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Mechanistic Insight into the Origin of Stereoselectivity in the Ribose-Mediated Strecker Synthesis of Alanine.

Luca Legnani¹, Andrea Darù¹, Alexander X Jones¹

¹Department of Chemistry, Scripps Research, La Jolla, California 92037, United States.

Journal of the American Chemical Society

|May 12, 2021

Summary

This summary is machine-generated.

Chiral pentose sugars facilitate the production of enantioenriched amino acids from racemic aminonitriles. This research reveals the synergistic role of sugars and amino acids in the origin of homochirality in biomolecules.

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Area of Science:

Biochemistry
Astrobiology
Organic Chemistry

Background:

Chirality is fundamental to biological systems, with L-amino acids and D-sugars dominating.
The origin of this homochirality from abiotic precursors remains a significant scientific question.
Understanding the mechanisms that favor one enantiomer over another is crucial for origins of life research.

Purpose of the Study:

To investigate the hydrolytic kinetic resolution of racemic aminonitriles mediated by chiral pentose sugars.
To elucidate the role of sugars in the stereoselective synthesis of amino acids.
To explore the synergistic effects of sugars and amino acids in establishing homochirality.

Main Methods:

Experimental kinetic and spectroscopic analyses.
Density Functional Theory (DFT) computational studies.
Microkinetic modeling of reaction pathways.

Main Results:

Enantioenriched amino acids were successfully produced via kinetic resolution of racemic aminonitriles.
The study identified key intermediate species in the hydrolysis reaction.
Insights into the stereoselectivity of hydrolysis were gained, particularly in the ribose-alanine system.

Conclusions:

Chiral pentose sugars play a crucial role in the enantioselective synthesis of amino acids.
A synergistic interaction between sugars and amino acids promotes homochirality.
These findings support models for the emergence of homochirality in prebiotic environments.