Tweaking the acid-sensitivity of transiently thermoresponsive Polyacrylamides with cyclic acetal repeating units
作者:Simon Van Herck、Bruno G. De Geest
DOI:10.1007/s11426-019-9705-4
日期:2020.4
Abstract Merging the characteristics of thermoresponsive and stimuli-degradable polymers yields so-called transiently thermoresponsivepolymers, which can find application for the design of injectable gels, nanoparticles, etc. within a biomedical context. Among these polymers, only a limited number is reported which shows selective degradation under mild acidic conditions. However, extension of the library
The Mechanism of Gold(I)-Catalyzed Hydroalkoxylation of Alkynes: An Extensive Experimental Study
作者:Alexander Zhdanko、Martin E. Maier
DOI:10.1002/chem.201303795
日期:2014.2.10
An extensiveexperimentalstudy of the mechanism of gold(I)‐catalyzed hydroalkoxylation of internal alkynes has been conducted by using NMR spectroscopy. This study was focused on the organogold intermediates, observations of actual catalytic intermediates in situ, and the reaction kinetics that are involved in this reaction. Based on the experimental results, a complete mechanistic picture was established
Helquats as Promoters of the Povarov Reaction: Synthesis of 1,2,3,4‐Tetrahydroquinoline Scaffolds Catalyzed by Helicene‐Viologen Hybrids
作者:Paul E. Reyes‐Gutiérrez、Tynchtyk T. Amatov、Pavel Švec、Ivana Císařová、David Šaman、Radek Pohl、Filip Teplý、Lubomír Pospíšil
DOI:10.1002/cplu.202000151
日期:2020.10
are structurally linked to helicenes and viologens, and they represent an attractive field of research in chemistry and medicinal chemistry. In the present work they were used as catalysts for the synthesis of 1,2,3,4‐tetrahydroquinolines in good yields by the Povarov reaction. The substrate scope and the capability of different helquats to promote Povarov reactions are demonstrated. Studies to elucidate
Iron–Nickel Dual-Catalysis: A New Engine for Olefin Functionalization and the Formation of Quaternary Centers
作者:Samantha A. Green、Suhelen Vásquez-Céspedes、Ryan A. Shenvi
DOI:10.1021/jacs.8b05868
日期:2018.9.12
electron-deficient arenes, including Lewis basic heterocycles. Here we report a highly Markovnikov-selective, dual-catalytic olefin hydroarylation that tolerates arenes and heteroarenes of any electronic character. Hydrogen atom transfer controls the formation of branched products and arene halogenation specifies attachment points on the aromatic ring. Mono-, di-, tri-, and tetra-substituted alkenes yield Markovnikov