证明了钴(III)在N-亚硝基苯胺与炔烃的直接环化中独特的区域选择性和反应性,可方便地合成N-取代的吲哚。在钴(III)催化剂存在下,当使用不对称的间位取代的N-亚硝基苯胺时,观察到较高的区域选择性。此外,带有缺电子基团的内部炔烃在[Cp * Rh III ]催化的体系中几乎没有反应性,在这种转变中表现出良好的反应性。
Rhodium(III)-catalyzed synthesis of indoles from 1-alkylidene-2-arylhydrazines and alkynes via C–H and N–N bond cleavages
作者:Takanori Matsuda、Yuki Tomaru
DOI:10.1016/j.tetlet.2014.04.016
日期:2014.5
1-Alkylidene-2-arylhydrazines undergo annulative coupling with internal alkynes in the presence of a rhodium(III) catalyst and a copper(II) salt. The reaction proceeds through cleavage of the C–H and N–N bonds of hydrazines to afford 1,2,3-trisubstituted indole derivatives.
Cationic Cobalt(III) Catalyzed Indole Synthesis: The Regioselective Intermolecular Cyclization of N-Nitrosoanilines and Alkynes
作者:Yujie Liang、Ning Jiao
DOI:10.1002/anie.201511002
日期:2016.3.14
regioselectivity and reactivity of cobalt(III) in the direct cyclization of N‐nitrosoanilines with alkynes for the expedient synthesis of N‐substituted indoles is demonstrated. In the presence of a cobalt(III) catalyst, high regioselectivity was observed when using unsymmetrical meta‐substituted N‐nitrosoanilines. Moreover, internal alkynes bearing electron‐deficient groups, which are almost unreactive
证明了钴(III)在N-亚硝基苯胺与炔烃的直接环化中独特的区域选择性和反应性,可方便地合成N-取代的吲哚。在钴(III)催化剂存在下,当使用不对称的间位取代的N-亚硝基苯胺时,观察到较高的区域选择性。此外,带有缺电子基团的内部炔烃在[Cp * Rh III ]催化的体系中几乎没有反应性,在这种转变中表现出良好的反应性。