An 1,2-diaza-1,3-diene's cyclodimerization that provides symmetrical fully substituted 1-amino pyrroles through an unusual formal [3+2] reaction is investigated. The study has demonstrated that the presence of electron withdrawing groups on the terminal carbon atom of the azo-ene system is crucial for the success of the reaction. The synthesis occurs with complete regioselectivity and requires a very easy work-up procedure.

中文翻译：

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FeCl3-催化的 4-Carbonyl-1,2-diaza-1,3-diene 的 [3+2] 环二聚反应

研究了 1,2-二氮杂-1,3-二烯的环二聚反应，通过不寻常的正式 [3+2] 反应提供对称的完全取代的 1-氨基吡咯。研究表明，偶氮烯体系末端碳原子上吸电子基团的存在对反应的成功至关重要。该合成具有完全的区域选择性，需要非常简单的后处理程序。