The synthesis of 3-aryl-4-nitrocyclohexanones has been achieved from the Morita–Baylis–Hillmanadducts of β-arylnitroethylenes. The strategy involves proline-catalyzed diastereoselective intramolecularMichaeladdition to obtain 3,4-trans-disubstituted cyclohexanones. This method provides a facile access to (±)-epibatidine analogues.
The Morita–Baylis–Hillman adducts of β-aryl nitroethylenes with other activated alkenes: synthesis and anticancer activity studies
作者:Mamta Dadwal、Renu Mohan、Dulal Panda、Shaikh M. Mobin、Irishi N. N. Namboothiri
DOI:10.1039/b512267h
日期:——
The Morita-Baylis-Hillman (MBH) adducts of beta-aryl nitroethylenes with methyl vinyl ketone (MVK) and acrylate, formed in moderate to good yield when mediated by imidazole/LiCl in THF at room temperature, inhibit HeLa cell proliferation by binding to tubulin.
Organocatalytic one-pot asymmetric synthesis of functionalized spiropyrazolones <i>via</i> a Michael-aldol sequential reaction
作者:Mamatha Amireddy、Kwunmin Chen
DOI:10.1039/c6ra13923j
日期:——
An efficient organocatalytic method was developed for synthesizing functionalized spiropyrazolone derivativescontainingfour contiguous stereogenic centres by using a Michael-aldol consecutivereaction. We applied a quinine-derived squaramide catalyst to catalyze a reaction between 3-methyl-1-aryl-2-pyrazolin-5-ones and (E)-5-nitro-6-aryl-hex-5-en-2-ones, realizing the desired spiropyrazolones in
Catalytic Reductive Recyclization of Functionalized Isoxazoline <i>N</i>-Oxides to Pyrrolizidine-3-ones
作者:Ilya V. Okladnikov、Svetlana A. Aksenova、Sema L. Ioffe、Alexey Yu. Sukhorukov
DOI:10.1021/acs.joc.3c02154
日期:2024.1.5
frequently found in natural products and pharmaceutically relevant substances. Herein, a strategy for the synthesis of polysubstituted pyrrolizidine-3-ones by catalytic reductive domino-type recyclization of properly functionalized isoxazoline N-oxides was developed. The process is diastereoselective, and one diastereomer (out of four possible ones) is predominant in many of the studied cases. Using the
Organocatalytic formal [5+1] annulation: diastereoselective cascade synthesis of functionalized six-membered spirocyclic indane-1,3-diones/oxindoles via Michael–aldol reaction
作者:Suparna Roy、Mamatha Amireddy、Kwunmin Chen
DOI:10.1016/j.tet.2013.07.084
日期:2013.10
An efficient cascade protocol has been developed for the diastereoselective synthesis of functionalized six-membered spirocyclic compounds. The reaction proceeded smoothly between indane 1,3-diones/oxindoles/coumaranone as the dinucleophilic components and (E)-5-nitro-6-aryl-hex-5-en-2-one as the dielectrophile to give the desired products with reasonable to high chemical yields (30-84%) and high levels of diastereoselectivities (upto >95:5 dr). The reaction proceeded smoothly via cascade Michael aldol reaction. (C) 2013 Elsevier Ltd. All rights reserved.