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The Most Twisted Acyclic Amides: Structures and Reactivity
Organic Letters ( IF 4.9 ) Pub Date : 2018-12-10 00:00:00 , DOI: 10.1021/acs.orglett.8b03175
Chengwei Liu 1 , Shicheng Shi 1 , Yongmei Liu 1, 2 , Ruzhang Liu 2 , Roger Lalancette 1 , Roman Szostak 3 , Michal Szostak 1
Affiliation  

The synthesis, crystal structures, and reactivity of the most twisted acyclic amides described to date are reported. Substitution at the nitrogen atom in simple benzamides with Ts and acyl or carbamate groups provides a unique way to achieve almost perpendicular twist in N-acyclic amides (τ = 77°, N = Ac; τ = 87°, N = Boc). The overlap between the Nlp and CO π* orbital is disrupted due to geometrical constraints around the N-substituents. The perpendicular acyclic twisted amides represent a transition state mimic of cis–trans peptide isomerization thus far only accessible by excessively twisted bridged lactams.

中文翻译:

最扭曲的无环酰胺:结构和反应性

报道了迄今为止描述的最扭曲的无环酰胺的合成,晶体结构和反应性。简单的苯甲酰胺中带有Ts和酰基或氨基甲酸酯基团的氮原子上的取代提供了一种独特的方法,可在N-无环酰胺中实现几乎垂直的扭曲(τ= 77°,N = Ac;τ= 87°,N = Boc)。Nlp和COπ*轨道之间的重叠由于N取代基周围的几何约束而中断。垂直的无环扭曲酰胺代表了顺式-反式肽异构化的过渡态模拟,到目前为止,只有过度扭曲的桥连内酰胺才能达到。
更新日期:2018-12-10
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