Synthesis of Isomerically Pure (<i>Z</i>)-Alkenes from Terminal Alkynes and Terminal Alkenes: Silver-Catalyzed Hydroalkylation of Alkynes
作者:Mitchell T. Lee、Madison B. Goodstein、Gojko Lalic
DOI:10.1021/jacs.9b09336
日期:2019.10.30
molecules and often are used as intermediates in organic synthesis. Many alkenes exist in two stereoisomeric forms (E and Z), which have different structures and different properties. The selective formation of the two isomers is an important synthetic goal that has long inspired the development of new synthetic methods. However, the efficient synthesis of diastereopure, thermodynamically less stable, Z-alkenes
烯烃是一类重要的化合物,常见于生物活性分子中,常被用作有机合成的中间体。许多烯烃以两种立体异构形式(E 和 Z)存在,它们具有不同的结构和不同的性质。两种异构体的选择性形成是一个重要的合成目标,长期以来一直激励着新合成方法的发展。然而,非对映纯、热力学稳定性较差的 Z-烯烃的有效合成仍然具有挑战性。在这里,我们展示了通过银催化的末端炔烃加氢烷基化,使用烷基硼烷作为偶联伙伴,有效合成非对映纯 Z-烯烃(Z:E > 300:1)。我们还描述了对底物范围的探索,这揭示了新方法的广泛官能团兼容性。