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。