Readily accessible sp³-rich cyclic hydrazine frameworks exploiting nitrogen fluxionality

Area of Science:

• Medicinal Chemistry
• Organic Synthesis
• Drug Discovery

Background:

• Drug development success is linked to molecular complexity.
• Generating complex, three-dimensional scaffolds with stereochemical control is challenging.

Purpose of the Study:

• To develop a strategy for creating sp3-rich, non-planar heterocyclic scaffolds for drug discovery.
• To obviate the need for independent control over multiple stereogenic centers.

Main Methods:

• Asymmetric transfer hydrogenation using a tethered Ruthenium (Ru)-catalyst to produce enantiopure cyclic hydrazine building blocks.
• Iterative C-N functionalization at the nitrogen atoms of these building blocks.
• Principal Moment of Inertia (PMI) analysis, Nuclear Magnetic Resonance (NMR), and crystallographic studies.

Main Results:

• Efficient production of enantiopure cyclic hydrazines (up to 99% enantiomeric excess).
• Generation of diverse hydrazine and hydrazide-based chemical libraries through iterative functionalization.
• Demonstration of excellent shape diversity and three-dimensionality in the generated scaffolds.
• Confirmation of substituent orientation in 3D space controlled by a single stereogenic center.

Conclusions:

• The described strategy provides access to novel, complex molecular architectures suitable for drug discovery.
• The method allows for wide chemical diversification and generates scaffolds with inherent three-dimensionality.
• This approach simplifies the generation of stereochemically rich compounds, enhancing drug-like properties.