Catalytic Enantioselective Henry Reactions of Isatins: Application in the Concise Synthesis of (
<i>S</i>
)‐(−)‐Spirobrassinin
作者:Lu Liu、Shilei Zhang、Fei Xue、Guangshun Lou、Haoyi Zhang、Shichao Ma、Wenhu Duan、Wei Wang
DOI:10.1002/chem.201101025
日期:2011.7.4
highly efficient, cupreine‐catalyzed, enantioselective Henry reaction of readily available isatins and nitroalkanes has been developed (see scheme). The products are produced in excellent yields and good enantioselectivities under mild reaction conditions and without chromatography. The utility of the strategy has been demonstrated in the facile synthesis of (S)‐(−)‐spirobrassinin without the need for
当isatin是猫!已经开发出了一种高效的,由铜氢化物催化的对映选择性亨利反应,该反应可容易获得的靛红和硝基烷烃(请参见方案)。在温和的反应条件下,无需色谱法,即可以优异的收率和良好的对映选择性生产产物。(S)-(-)-spirobrassinin的轻松合成中证明了该策略的效用,无需保护基团。