¹⁵NRORC: An Azine Labeling Protocol

Area of Science:

• Organic Chemistry
• Isotope Synthesis
• Medicinal Chemistry

Background:

• Nitrogen-15 (¹⁵N) labeled compounds are crucial for mechanistic studies and pharmaceutical development.
• Existing methods for synthesizing ¹⁵N-labeled heterocycles can be limited in scope or efficiency.

Purpose of the Study:

• To develop a practical and broadly applicable method for the synthesis of ¹⁵N-labeled azines.
• To demonstrate the utility of this method for generating labeled pharmaceuticals.

Main Methods:

• Activation of azine heterocycles using electron-deficient arenes.
• Substitution of the nitrogen atom with a ¹⁵N-labeled reagent via an ANRORC mechanism.
• Application to dearomative synthesis of reduced heterocyclic congeners.

Main Results:

• Achieved high isotopic enrichment of ¹⁵N-labeled azines.
• Demonstrated the method's applicability to a wide range of azine substrates.
• Successfully performed a dearomative formal synthesis of ¹⁵N-solifenacin.

Conclusions:

• The described method provides a facile and efficient route to ¹⁵N-labeled azines.
• This approach is valuable for synthesizing labeled pharmaceuticals and exploring heterocyclic chemistry.
• The method facilitates dearomative access to reduced nitrogen-containing heterocycles.