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。
One-Pot Regioselective Synthesis of <i>meta</i>-Terphenyls via [3 + 3] Annulation of Nitroallylic Acetates with Alkylidenemalononitriles
作者:Elumalai Gopi、Irishi N. N. Namboothiri
DOI:10.1021/jo501193h
日期:2014.8.15
A highly efficient one-pot method has been developed for the synthesis of meta-terphenyls via a regioselective [3 + 3] annulation-elimination sequence involving Morita–Baylis–Hillman (MBH) acetates of nitroalkenes and alkylidenemalononitriles. The reaction takes place in a regioselective manner under mild conditions (Et3N, room temperature) to afford a wide variety of meta-terphenyls bearing aryl,
已开发出一种高效的一锅法,该方法通过区域选择性[3 + 3]消除硝基的序列,涉及硝基链烯和烷基亚甲基丙二酸酯的森田-贝利斯-希尔曼(MBH)乙酸酯合成方法,来合成间三联苯。该反应在温和的条件下(Et 3 N,室温)以区域选择性的方式进行,从而得到各种带有芳基,杂芳基和苯乙烯基的间-三联苯基。这种新颖的[3 + 3]环空反应利用了MBH乙酸酯的1,3-双亲电特性和亚烷基丙二腈的1,3-双亲核特性,并以包括S N 2'取代,分子内6-内-trig的级联方式进行迈克尔加法和双重淘汰。还已经证明了产物的代表性合成转化,例如,转化为间-叔苯基衍生的异吲哚啉酮。
Stereocontrolled Construction of Tetrahydropyrano[2,3-<i>c</i>]pyrazole Scaffold via an Organocatalyzed Formal [3 + 3] Annulation
作者:Yin Zheng、Lei Cui、Youming Wang、Zhenghong Zhou
DOI:10.1021/acs.joc.6b00196
日期:2016.5.20
enantioselective formal [3 + 3] annulation reaction with pyrazolin-5-ones and nitroallylic acetates has been developed. Densely substituted tetrahydropyrano[2,3-c]pyrazoles with two adjacent stereogenic centers are obtained in a highly stereocontrolled manner. Representative transformation of the annulation product to a biologically important fused dihydroisoquinoline is achieved without any appreciable loss
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。
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).