作者:Hiroki Takezawa、Kosuke Shitozawa、Makoto Fujita
DOI:10.1038/s41557-020-0455-y
日期:2020.6
When an amide group is distorted from its planar conformation, the conjugation between the nitrogen lone pair and the π* orbital of the carbonyl is disrupted and the reactivity towards nucleophiles is enhanced. Although there are several reports on the synthesis of activated twisted amides, amide activation through mechanical twisting is much less common. Here, we report twisted amides that are stabilized
当酰胺基团的平面构象变形时,氮孤对与羰基的π*轨道之间的共轭被破坏,对亲核试剂的反应性增强。尽管有关于活化的扭曲酰胺的合成的报道,但通过机械扭曲进行酰胺活化的情况要少得多。在这里,我们报告了扭曲的酰胺,这些酰胺通过包含在自组装的配位笼中而得以稳定。当Td对称笼中包含仲芳族酰胺时,顺式-扭曲构型比跨平面构型更受青睐-单晶X射线衍射分析证明-酰胺可扭曲高达34° 。由于这种变形的结果,酰胺的水解在被包含时被显着加速。