Substituted Diarylnorbornadienes and Quadricyclanes: Synthesis, Photochemical Properties, and Effect of Substituent on the Kinetic Stability of Quadricyclanes
作者:Kyle J. Spivack、Jesse V. Walker、Maria J. Sanford、Benjamin R. Rupert、Andrew R. Ehle、James M. Tocyloski、Aaron N. Jahn、Lyndsey M. Shaak、Obiamaka Obianyo、Karyn M. Usher、Felix E. Goodson
DOI:10.1021/acs.joc.6b02025
日期:2017.2.3
new method for the synthesis of diarylnorbornadiene derivatives. Through the use of a two-step procedure consisting of a tandem alkene insertion-Suzuki coupling reaction followed by a DDQ dehydrogenation, we have been able to synthesize derivatives with a wide variety of substituents. We also present the results of UV–visible spectroscopy studies and kinetics experiments that show the effect of substituent
Palladium-Catalyzed [2 + 2 + 2] Cocyclotrimerization of Benzynes with Bicyclic Alkenes: An Efficient Route to Anellated 9,10-Dihydrophenanthrene Derivatives and Polyaromatic Compounds
at ambient temperature to yield anellated 9,10-dihydrophenanthrene products 3a−r in moderate to excellent yields. The [2 + 2 + 2] cocyclotrimerization products from oxa- and azabicyclic alkenes can be applied for the synthesis of polyaromatics, substituted benzo[b]triphenylenes (8a−f), via a simple Lewis acid mediated deoxyaromatization in good yields. In addition the [2 + 2 + 2] products undergo retro
Selective Direct Heterocoupling of Alkenes Catalyzed by <i>in Situ</i> Generated Ruthenium Complexes
作者:Marc-Olivier Simon、Sylvain Darses
DOI:10.1021/jo4014854
日期:2013.10.4
describe a ruthenium-based catalytic system that allows the codimerization of cyclic alkenes and Michael acceptors. High yields and excellent stereoselectivities toward the exo-(E) adducts are obtained on a wide range of substrates with various functional groups. In addition, running the reaction in protic media leads to the reduced product resulting from the tandem codimerization/reduction sequence.
Identification of Selective Norbornane-Type Aspartate Analogue Inhibitors of the Glutamate Transporter 1 (GLT-1) from the Chemical Universe Generated Database (GDB)
作者:Erika Luethi、Kong T. Nguyen、Marc Bürzle、Lorenz C. Blum、Yoshiro Suzuki、Matthias Hediger、Jean-Louis Reymond
DOI:10.1021/jm100959g
日期:2010.10.14
A variety of conformationally constrained aspartate and glutamate analogues inhibit the glutamate transporter 1 (GLT-1, also known as EAAT2). To expand the search for such analogues, a virtual library of aliphatic aspartate and glutamate analogues was generated starting from the chemical universe database GDB-11 which contains 26.4 million possible molecules up to 11 atoms of C. N. O, F, resulting in 101026 aspartate analogues and 151285 glutamate analogues. Virtual screening was realized by high-throughput docking to the glutamate binding site of the glutamate transporter homologue from Pyrococcus horikoshii (PDB code: 1XFH) using Autodock. Norbornane-type aspartate analogues were selected from the top-scoring virtual hits and synthesized. Testing and optimization led to the identification of (1R*,2R*,3S*,4R*,6R*)-2-amino-6-phenethyl-bicyclo[2.2.1]heptane-2,3-dicarboxylic acid as a new inhibitor of GLT-1 with IC(50) = 1.4 mu M against GLT-1 and no inhibition of the related transporter EAAC1. The systematic diversification of ligands by enumeration with help of GDB followed by virtual screening, synthesis. and testing as exemplified here provides a general strategy For drug discovery.
Practical selective monohydrolysis of bulky symmetric diesters
作者:Jianjun Shi、Satomi Niwayama
DOI:10.1016/j.tetlet.2017.12.061
日期:2018.2
has been applied to monohydrolysis of several bulkyl symmetric diesters, including diethyl esters, dipropyl esters, and dibutyl esters. A greater proportion of a polar aprotic co-solvent, DMSO, and aqueous KOH appear to help improve the reactivity of bulky diesters compared to the corresponding dimethylesters. The procedure is mild and practical, yielding the corresponding half-esters in high yields