已经开发了双功能方酰胺与吡唑啉-5-酮和硝基烯丙基乙酸盐催化的对映选择性形式[3 + 3]环化反应。具有两个相邻的立体中心的密集取代的四氢吡喃并[2,3- c ]吡唑以高度立体可控的方式获得。在非对映体和对映体选择性没有任何明显损失的情况下,实现了将环化产物代表性地转化为生物学上重要的稠合二氢异喹啉。
Synthesis and antitumor activity of selenium-containing quinone-based triazoles possessing two redox centres, and their mechanistic insights
作者:Eduardo H.G. da Cruz、Molly A. Silvers、Guilherme A.M. Jardim、Jarbas M. Resende、Bruno C. Cavalcanti、Igor S. Bomfim、Claudia Pessoa、Carlos A. de Simone、Giancarlo V. Botteselle、Antonio L. Braga、Divya K. Nair、Irishi N.N. Namboothiri、David A. Boothman、Eufrânio N. da Silva Júnior
DOI:10.1016/j.ejmech.2016.06.019
日期:2016.10
Selenium-containing quinone-based 1,2,3-triazoles were synthesized using click chemistry, the copper catalyzedazide-alkyne1,3-dipolarcycloaddition, and evaluated against six types of cancer cell lines: HL-60 (human promyelocytic leukemia cells), HCT-116 (human colon carcinoma cells), PC3 (human prostate cells), SF295 (human glioblastoma cells), MDA-MB-435 (melanoma cells) and OVCAR-8 (human ovarian
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.
Asymmetricα,γ-regioselective [3 + 3] formal cycloadditions of α,β-unsaturatedaldehydes and 2-nitroallylic acetates have been developed for the first time. These reactions proceeded through a domino Michael addition–Michael addition sequence via an unusual cascade dienamine–dienamine catalysis of a chiral secondary amine, and multifunctional cyclohexene derivatives were generally constructed in moderate
首次开发了α,β-不饱和醛与2-硝基烯丙基乙酸酯的不对称α,γ-区域选择性[3 + 3]形式环加成。这些反应通过手性仲胺的不同寻常的级联二烯胺-二烯胺催化,通过多米诺骨牌迈克尔加成-迈克尔加成序列进行,在简单地用K 2 CO 3处理后,通常以中等收率构建具有优良立体选择性的多功能环己烯衍生物。
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。
An Unusual Route to Synthesize Indolizines through a Domino S
<sub>N</sub>
2/Michael Addition Reaction Between 2‐Mercaptopyridine and Nitroallylic Acetates
作者:Suparna Roy
DOI:10.1002/ejoc.201801426
日期:2019.1.31
An unusual reactionbetween2‐mercaptopyridine and nitroallylic acetates has been demonstrated. The reaction is initiated by a dominosequence including an SN2 reaction at tertiary center followed by a Michael addition and removal of sulfur moiety to deliver substituted indolizines.
已证明2-巯基吡啶与乙酸烯丙酯之间存在异常反应。该反应由在三级中心包括S N 2反应的多米诺序列引发,然后进行迈克尔加成并去除硫部分以递送取代的吲哚嗪。