Novel Carbazole‐Based<i>N</i>‐Heterocyclic Carbene Ligands to Access Synthetically Relevant Stilbenes in Pd‐Catalyzed Coupling Processes
作者:Tejpalsingh Ramsingh Girase、Anant R. Kapdi
DOI:10.1002/asia.201900419
日期:2019.8
A series of new carbazole‐based N‐heterocyclic carbene (NHC) ligands have been synthesized in a simple and facile synthetic route and subsequently used in a Pd/carbazole‐based NHC catalytic system, which was found to be effective in catalyzing Heck reactions to provide substituted stilbene derivatives in good yields. Several bioactive stilbenes, including pterostilbene, pinosylvin, trimethoxy resveratrol
Olefin cross-metathesis/Suzuki–Miyaura reactions on vinylphenylboronic acid pinacol esters
作者:Christine B. Baltus、Irina S. Chuckowree、Neil J. Press、Iain J. Day、Simon J. Coles、Graham J. Tizzard、John Spencer
DOI:10.1016/j.tetlet.2012.12.081
日期:2013.3
A series of alkenyl phenylboronic acid pinacol esters has been synthesized via an olefin cross-metathesis reaction of vinylphenylboronic acid pinacol ester derivatives. After catalytic hydrogenation, the resulting boronates were coupled via a microwave-mediated Suzuki-Miyaura reaction to afford a library of biarylethyl aryl and biarylethyl cycloalkyl derivatives. A complementary reaction sequence involved an initial Suzuki-Miyaura coupling. Crown Copyright (C) 2012 Published by Elsevier Ltd. All rights reserved.
Solvatochromism in Diketopyrrolopyrrole Derivatives: Experimental and Computational Studies
作者:Rebecca S. Szabadai、Jesse Roth-Barton、Kenneth P. Ghiggino、Jonathan M. White、David J. D. Wilson
DOI:10.1071/ch14057
日期:——
synthesised and their solution absorption spectra characterised in a range of solvents of varying polarity. The absorption spectra of these diketopyrrolopyrrole derivatives exhibited significant negative solvatochromism. The behaviour is consistent with results of time-dependent density-functional theory calculations of excitation energies. Calculated electronic structures suggest that there is significant