Novel adamantane-bearing anilines and properties of their supramolecular complexes with β-cyclodextrin
摘要:
Several novel anilines bearing 1-adamantyl substituents that are useful for drug modification were synthesised from the corresponding 1-adamantyl (nitrophenyl) ketones. The host-guest systems of these prepared ligands with beta-cyclodextrin (beta-CD) were studied using electrospray ionisation mass spectrometry, NMR spectroscopy, titration calorimetry and semi-empirical calculations. The complexes with 1: 1 stoichiometry were found to predominantly exist as pseudorotaxane-like threaded structures with the adamantane cage sitting deep in the cavity of beta-CD close to the wider rim. Such geometry was observed for all examined amines and is independent of their structure and/or presence of protic substituents.
Photocatalytic decarboxylative alkylations mediated by triphenylphosphine and sodium iodide
作者:Ming-Chen Fu、Rui Shang、Bin Zhao、Bing Wang、Yao Fu
DOI:10.1126/science.aav3200
日期:2019.3.29
variety of alkylations. Science, this issue p. 1429 A cheap combination of sodium iodide and triphenylphosphine can act as an electron-transfer catalyst under visible light. Most photoredox catalysts in current use are precious metalcomplexes or synthetically elaborate organic dyes, the cost of which can impede their application for large-scale industrial processes. We found that a combination of triphenylphosphine
A B(C6F5)3H2O-catalyzed defluorinative functionalization of tertiary aliphaticfluorides is described that proceeds under benign reaction conditions. The synthetic utility of the method is exemplified through the fast and efficient formation of a range of products with newly installed C(sp3) N, S, C and O bonds. This study illustrates the broad reactivity of otherwise inert starting materials and provides
描述了在良性反应条件下进行的AB(C 6 F 5)3 H 2 O催化的叔脂肪族氟化物的脱氟官能化。通过快速有效地形成一系列具有新安装的C(sp 3)N,S,C和O键的产品,可以举例说明该方法的综合用途。这项研究说明了其他惰性原料的广泛反应性,并提供了通往有价值的和合成上代表性不足的产品的途径,这些产品以前从未从此类氟化前体中获得。
Palladium-Catalyzed Dual Ligand-Enabled Alkylation of Silyl Enol Ether and Enamide under Irradiation: Scope, Mechanism, and Theoretical Elucidation of Hybrid Alkyl Pd(I)-Radical Species
作者:Bin Zhao、Rui Shang、Guang-Zu Wang、Shaohong Wang、Hui Chen、Yao Fu
DOI:10.1021/acscatal.9b04699
日期:2020.1.17
dual ligand effect and the irradiation effect in the catalytic cycle. The reaction is suggested to proceed via a hybrid alkyl Pd(I)-radical species generated by inner-sphere electron transfer of phosphine-coordinated Pd(0) species with alkyl bromide. This intriguing hybrid alkyl Pd(I)-radical species is elucidated by theoretical calculation to be a triplet species coordinated by three phosphine atoms
Carbon–carbon bond formation by radical addition–fragmentation reactions of O-alkylated enols
作者:Yudong Cai、Brian P. Roberts、Derek A. Tocher、Sarah A. Barnett
DOI:10.1039/b407215b
日期:——
opening of the cyclopropyldimethylcarbinyl radical, the ketene acetal H2C=C(OCMe2C3H5-cyclo)OTBS reacts with two molecules of N-methyl- or N-phenyl-maleimide to bring about [3 + 2] annulation of onemolecule of the maleimide, and then to link the bicyclic moiety thus formed to the second molecule of the maleimide via an alkylation-carboxymethylation reaction.
Alcohols as electrophiles: iron-catalyzed Ritter reaction and alcohol addition to alkynes
作者:Latisha R. Jefferies、Silas P. Cook
DOI:10.1016/j.tet.2014.03.072
日期:2014.7
iron-based catalytic system allows for a straightforward method for the synthesis of primary, secondary, and tertiary amides. The system also allows the addition of benzyl alcohols across phenylacetylene to produce substitutedphenylketones. This transformation improves and expands the substrate scope beyond that previously reported and proceeds under mild reaction conditions, tolerating air and moisture