作者:Jean-Christophe Grenier-Petel、Shawn K. Collins
DOI:10.1021/acscatal.9b00248
日期:2019.4.5
and E-selectivity (25–99% yield, 17 → >99:1 E:Z, 27 examples). Importantly, “cross-dimerizations” of terminal alkynes that are typically rare are also possible and occur with unusually high levels of stereoselection. In addition, macrocyclic hydroalkynylations are reported in good to high yields, affording macrocyclic enyne motifs, which are found in numerous bioactive natural products
据报道,使用钴催化和有机染料4CzIPN的金属光氧化还原方法进行了光化学加氢烷基化。该方案无需催化化学计量的金属还原剂即可实现催化反应,通常需要将较高氧化态的钴配合物转化为活性较高的较低氧化态的化学计量的金属还原剂。加氢烷基化可提供良好的高产率和E选择性的1,3-烯炔(25–99 %的产率,17→> 99:1 E:Z(27个示例)。重要的是,通常也很少发生的末端炔烃的“交叉二聚化”,并且以异常高的立体选择水平发生。此外,据报道,大环加氢炔化反应具有良好的高收率,可提供大环烯炔基序,这些基序在许多具有生物活性的天然产物中都可以发现