spectroscopy experiments reveal that, rather than the anticipated N-protonation, C-protonation and loss of aromaticity is responsible for the observed photophys. changes. Efficient synthesis from indole-2-carboxaldehydes makes variously substituted versions of this nucleus readily available to tune optical and pH effects.

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Pyridazine – Wikipedia,
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The chemical properties of alicyclic heterocycles are similar to those of the corresponding chain compounds. Compound: 5-Methoxy-1H-indole-2-carbaldehyde, is researched, Molecular C10H9NO2, CAS is 21778-81-4, about Three-Step One-Pot Synthesis of 1,4-Dihydropyrazolo[4,3-b|indoles Using Copper Catalysis, the main research direction is dihydropyrazoloindole preparation; formylindole hydrazine cyclization microwave irradiation copper catalyst.Synthetic Route of C10H9NO2.

A convenient three-step one-pot copper-catalyzed method has been developed for the preparation of pyrazolo[4,3-b]indoles, new indole-based compounds with potential biol. activity. Treatment of various hydrazines, including alkyl hydrazines, with indole-2-carbaldehydes generated the corresponding products in moderate to good yields without protection of the indole N-1 moiety. In addition, LiOH was used as a base in the copper-catalyzed coupling reaction. Microwave heating was used to accelerate the iodination of indoles and the C-N bond formation.

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Pyridazine – Wikipedia,
Pyridazine | C4H4N2 – 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 Discovery of Potent N-Ethylurea Pyrazole Derivatives as Dual Inhibitors of Trypanosoma brucei and Trypanosoma cruzi, published in 2020-03-12, which mentions a compound: 136725-55-8, Name is (R)-(-)-3-Fluoropyrrolidine Hydrochloride, Molecular C4H9ClFN, Formula: C4H9ClFN.

Trypanosoma brucei (T. brucei) and Trypanosoma cruzi (T. cruzi) are causative agents of parasitic diseases known as human African trypanosomiasis and Chagas disease, resp. Together, these diseases affect 68 million people around the world. Current treatments are unsatisfactory, frequently associated with intolerable side-effects, and generally inadequate in treating all stages of disease. In this paper, we report the discovery of N-ethylurea pyrazoles that potently and selectively inhibit the viability of T. brucei and T. cruzi. Sharp and logical SAR led to the identification of 54 as the best compound, with an in vitro IC50 of 9 nM and 16 nM against T. b. brucei and T. cruzi, resp. Compound 54 demonstrates favorable physicochem. properties and was efficacious in a murine model of Chagas disease, leading to undetectable parasitemia within 6 days when CYP metabolism was inhibited.

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Pyridazine – Wikipedia,
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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 Gold(I)-Catalyzed Synthesis of Tetrahydrocarbazoles via Cascade [3,3]-Propargylic Rearrangement/[4+2] Cycloaddition of Vinylindoles and Propargylic Esters, published in 2016, which mentions a compound: 21778-81-4, Name is 5-Methoxy-1H-indole-2-carbaldehyde, Molecular C10H9NO2, Quality Control of 5-Methoxy-1H-indole-2-carbaldehyde.

A gold(I)-catalyzed cascade [3,3]-propargylic rearrangement and [4+2] cycloaddition reaction of 2-vinylindoles, e.g., I, with propargylic esters R3CH(OZ)(C=CR4) (R3 = CH3, C6H5, 4-FC6H4, etc.; R4 = H, Et, n-Pr, i-Pr, Ph; Z = pivaloyl, acetyl) has been reported. The reaction leads to the synthesis of highly substituted tetrahydrocarbazole derivatives, e.g., II, in high yields and diastereoselectivities. Furthermore, a preliminary screening for an asym. version of this reaction has been described.

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Reference:
Pyridazine – Wikipedia,
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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 Facile and efficient syntheses of novel (S)- and (R)-3-fluoropyrrolidines and 3,3-difluoropyrrolidine, published in 1995-01-31, which mentions a compound: 136725-55-8, mainly applied to fluoropyrrolidine enantiomeric synthesis; difluoropyrrolidine enantiomeric; pyrrolidine fluoro difluoro, Synthetic Route of C4H9ClFN.

Novel enantiomeric 3-fluoropyrrolidines and 3,3-difluoropyrrolidine were obtained in high yield starting from the enantiomerically pure and com. available (2S,4R)-4-hydroxyproline. Spray-dried potassium fluoride and diethylaminosulfur trifluoride were used to introduce one or two fluorine atoms, resp.

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The preparation of ester heterocycles mostly uses heteroatoms as nucleophilic sites, which are achieved by intramolecular substitution or addition reactions. Compound: (R)-(-)-3-Fluoropyrrolidine Hydrochloride( cas:136725-55-8 ) is researched.SDS of cas: 136725-55-8.Patrick, Donald A.; Gillespie, J. Robert; McQueen, Joshua; Hulverson, Matthew A.; Ranade, Ranae M.; Creason, Sharon A.; Herbst, Zackary M.; Gelb, Michael H.; Buckner, Frederick S.; Tidwell, Richard R. published the article 《Urea Derivatives of 2-Aryl-benzothiazol-5-amines: A New Class of Potential Drugs for Human African Trypanosomiasis》 about this compound( cas:136725-55-8 ) in Journal of Medicinal Chemistry. Keywords: aryl benzothiazolamine preparation trypanosomicide human African trypanosomiasis treatment. Let’s learn more about this compound (cas:136725-55-8).

A previous publication from this lab explored the antitrypanosomal activities of novel derivatives of 2-(2-benzamido)ethyl-4-phenylthiazole, which had been identified as a hit against Trypanosoma brucei, the causative agent of human African trypanosomiasis. While a number of these compounds, particularly the urea analogs, were quite potent, these mols. as a whole exhibited poor metabolic stability. The present work describes the synthesis of 65 new analogs arising from medicinal chem. optimization at different sites on the mol. The most promising compounds were the urea derivatives of 2-aryl-benzothiazol-5-amines. One such analog, (S)-2-(3,4-difluorophenyl)-5-(3-fluoro-N-pyrrolidylamido)benzothiazole (I) was chosen for in vivo efficacy studies based upon in vitro activity, metabolic stability, and brain penetration. This compound attained 5/5 cures in murine models of both early and late stage human African trypanosomiasis, representing a new lead for the development of drugs to combat this neglected disease.

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SDS of cas: 21778-81-4. Aromatic compounds can be divided into two categories: single heterocycles and fused heterocycles. Compound: 5-Methoxy-1H-indole-2-carbaldehyde, is researched, Molecular C10H9NO2, CAS is 21778-81-4, about Base-dependent formation of cis and trans olefins and their application in the synthesis of 5-oxo-ETE receptor antagonists. Author is Gore, Vivek; Chourey, Shishir; Ye, Qiuji; Patel, Pranav; Ouedraogo, Yannick; Gravel, Sylvie; Powell, William S.; Rokach, Joshua.

5-Oxo-ETE is the most potent eosinophil chemoattractant among lipid mediators. We have developed two 5-oxo-ETE receptor antagonists. In the course of the work, we have developed a procedure to selectively introduce a cis and trans double bond in an alkyl side chain. Reacting indolecarboxaldehydes with alkyl ylides using the Li base affords the trans olefins, whereas using the K base yields the cis olefins.

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Reference:
Pyridazine – Wikipedia,
Pyridazine | C4H4N2 – PubChem