Straightforward α-Amino Nitrile Synthesis Through Mo(CO)₆ -Catalyzed Reductive Functionalization of Carboxamides

Area of Science:

• Organic Chemistry
• Synthetic Chemistry

Background:

• Amide reduction is a fundamental transformation in organic synthesis.
• Existing methods often lack chemoselectivity or require harsh conditions.

Purpose of the Study:

• To develop a novel, chemoselective method for synthesizing α-amino nitriles from amides.
• To demonstrate the broad applicability and scalability of the new synthetic route.

Main Methods:

• Selective reduction of amides to hemiaminals using molybdenum hexacarbonyl (Mo(CO)₆) and 1,1,3,3-tetramethyldisiloxane (TMDS).
• Trapping of the intermediate hemiaminal with a cyanide source to form α-amino nitriles.
• Demonstration of chemoselectivity in the presence of various functional groups (ketones, imines, aldehydes, acids).

Main Results:

• Straightforward synthesis of α-amino nitriles with high yields.
• High chemoselectivity, preserving sensitive functional groups.
• Successful scale-up experiments and derivatization into valuable products.
• Application in late-stage functionalization of drug molecules and prolinol derivatives.

Conclusions:

• The developed methodology provides an efficient and versatile route to α-amino nitriles.
• This method offers excellent chemoselectivity, making it suitable for complex molecule synthesis.
• The approach is applicable to late-stage functionalization, enhancing its utility in medicinal chemistry.