17431-39-9Relevant academic research and scientific papers
COBALT-MEDIATED REACTIONS. A NEW SYNTHETIC APPROACH TO β-, χ- and δ-LACTAMS
Gill, G. Bryon,Pattenden, Gerald,Reynolds, Stephen J.
, p. 3229 - 3232 (1989)
Unsaturated carbamylcobalt salophens, e.g. (2), undergo homolytic cleavage (heating, sunlamp) producing carbamyl radicals , viz (4) which then undergo cyclisation, accompanied by trapping (with CoII or TEMPO) or dehydrocobaltation, leading to functionalised β-, χ-, and δ-lactams e.g. (3), (6), (8), (11), (13) and (16).
One-pot synthesis of a highly disperse core-shell CuO-alginate nanocomposite and the investigation of its antibacterial and catalytic properties
Habibi, Hassan,Mansourinejhad, Sanam,Saberi, Dariush,Shadi, Ahmad
, p. 199 - 211 (2021/12/30)
In this study, sodium alginate was extracted from Sargassum algae, collected from coastal waters of Bushehr, Persian Gulf, Iran and used as a stabilizing and wrapping agent for CuO nanoparticles. The synthesized nanocomposite was characterized by some spectroscopic and microscopic techniques, such as IR, XRD, Uv-vis, BET, BJH, zeta potential, SEM, TEM, HR-TEM, and XPS. The antibacterial effects of the CuO-alginate nanocomposite against some bacteria, isolated from a burn wound, were evaluated. The results showed that this nanocomposite had better antibacterial effects than its components onPseudomonas aeruginosaATCC 27853,Staphylococcus aureusATCC 12600,Streptococcus pyogenesATCC 19615, andStaphylococcus epidermidisATCC 49461. Among these,Staphylococcus aureusATCC 12600 was the most sensitive one to this nanocomposite, with the lowest minimum inhibitory concentration (2.08 mg mL?1) observed. Moreover, the synthesized nanocomposite showed good catalytic activity in the oxidative coupling of carboxylic acids withN,N-dialkylformamides toward the synthesis of amides.
Manganese Catalyzed Enantioselective Epoxidation of α,β-Unsaturated Amides with H2O2
Ottenbacher, Roman V.,Kurganskiy, Vladimir I.,Talsi, Evgenii P.,Bryliakov, Konstantin P.
supporting information, p. 2778 - 2782 (2021/04/29)
Herewith, we report the enantioselective epoxidation of electron-deficient cis- and trans-α,β-unsaturated amides with the environmentally benign oxidant H2O2. The catalysts - manganese complexes with bis-amino-bis-pyridine and structurally related ligands - exhibit reasonably high efficiency (up to 100 TON) and excellent chemo- and enantioselectivity (up to 100% and 99% ee, respectively). Crucially, the cis-enamides epoxidation enantioselectivity and yield are dramatically enhanced by the presence of NH-moiety, which effect can be explained by the hydrogen bonding interaction between the cis-enamide substrate and the manganese based oxygen transferring species. (Figure presented.).
LIPOXYGENASE INHIBITORS
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Paragraph 00601-00603, (2021/10/02)
Various embodiments of the present disclosure are directed to compounds having Formula (I), Formula (IA), Formula (IB), Formula (IC), Formula (ID), Formula (IE), and/or pharmaceutically acceptable salts thereof. The compounds can be suitable for inhibiting lipoxygenases, and/or treating associated diseases, such as Alzheimer's disease. In some embodiments, the compounds may be administered to a patient as part of a pharmaceutical formulation.
PCl3-mediated transesterification and aminolysis of tert-butyl esters via acid chloride formation
Wu, Xiaofang,Zhou, Lei,Li, Fangshao,Xiao, Jing
, p. 491 - 497 (2021/01/20)
A PCl3-mediated conversion of tert-butyl esters into esters and amides in one-pot under air is developed. This novel protocol is highlighted by the synthesis of skeletons of bioactive molecules and gram-scale reactions. Mechanistic studies revealed that this transformation involves the formation of an acid chloride in situ, which is followed by reactions with alcohols or amines to afford the desired products.
Chemoselective reduction of ?,¢-unsaturated carbonyl and carboxylic compounds by hydrogen iodide
Matsumoto, Shoji,Marumoto, Hayato,Akazome, Motohiro,Otani, Yasuhiko,Kaiho, Tatsuo
, p. 590 - 599 (2021/03/29)
The selective reduction of ?,¢-unsaturated carbonyl compounds was achieved to produce saturated carbonyl compounds with aqueous HI solution. The introduction of an aryl group at an ? or ¢ position efficiently facilitated the reduction with good yield. The reaction was applicable to compounds bearing carboxylic acids and halogen atoms. Through the investigation of the reaction mechanism, it was found that Michael-type addition of iodide occurred to produce ¢-iodo compounds followed by the reduction of C-I bond via anionic and radical paths.
Donor-acceptor fluorophores as efficient energy transfer photocatalysts for [2 + 2] photodimerization
Chen, Feng,Chen, Hao,Liu, Xue-Fen,Luo, Shu-Ping,Ren, Chen-Chao,Wu, Qing-An,Xu, Liang-Xuan,Yu, Xiao-Cong
, p. 3707 - 3716 (2020/06/03)
Mild [2 + 2] photodimerization of enone substrates was induced by donor-acceptor fluorophores. Enone substrates were activated efficiently for anti-head to head dimerizations with a high yield (up to 83%) and high selectivity. The adjustable excited state potential also allows donor-acceptor fluorophores to be used for isomerization of the above substrates, confirming the potential of donor-acceptor fluorophores as energy transfer photocatalysts.
Copper(I)-Catalyzed Asymmetric 1,4-Conjugate Hydrophosphination of α,β-Unsaturated Amides
Li, Yan-Bo,Tian, Hu,Yin, Liang
supporting information, p. 20098 - 20106 (2021/01/01)
A catalytic asymmetric conjugate hydrophosphination of α,β-unsaturated amides is accomplished by virtue of the strong nucleophilicity of copper(I)-PPh2 species, which provides an array of chiral phosphines bearing an amide moiety in high to excellent yields with excellent enantioselectivity. Furthermore, the dynamic kinetic resolution of unsymmetrical diarylphosphines (HPAr1Ar2) is successfully carried out through the copper(I)-catalyzed conjugate addition to α,β-unsaturated amides, which affords P-chiral phosphines with good-to-high diastereoselectivity and high enantioselectivity. 1H NMR studies show that the precoordination of HPPh2 to copper(I)-bisphosphine complex is critical for the efficient deprotonation by Barton's Base. Moreover, the relative stability of the copper(I)-(R,RP)-TANIAPHOS complex in the presence of excessive HPPh2, confirmed by 31P NMR studies, is pivotal for the high asymmetric induction, as the ligand exchange between bisphosphine and HPPh2 would significantly reduce the enantioselectivity. At last, a double catalytic asymmetric conjugate hydrophosphination furnishes the corresponding product in high yield with high diastereoselectivity and excellent enantioselectivity, which is transformed to a chiral pincer palladium complex in moderate yield. This chiral palladium complex is demonstrated as an excellent catalyst in the asymmetric conjugate hydrophosphination of chalcone.
Radical condensation between benzylic alcohols and acetamides to form 3-arylpropanamides
Azizi, Kobra,Madsen, Robert
, p. 7800 - 7806 (2020/08/14)
A new radical condensation reaction is developed where benzylic alcohols and acetamides are coupled to generate 3-arylpropanamides with water as the only byproduct. The transformation is performed with potassium tert-butoxide as the only additive and gives rise to a variety of 3-arylpropanamides in good yields. The mechanism has been investigated experimentally with labelled substrates, trapping experiments and spectroscopic measurements. The findings indicate a radical pathway where potassium tert-butoxide is believed to serve a dual role as both base and radical initiator. The radical anion of the benzylic alcohol is proposed as the key intermediate, which undergoes coupling with the enolate of the amide to form the new C-C bond. Subsequent elimination to the corresponding cinnamamide and olefin reduction then affords the 3-arylpropanamides.
Preparation method of cinnamamide (by machine translation)
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Paragraph 0022-0028, (2020/05/01)
The synthesis system disclosed by the invention has the advantages of simple :(1) reaction conditions, wide, reaction conditions, reaction conditions, wide ;(2) substrate range, high yield (1) and wide application range, and the reaction liquid, can be used as an anti-cancer drug, anti-anti-tumor and spice precursor compound in an organic solvent to prepare a corresponding cinnamide compound, product cinnamide . The synthesis system disclosed by the invention has a broad spectrum . The synthesis system disclosed by the invention has a broad spectrum of biological activity, and is suitable for popularization and application, in the following steps, synthesizing cinnamic acid and thiuram disulfide as a raw material, in an organic, solvent, and purifying, parts by mass, separation and purification of the obtained reaction, solution in an organic solvent. (by machine translation)
