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