23860-35-7Relevant articles and documents
Hydroxamic Acid-Piperidine Conjugate is an Activated Catalyst for Lysine Acetylation under Physiological Conditions
Mizumoto, Shinsuke,Xi, Siqi,Fujiwara, Yusuke,Kawashima, Shigehiro A.,Yamatsugu, Kenzo,Kanai, Motomu
, p. 833 - 839 (2020)
Lysine acylation of proteins is an essential chemical reaction for posttranslational modification and as a means of protein modification in various applications. N,N-Dimethyl-4-aminopyridine (DMAP) derivatives are widely-used catalysts for lysine acylatio
Metal complex, electroluminescent device containing metal complex and application of metal complex
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Paragraph 0154; 0161-0163, (2021/07/17)
The invention provides a metal complex, an electroluminescent device containing the metal complex and application of the electroluminescent device, the metal complex has an M(La)m(Lb)n structure, the metal complex provided by the invention can more effectively finely adjust the luminescence color and adjust the luminescence peak width, so that the half-peak width is narrowed, the luminescence color is more saturated, the device efficiency is improved, and the current efficiency and the external quantum efficiency are relatively high.
Fungal Dioxygenase AsqJ Is Promiscuous and Bimodal: Substrate-Directed Formation of Quinolones versus Quinazolinones
Einsiedler, Manuel,Jamieson, Cooper S.,Maskeri, Mark A.,Houk, Kendall N.,Gulder, Tobias A. M.
supporting information, p. 8297 - 8302 (2021/03/01)
Previous studies showed that the FeII/α-ketoglutarate dependent dioxygenase AsqJ induces a skeletal rearrangement in viridicatin biosynthesis in Aspergillus nidulans, generating a quinolone scaffold from benzo[1,4]diazepine-2,5-dione substrates. We report that AsqJ catalyzes an additional, entirely different reaction, simply by a change in substituent in the benzodiazepinedione substrate. This new mechanism is established by substrate screening, application of functional probes, and computational analysis. AsqJ excises H2CO from the heterocyclic ring structure of suitable benzo[1,4]diazepine-2,5-dione substrates to generate quinazolinones. This novel AsqJ catalysis pathway is governed by a single substituent within the complex substrate. This unique substrate-directed reactivity of AsqJ enables the targeted biocatalytic generation of either quinolones or quinazolinones, two alkaloid frameworks of exceptional biomedical relevance.
A Diverse Library of Chiral Cyclopropane Scaffolds via Chemoenzymatic Assembly and Diversification of Cyclopropyl Ketones
Nam, Donggeon,Steck, Viktoria,Potenzino, Robert J.,Fasan, Rudi
, p. 2221 - 2231 (2021/02/16)
Chiral cyclopropane rings are key pharmacophores in pharmaceuticals and bioactive natural products, making libraries of these building blocks a valuable resource for drug discovery and development campaigns. Here, we report the development of a chemoenzymatic strategy for the stereoselective assembly and structural diversification of cyclopropyl ketones, a highly versatile yet underexploited class of functionalized cyclopropanes. An engineered variant of sperm whale myoglobin is shown to enable the highly diastereo- and enantioselective construction of these molecules via olefin cyclopropanation in the presence of a diazoketone carbene donor reagent. This biocatalyst offers a remarkably broad substrate scope, catalyzing this reaction with high stereoselectivity across a variety of vinylarene substrates as well as a range of different α-aryl and α-alkyl diazoketone derivatives. Chemical transformation of these enzymatic products enables further diversification of these molecules to yield a collection of structurally diverse cyclopropane-containing scaffolds in enantiopure form, including core motifs found in drugs and natural products as well as novel structures. This work illustrates the power of combining abiological biocatalysis with chemoenzymatic synthesis for generating collections of optically active scaffolds of high value for medicinal chemistry and drug discovery.
Remote Directed Isocyanation of Unactivated C(sp3)-H Bonds: Forging Seven-Membered Cyclic Ureas Enabled by Copper Catalysis
Zhang, Hongwei,Tian, Peiyuan,Ma, Lishuang,Zhou, Yulu,Jiang, Cuiyu,Lin, Xufeng,Xiao, Xiao
supporting information, p. 997 - 1002 (2020/02/15)
Reported herein is an unprecedented copper-catalyzed site-selective ?-C(sp3)-H bonds activation of aliphatic sulfonamides for constructing the synthetically useful seven-membered N-heterocycles. A key to success is the use of in-situ-formed amide radicals, to activate the inert C(sp3)-H bond, and inexpensive TMSNCO, as a coupling reagent under mild conditions. To the best of our knowledge, this represents the first use of alkylamine derivatives as a five-membered synthon to prepare a seven-membered N-heterocycles.
PRODRUGS OF 4-((1R,3S)-6-CHLORO-3-PHENYL-2,3-DIHYDRO-1H-INDEN-1-YL)-1,2,2-TRIMETHYLPIPERAZINE AND 4-((1/R,3S)-6-CHLORO-3-(PHENYL-D5)-2,3-DIHYDRO-1H-INDEN-1-YL)-2,2-DIMETHY-1-(METHYL-D3)PIPERAZINE
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Page/Page column 14; 15, (2020/07/06)
The present invention relates to prodrugs of 4-((1R,3S)-6-chloro-3-phenyl-2,3-dihydro-1H-inden-1-yl)- 1,2,2-trimethylpiperazine in the form of 1a and 1b; and 4-((1R,3S)-6-chloro-3-(phenyl-d5)-2,3-dihydro- 1H-inden-1-yl)-2,2-dimethyl-1-(methyl-d
Palladium-Catalyzed Distal C?H Selenylation of 2-Aryl Acetamides with Diselenides and Selenyl Chlorides
Gu, Linghui,He, Meicui,Ma, Wenbo,Tan, Yuqiang,Wang, Yang,Wang, Yuchi,Zhang, Chunran
supporting information, p. 5708 - 5715 (2020/12/01)
A convenient and effective method of palladium-catalyzed C?H selenylation of the 2-aryl acetamides assisted with removable 8-aminoquinoline with readily available diselenides and selenyl chlorides has been developed. This selenylation reaction is scalable and tolerates a wide range of functional groups, providing a straightforward way of the preparing unsymmetrical diaryl selenides and dibenzoselene-pinone. Preliminary mechanistic studies indicated that a single-electron transfer type mechanism and facile C?H metalation are operative. (Figure presented.).
Copper-Catalyzed Amide Radical-Directed Cyanation of Unactivated Csp3-H Bonds
Zhang, Hongwei,Zhou, Yulu,Tian, Peiyuan,Jiang, Cuiyu
supporting information, (2019/03/19)
A method for site-selective intermolecular δ/?-Csp3-H cyanation of aliphatic sulfonamides is developed using TsCN as the cyanating reagent, catalyzed by a Cu(I)/phenanthroline complex. The mild, expeditious, and modular protocol allows efficient remote Csp3-H cyanation with good functional group tolerance and high regioselectivity. Mechanistic studies indicate that the reaction might proceed through a Cu(I)-mediated N-F bond cleavage to generate an amidyl radical, 1,5-HAT, and cyano group transfer of the resulting carbon radical with TsCN.
Synthetic Utility of N-Benzoyloxyamides as an Alternative Precursor of Acylnitrenoids for γ-Lactam Formation
Huh, Soohee,Hong, Seung Youn,Chang, Sukbok
supporting information, p. 2808 - 2812 (2019/04/17)
Described herein is the development of a new entry of acylnitrenoid precursors for γ-lactam synthesis via an intramolecular C-H amidation reaction. Upon Ir catalysis, N-benzoyloxyamides serve as efficient substrates to afford 5-membered amides. Mechanistic studies revealed that the generation of a putative Ir-carbonylnitrenoid via N-O bond cleavage is facilitated by the chelation of countercations. This protocol offers a convenient and step-economic route to γ-lactams starting from the corresponding carboxylic acids.
A General Approach to Site-Specific, Intramolecular C?H Functionalization Using Dithiocarbamates
Na, Christina G.,Alexanian, Erik J.
supporting information, p. 13106 - 13109 (2018/09/21)
Intramolecular hydrogen atom transfer is an established approach for the site-specific functionalization of unactivated, aliphatic C?H bonds. Transformations using this strategy typically require unstable intermediates formed using strong oxidants and have mainly targeted C?H halogenations or intramolecular aminations. Herein, we report a site-specific C?H functionalization that significantly increases the synthetic scope and convergency of reactions proceeding via intramolecular hydrogen atom transfer. Stable, isolable N-dithiocarbamates are used as precursors to amidyl radicals formed via either light or radical initiation to efficiently deliver highly versatile alkyl dithiocarbamates across a wide range of complex structures.
