Radical perfluoroalkylation – easy access to 2-perfluoroalkylindol-3-imines via electron catalysis
作者:Dirk Leifert、Denis G. Artiukhin、Johannes Neugebauer、Anzhela Galstyan、Cristian Alejandro Strassert、Armido Studer
DOI:10.1039/c6cc02284g
日期:——
Arylisonitriles (2 equivalents) react with alkyl and perfluoroalkyl radicals to 2-alkylated indole-3-imines via two sequential additions to the isonitrile moiety followed by homolyticaromaticsubstitution. The three component reaction comprises...
Total Synthesis of Luotonin and a Small Library of AB-Ring SubstitutedAnalogues by Cascade Radical Annulation of Isonitriles
作者:Dennis P. Curran、Raghuraman Tangirala、Smitha Antony、Keli Agama、Yves Pommier
DOI:10.1055/s-2005-918923
日期:——
A four-step total synthesis of luotonin is deployed to make a small library of AB-ring substituted analogues. These analogues show weak activity in a standard topoisomerase I mediated DNA cleavage assay.
Visible-Light-Induced Radical Cascade Cyclization: Synthesis of (20<i>S</i>)-Camptothecin, SN-38 and Irinotecan
作者:Yao Yuan、Wuheng Dong、Xiaoshuang Gao、Xiaomin Xie、Dennis P. Curran、Zhaoguo Zhang
DOI:10.1002/cjoc.201800358
日期:2018.11
irinotecan and SN‐38 were successfully synthesized by a photocatalyzed radical cascade cyclization from an N‐propargyl iodopyridinone and an arylisonitrile undervisiblelight with a ruthenium catalyst. This synthetic method provided a useful entry into composing camptothecin family of antitumor agents in good yields undermild reaction conditions without the use of heavy metal reagents.
Total and semisynthesis and in vitro studies of both enantiomers of 20-fluorocamptothecin
作者:Raghuram S. Tangirala、Rachel Dixon、Danzhou Yang、Attila Ambrus、Smitha Antony、Keli Agama、Yves Pommier、Dennis P. Curran
DOI:10.1016/j.bmcl.2005.07.074
日期:2005.11
Both enantiomers of 20-fluorocamptothecin and the racemate have been prepared by totalsynthesis. The (R)-enantiomer is essentially inactive in a topoisomerase-I/DNA assay, while the (S)-enantiomer is much less active than (20S)-camptothecin. The lactone ring of 20-fluorocamptothecin hydrolyzes more rapidly than that of camptothecin in PBS. The results provide insight into the role of the 20-hydroxy
A new strategy for constructing indolizino[1,2-b]quinolin-9(11H)-ones (ring cores of camptothecins) from readily available isocyanoarenes and N-(alkyl-2-yn-1-yl)pyridin-2(1H)-ones has been developed through a visible-light-induced radical cascade cyclization process. The reaction proceeds under mild conditions with fair to excellent yields. The easy introduction of substituents for both reactants and
从易得的异氰基芳烃和N-(烷基-2-yn-1-基)吡啶-2(n)合成吲哚并[1,2 - b ]喹啉9(11 H)-(喜树碱的环核)的新策略已经通过可见光诱导的自由基级联环化过程开发了1 H)-one。反应在温和的条件下进行,产率中等至优异。容易为两种反应物引入取代基以及反应对官能团的宽容度使其成为通向喜树碱及其衍生物核心的直接途径。