Homocamptothecin is emerging as an important topoisomerase I inhibitor originating in natural product camptothecin. We report the modifications and SAR of homocamptothecin on position C10 to develop potent topoisomerase I inhibitors for anticancer drug discovery. Based on click chemistry, twenty‐one 1,2,3‐triazole‐substituted homocamptothecin derivatives were readily synthesized in two steps. For A549
喜树碱是一种重要的拓扑异构酶I抑制剂,起源于喜树碱天然产物。我们报道了C10位置上喜树碱的修饰和SAR,以开发有效的拓扑异构酶I抑制剂用于抗癌药物的发现。根据点击化学,可以很容易地通过两个步骤合成二十一种1,2,3-三唑取代的同型喜树碱衍生物。对于A549,环烷基和烷基取代的化合物6j,6l和6o表现出高度的抗增殖抑制活性,IC 50值分别为30、30和50 n m。此外,环丙基6j的Topo I抑制活性高于20(S)喜树碱,表明适合进一步药物开发。
Azepine Synthesis from Alkyl Azide and Propargylic Ester via Gold Catalysis
作者:Heng Liu、Xin Li、Zili Chen、Wen-Xiang Hu
DOI:10.1021/jo300667a
日期:2012.6.1
multisubstituted 4, 5-dihydro-1H-azepine derivatives through the gold-catalyzed reaction of two molecules of propargylic esters with one molecule of alkyl azide. It was proposed that vinyl gold carbenoid, in situ generated from propargylic ester through gold-catalyzed 1, 2-rearrangement, was trapped by alkyl azide to give vinyl imine intermediate. These, in turn, could undergo a formal [4 + 3] cycloaddition with
通过金催化两分子炔丙酸酯与一分子烷基叠氮化物的金催化反应,开发了一种有效的新方法来合成多取代的4、5-二氢-1 H - ze庚因衍生物。有人提出,用烷基叠氮化物捕获炔丙基酯通过金催化的1、2-重排原位生成的乙烯基金类胡萝卜素,得到乙烯基亚胺中间体。这些反过来可能会与另一分子乙烯基金类胡萝卜素进行正式的[4 + 3]环加成反应,从而提供所需的氮杂产物。
A copper(<scp>ii</scp>)–thioamide combination as a robust heterogeneous catalytic system for green synthesis of 1,4-disubstituted-1,2,3-triazoles under click conditions
An efficient and practical synthesis of 1,4-disubstituted-1,2,3-triazoles underclickconditions using a copper(II)–thioamide combination as an efficient heterogeneous catalyst is disclosed. Mild reactionconditions and high yields make this method an attractive option for the preparation of triazole derivatives. The key to this procedure was the generation of Cu(I) required for the azide-alkyne cycloaddition
Steering Siglec-Sialic Acid Interactions on Living Cells using Bioorthogonal Chemistry
作者:Christian Büll、Torben Heise、Niek van Hilten、Johan F. A. Pijnenborg、Victor R. L. J. Bloemendal、Lotte Gerrits、Esther D. Kers-Rebel、Tina Ritschel、Martijn H. den Brok、Gosse J. Adema、Thomas J. Boltje
DOI:10.1002/anie.201612193
日期:2017.3.13
Sialic acid sugars that terminate cell‐surface glycans form the ligands for the sialic acid binding immunoglobulin‐like lectin (Siglec) family, which are immunomodulatory receptors expressed by immune cells. Interactions between sialic acid and Siglecs regulate the immune system, and aberrations contribute to pathologies like autoimmunity and cancer. Sialic acid/Siglec interactions between living cells