Naphthoquinone-based chalcone hybrids and derivatives: synthesis and potent activity against cancer cell lines
作者:Guilherme A. M. Jardim、Tiago T. Guimarães、Maria do Carmo F. R. Pinto、Bruno C. Cavalcanti、Kaio M. de Farias、Claudia Pessoa、Claudia C. Gatto、Divya K. Nair、Irishi N. N. Namboothiri、Eufrânio N. da Silva Júnior
DOI:10.1039/c4md00371c
日期:——
Naphthoquinone-based chalcone hybrids were synthesized and evaluated for their cytotoxic activity against four cancer cell lines and PBMC. Some of the hybrids exhibited promising anticancer activity with IC50 values < 1 μM.
Synthesis of Functionalized Arenopyrans and Arenylsulfanes by Reacting Nitroallylic Acetates with Arenols and Arenethiols
作者:Pallabita Basu、Robi Sikdar、Tarun Kumar、Irishi N. N. Namboothiri
DOI:10.1002/ejoc.201801132
日期:2018.11.8
reaction and an intramolecular 6‐endo‐trig cyclization takes place in a regio‐ and stereoselective manner to provide arenopyrans. Interestingly, the reaction of arenethiols under the same conditions provided nitroallylic thioethers through a direct SN2 reaction.
(3 + 3)涉及S N 2'反应和分子内6-内-trig环化的1,3-双亲电子硝基烯丙基乙酸酯和1,3-双亲核戊烯醇的环化和立体选择性方式提供槟榔。有趣的是,在相同条件下,芳硫醇的反应通过直接的S N 2反应提供了硝基烯丙基硫醚。
Asymmetric Synthesis of 2,2-Disubstituted Benzofuranones through an Organocatalytic Alkylation with Nitroallylic Acetates
作者:Dieter Enders、Long Zhao、Gerhard Raabe
DOI:10.1055/s-0037-1610337
日期:2019.3
Abstract The asymmetricallylic alkylation of benzofuran-3(2H)-ones with nitroallylic acetates has been achieved employing a bifunctional thiourea organocatalyst via SN2′ substitution. A series of 2,2-disubstituted benzofuranones bearing adjacent tetrasubstituted and tertiary stereocenters have been synthesized with moderate to good yields and very good stereoselectivities. The asymmetricallylic alkylation
摘要 苯并呋喃-3(2 H)-ones与硝基烯丙基乙酸酯的不对称烯丙基烷基化已经通过S N 2'取代使用双官能硫脲有机催化剂实现。已经合成了具有相邻的四取代和叔立体中心的一系列2,2-二取代的苯并呋喃酮,具有中等至良好的产率和非常好的立体选择性。 苯并呋喃-3(2 H)-ones与硝基烯丙基乙酸酯的不对称烯丙基烷基化已经通过S N 2'取代使用双官能硫脲有机催化剂实现。已经合成了具有相邻的四取代和叔立体中心的一系列2,2-二取代的苯并呋喃酮,具有中等至良好的产率和非常好的立体选择性。
Asymmetric synthesis of pyrano[2,3-c]pyrazoles via a cascade reaction between Morita–Baylis–Hillman acetates of nitroalkenes and pyrazolones
作者:Jin Xie、Feng Sha、Xin-Yan Wu
DOI:10.1016/j.tet.2016.05.033
日期:2016.7
The first organocatalytic enantioselective cascade reaction of Morita–Baylis–Hillman acetates of nitroalkenes with pyrazolones has been developed. With 20 mol % of chiral tertiary-amine squaramide, 1,4,5,6-tetrahydropyrano[2,3-c]pyrazoles were afforded in moderate yields (up to 71%) with excellent stereoselectivities (up to>99:1 dr and up to 98% ee).
Synthesis of tetrahydrothiopyrano[2,3-<i>b</i>]indoles <i>via</i> [3+3] annulation of nitroallylic acetates with indoline-2-thiones
作者:Pallabita Basu、Chiranjit Hazra、Thekke V. Baiju、Irishi N. N. Namboothiri
DOI:10.1039/c9nj04754a
日期:——
and stereoselective synthesis of thiopyran annulated indoles. It involves a base mediated cascade [3+3] annulation of indoline-2-thiones and nitroallylic acetates. The tetrahydrothiopyranoindoles which were formed in good yields and in a short reaction time could be easily transformed to triazole derivatives by taking advantage of the nitro group present in the skeleton.