Highly Efficient and Mild Cascade Reactions Triggered by Bis(triphenyl)oxodiphosphonium Trifluoromethanesulfonate and a Concise Total Synthesis of Camptothecin
作者:Hai-Bin Zhou、Guan-Sai Liu、Zhu-Jun Yao
DOI:10.1021/ol0706307
日期:2007.5.1
efficient cascade methodology is reported to construct variously substituted indolizino[1,2-b]quinolin-9(11H)-ones. Efficiently triggered by bis(triphenyl)oxodiphosphonium trifluoromethanesulfonate under mild conditions, this cascade achieved significant enhancements in chemical yields. Utilizing this highly efficient domino reaction followed by a Sharpless dihydroxylation, an eight-step total synthesis
据报道,一种温和而有效的级联方法可构建各种取代的吲哚并[1,2-b]喹啉-9(11H)-酮。在温和的条件下,三氟甲磺酸双(三苯基)氧合二phosph有效地引发了该级联反应,化学收率得到了显着提高。利用这种高效的多米诺骨牌反应,然后进行无尖锐的二羟基化反应,喜树碱的八步全合成反应由已知的吡啶衍生物以直接方式完成,总收率为47%和95%ee。