Convenient synthesis of spiroindole derivatives via palladium-catalyzed cyclization of propargyl chlorides
作者:Akira Iwata、Shinsuke Inuki、Shinya Oishi、Nobutaka Fujii、Hiroaki Ohno
DOI:10.1016/j.tet.2015.05.006
日期:2015.9
Herein, we report the palladium-catalyzed cyclization reactions of indoles bearing a propargyl chloride side chain at their 3-position. In the presence of an external nucleophile, such as a sulfonamide or malonate, indoles bearing a propargyl group at their 3-position gave fused tetracyclic spiroindolines preferentially. However, in the absence of an external nucleophile, the same substrates afforded
在此,我们报道了在其3-位带有炔丙基氯侧链的吲哚的钯催化的环化反应。在外部亲核试剂如磺酰胺或丙二酸酯的存在下,在其3-位带有炔丙基的吲哚优先产生稠合的四环螺二氢吲哚。然而,在没有外部亲核试剂的情况下,相同的底物提供了螺吲哚。本文还提出了将催化不对称螺环化发展到炔丙基钯物种上的尝试。