Asymmetric organocatalytic anthrone additions to activated alkenes
作者:Alex Zea、Andrea-Nekane R. Alba、Natalia Bravo、Albert Moyano、Ramon Rios
DOI:10.1016/j.tet.2011.02.032
日期:2011.4
Asymmetric organocatalyticadditions of anthrones to activated alkenes are discussed. The reaction between anthrone or dithranol and α,β-unsaturated aldehydes is catalyzed by diphenylprolinol trimethylsilyl ether in toluene at −40 °C, giving the Michael adducts with good yields and enantioselectivities. Bifunctional amino-thioureas efficiently catalyze the additions of anthrones to both nitroalkenes and maleimides
Ionic liquid promoted Diels-Alder Reaction between anthrone and maleimides
作者:Nitin Mirgane、Sandip Kotwal、Anil Karnik
DOI:10.2478/s11532-009-0136-6
日期:2010.4.1
Ionicliquids (IL) are gaining importance as green solvents. Imidazolium ionicliquid [bmim]+[Cl]−, an environmentally benign solvent, was found to promote the Diels-Alderreaction between anthrone and maleimides at room temperature with excellent yields. The ionicliquid played a dual role as solvent and catalyst.
Simple chiral triethylsilyl-amino alcohol organocatalysts containing a bulky triethylsilyl group on the oxygen atom at the gamma-position were designed and synthesized as new organocatalysts for enantioselective Diels-Alder reactions of anthrones with maleimides to produce chiral hydroanthracene Diels-Alder adducts in up to 99% yield and with up to 94% ee. (c) 2015 Elsevier Ltd. All rights reserved.
Reversal of enantioselectivity induced by the achiral part of an organocatalyst in a Diels–Alder reaction
作者:Trupti S. Tawde、Swapnil J. Wagh、Jai V. Sapre、Vaibhav N. Khose、Purav M. Badani、Anil V. Karnik