(<i>R</i>)-DM-SEGPHOS–Ag(I)-Catalyzed Enantioselective Synthesis of Pyrrolidines and Pyrrolizidines via (1,3)- and Double (1,3)-Dipolar Cycloaddition Reactions
作者:Sumit K. Ray、Rayhan G. Biswas、Arun Suneja、Milon M. Sadhu、Vinod K. Singh
DOI:10.1021/acs.joc.7b03185
日期:2018.2.16
diastereo- and enantioselective route to access a wide range of highly substituted pyrrolidine and pyrrolizidine derivatives has been described via (1,3)- and double (1,3)-dipolar cycloaddition reactions catalyzed by the (R)-DM-SEGPHOS–Ag(I) complex. The reactions proceed smoothly at ambient temperature, affording a variety of pyrrolidines and pyrrolizidines in high yields (up to 93%) with up to 99:1 dr and
通过(R)-DM-SEGPHOS催化的(1,3)-和双(1,3)-偶极环加成反应,已经描述了一种有效的非对映和对映选择性途径,可用于广泛的高度取代的吡咯烷和吡咯烷并烷衍生物。–Ag(I)络合物。反应在环境温度下平稳进行,以高收率(高达93%)和高达99:1 dr的反应提供了各种吡咯烷和吡咯烷核苷,并且没有任何添加剂就具有出色的对映选择性(高达98%ee)。新合成的吡咯烷和吡咯烷衍生物分别包含四个和七个连续的立体异构中心。此外,已通过将对映体富集的产品转化为各种合成有用的高级中间体来证明其合成效用。