The most reactive amide as a transition-state mimic for cis-trans interconversion.

Area of Science:

• Organic chemistry
• Biochemistry
• Structural biology

Background:

• Amide bond rotation is crucial for protein folding and function.
• Enzyme-catalyzed cis-trans interconversion of amides involves high-energy transition states.
• Twisted amides are rare and challenging to synthesize.

Purpose of the Study:

• To synthesize the parent 90°-twisted amide, 1-azatricyclo[3.1.1.1(3,7)]decan-2-one.
• To investigate its potential as a transition-state mimic.
• To understand the factors influencing amide group stabilization in a perpendicular conformation.

Main Methods:

• Novel synthetic route for 1-azatricyclo[3.1.1.1(3,7)]decan-2-one.
• Computational analysis of conformational preferences.
• Reactivity studies to assess stability.

Main Results:

• Successful synthesis of 1-azatricyclo[3.1.1.1(3,7)]decan-2-one, a rare 90°-twisted amide.
• Demonstrated dependence of conformational stabilization on methyl group substitution pattern.
• Identified compound 3 as the most reactive known amide.

Conclusions:

• The synthesized rigid tricyclic system effectively mimics high-energy amide transition states.
• This work provides insights into amide bond dynamics relevant to peptide and protein structure.
• The unprecedented reactivity of compound 3 opens new avenues for chemical and biological studies.