Substrate-Controlled Co-MHAT Catalyzed 1,4- and 1,2-Hydropyridination of 1,3-Enynes

Area of Science:

• Organic Synthesis
• Catalysis
• Medicinal Chemistry

Background:

• 1,3-enynes possess unique structures leading to diverse reactivity in organic synthesis.
• While 1,2- and 1,4-difunctionalization of 1,3-enynes via radical processes are well-established, hydrofunctionalization remains less explored.
• Limited studies exist on the 1,2- and 1,4-hydrofunctionalization of 1,3-enynes.

Purpose of the Study:

• To develop an efficient method for the 1,4- and 1,2-hydropyridination of 1,3-enynes.
• To provide access to propargylpyridines and allenylpyridines using readily available starting materials.
• To explore the potential applications of the synthesized compounds in medicinal chemistry.

Main Methods:

• Utilized a reductive Cobalt-Metal-catalyzed Hydride Atom Transfer (Co-MHAT) process.
• Investigated the reaction conditions for optimal hydropyridination of various 1,3-enynes.
• Synthesized novel propargylpyridine and allenylpyridine derivatives.

Main Results:

• Achieved efficient 1,4- and 1,2-hydropyridination of 1,3-enynes.
• Demonstrated a wide substrate scope for 1,3-enynes and excellent functional group compatibility.
• Identified antiproliferative activity in the novel allenylpyridine products.

Conclusions:

• The developed Co-MHAT-catalyzed method offers an efficient route to valuable propargylpyridines and allenylpyridines.
• The synthesized allenylpyridines show promising antiproliferative activity, suggesting significant potential in medicinal chemistry.
• This work expands the synthetic utility of 1,3-enynes and contributes to the development of new therapeutic agents.