Stereoselective synthesis of (E)-3-arylideneindolin-2-imines from 3-diazoindolin-2-imines and hydrazones was achieved using copper bromide as the catalyst. The olefination reaction proceeded via copper-catalyzed aerobic oxidation of hydrazones to diazo compounds and copper-catalyzed cross coupling of two different diazo components in a tandem manner.

中文翻译：

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3-Diazindolin-2-亚胺与腙的烯烃化：(E)-3-Arylideneindolin-2-亚胺的立体选择性合成方法

以溴化铜为催化剂，以3-diazoindolin-2-亚胺和腙为原料立体选择性合成( E )-3-arylideneindolin-2-亚胺。烯化反应通过铜催化腙有氧氧化为重氮化合物和铜催化两种不同重氮组分以串联方式交叉偶联进行。