级联酰化/ IMDAV /烯反应序列的第一个例子,导致N-芳基苯并[ f ]异吲哚-4-羧酸具有抗病毒活性
摘要:
易于获得的N-芳基-3-苯基烯丙基胺与马来酸酐之间的反应产生了意想不到的产物-多取代的氢化苯并[ f ]异吲哚-4-羧酸。:这种转变通过的步骤的以前未知的序列前进Ñ与马来酸酐,在中间的乙烯基芳烃的分子内Diels-Alder反应的烯丙胺的酰化Ñ -maleamide,并且前两个步骤的产物的阿尔德烯反应。选定的苯并[ f ]异吲哚显示出抗病毒活性。
Solvent-Free Synthesis, DNA-Topoisomerase II Activity and Molecular Docking Study of New Asymmetrically N,N'-Substituted Ureas
作者:Andressa Esteves-Souza、Claudio Rodrigues-Santos、Catarina Del Cistia、Daniel Silva、Carlos Sant'Anna、Aurea Echevarria
DOI:10.3390/molecules171112882
日期:——
A new series of asymmetrically N,N'-substituted ureas 20–25 was prepared using solvent free conditions, which is an eco-friendly methodology, starting with Schiff bases derived from cinnamaldehyde and p-substituted anilines, which are subsequently submitted to reduction reactions that afford the corresponding asymmetric secondary amines. All of the intermediates were prepared using solvent free reactions, which were compared to traditional methodologies. All of the reactions required a remarkably short amount of time and provided good yields when solvent free conditions were employed compared to other methodologies. The DNA-topoisomerase II-α (topo II-α) activity was evaluated in relaxation assays, which showed that all of the compounds inhibited the enzyme activity at 10 μM, except for urea 24. Furthermore, a molecular docking study indicated that the compounds 20–25 binding to the topo II-α are able to interact with the same binding site as the anticancer drug etoposide, suggesting that the ureas could inhibit the enzyme by the same mechanism of action observed for etoposide, which prevents re-ligation of the DNA strands.
Indium-Mediated Addition of γ-Substituted Allylic Halides to N-Aryl α-Imino Esters: Diastereoselective Production of β,β′-Disubstituted α-Amino Acid Derivatives with Two Contiguous Stereocenters
作者:Nayyar Ahmad Aslam、Vadla Rajkumar、Chennakesava Reddy、Makoto Yasuda、Akio Baba、Srinivasarao Arulananda Babu
DOI:10.1002/ejoc.201200254
日期:2012.8
γ-substituted allylic halides to N-aryl (including N-PMP) α-imino- and N-acylhydrazono esters and highly diastereoselective tailoring of functionalized γ,δ-unsaturated β,β′-disubstituted N-aryl α-amino acid derivatives, bearing two contiguous stereocenters is reported. Further N-allylation of the resulting γ,δ-unsaturated β,β′-disubstituted N-aryl amino acid derivatives followed by ringclosingmetathesis (RCM)
Chiral Brønsted Acid Catalyzed Enantioselective Phosphonylation of Allylamine via Oxidative Dehydrogenation Coupling
作者:Ming-Xing Cheng、Ran-Song Ma、Qiang Yang、Shang-Dong Yang
DOI:10.1021/acs.orglett.6b01514
日期:2016.7.1
A new strategy for the synthesis of chiral α-amino phosphonates by enantioselective C–H phosphonylation of allylamine with phosphite in the presence of a chiralBrønstedacid catalyst has been developed. This protocol successfully integrates direct C–H oxidation with asymmetric phosphonylation and exhibits high enantioselectivity.