Direct α-Acylation of Alkenes via N-Heterocyclic Carbene, Sulfinate, and Photoredox Cooperative Triple Catalysis
作者:Kun Liu、Armido Studer
DOI:10.1021/jacs.1c01022
日期:2021.4.7
excellent functional group tolerance. Mechanistic studies reveal that these cascades proceed through a sequential radical addition/coupling/elimination process. In contrast to known triple catalysis processes that operate via two sets of interwoven catalysiscycles, in the introduced process, all three cycles are interwoven.
Enantioselective Hydroalkenylation of Olefins with Enol Sulfonates Enabled by Dual Copper Hydride and Palladium Catalysis
作者:Alexander W. Schuppe、James Levi Knippel、Gustavo M. Borrajo-Calleja、Stephen L. Buchwald
DOI:10.1021/jacs.1c02117
日期:2021.4.14
The catalytic enantioselective synthesis of α-chiral olefins represents a valuable strategy for rapid generation of structural diversity in divergent syntheses of complex targets. Herein, we report a protocol for the dual CuH- and Pd-catalyzed asymmetric Markovnikov hydroalkenylation of vinyl arenes and the anti-Markovnikov hydroalkenylation of unactivated olefins, in which readily available enol triflates
Asymmetric Hydroarylation of Vinylarenes Using a Synergistic Combination of CuH and Pd Catalysis
作者:Stig D. Friis、Michael T. Pirnot、Stephen L. Buchwald
DOI:10.1021/jacs.6b04566
日期:2016.7.13
and palladium catalysis. Judicious choice of ligand for both Cu and Pd enabled this hydroarylation protocol to work for an extensive array of aryl bromides and styrenes, including β-substituted vinylarenes and six-membered heterocycles, under relatively mild conditions.
本通讯中详细介绍了通过使用氢化铜 (I) 和钯催化对 1,1-二芳基烷烃的对映选择性合成,这是一种在一系列药物制剂和天然产物中发现的结构。对 Cu 和 Pd 配体的明智选择使这种加氢芳基化方案能够在相对温和的条件下用于广泛的芳基溴化物和苯乙烯,包括 β 取代的乙烯基芳烃和六元杂环。
Enantioselective CuH-Catalyzed Hydroacylation Employing Unsaturated Carboxylic Acids as Aldehyde Surrogates
作者:Yujing Zhou、Jeffrey S. Bandar、Stephen L. Buchwald
DOI:10.1021/jacs.7b04937
日期:2017.6.21
(CuH)-catalyzed coupling of α,β-unsaturated carboxylic acids to aryl alkenes to access chiral α-aryl dialkyl ketones is reported. A variety of substrate substitution patterns, sensitive functional groups, and heterocycles are tolerated in this reaction, which significantly expands the range of accessible products compared with existing hydroacylation methodology. Although mechanistic studies are ongoing, we propose
Carbazolyl-substituted quinazolinones as high-triplet-energy materials for phosphorescent organic light emitting diodes
作者:Dalius Gudeika、Dmytro Volyniuk、Viktorija Mimaite、Roman Lytvyn、Rita Butkute、Oleksandr Bezvikonnyi、Gintaras Buika、Juozas V. Grazulevicius
DOI:10.1016/j.dyepig.2017.03.066
日期:2017.7
with the glass transition temperatures ranging from 97 to 159 °C. Their solutions in tetrahydrofuran absorb electromagnetic radiation in the range of 210–420 nm and emit in the range of 350–600 nm. The Stokesshifts recorded for the dilute solutions of compounds ranged from 48 to 134 nm, while those observed for the solid films were similarly in the range of 46–113 nm. The highest fluorescence quantum