Versatile One‐Pot Synthesis of Polysubstituted Cyclopent‐2‐enimines from α,β‐Unsaturated Amides: Imino‐Nazarov Reaction,Angewandte Chemie International Edition

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Versatile One‐Pot Synthesis of Polysubstituted Cyclopent‐2‐enimines from α,β‐Unsaturated Amides: Imino‐Nazarov Reaction
Angewandte Chemie International Edition ( IF 16.1 ) Pub Date : 2018-07-12 , DOI: 10.1002/anie.201805641
Ting Fan ₁ , Ao Wang ₁ , Jia-Qi Li ₁ , Jian-Liang Ye ₁ , Xiao Zheng ₁ , Pei-Qiang Huang _{1,

2}

Affiliation

The imino‐Nazarov cyclization of the polysubstituted pentan‐1,4‐diene‐3‐imines was realized. To this aim, a one‐pot procedure involving reductive alkenyliminylation of α,β‐unsaturated secondary amides with potassium organotrifluoroborates, followed by acid‐catalyzed imino‐Nazarov cyclization of the polysubstituted pentan‐1,4‐diene‐3‐imine intermediates, was studied systematically. This mild, operationally simple, flexible, and high‐yielding protocol efficiently affords polysubstituted pentan‐1,4‐diene‐3‐imines, cyclopentenimines, and α‐amino cyclopentenones, which are useful scaffolds in organic synthesis. The substituent effect at the C2 position of the polysubstituted pentan‐1,4‐diene‐3‐imines was studied by means of density‐functional theory calculations. Results suggested that the electron‐donating group facilitates the imino‐Nazarov cyclization process.

中文翻译：

从α，β-不饱和酰胺中多官能一锅法合成多取代的环戊2-亚胺类化合物：亚氨基-纳扎罗夫反应

多取代的戊丹-1,4-二烯-3-亚胺的亚氨基-纳扎罗夫环化反应得以实现。为此，采用了一锅法，其中包括将α，β-不饱和仲酰胺与有机三氟硼酸钾进行还原性烯基亚氨基化，然后对多取代的戊丹-1,4-二烯-3-亚胺中间体进行酸催化的亚氨基-纳扎罗夫环化。有系统地研究。这种温和，操作简单，灵活且高产的方案有效地提供了多取代的戊丹-1,4-二烯-3-亚胺，环戊烯亚胺和α-氨基环戊烯酮，它们在有机合成中是有用的支架。通过密度泛函理论计算研究了多取代的戊丹-1,4-二烯-3-亚胺在C2位置的取代基效应。

更新日期：2018-07-12

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