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Erythrose and Threose: Carbonyl Migrations, Epimerizations, Aldol, and Oxidative Fragmentation Reactions Under Plausible Prebiotic Conditions.
Chemistry : a European Journal 2022 November 12
The prebiotic generation of sugars in the context of origins of life studies is of considerable interest. Among the important intramolecular processes of sugars are carbonyl migrations and accompanying epimerizations. Herein we describe the carbonyl migration-epimerization process occurring down the entire carbon chain of chirally pure d-tetroses sugars under mild conditions. Employing chirally pure 1-13C-erythrose, 4-13C-erythrose and 1-13C-threose, we (1) identify all the species formed as the carbonyl migrates down the four-carbon chain and (2) assess the rates associated with the production of each of these species. Competing aldol reactions and oxidative fragmentation processes were also observed. Further observations of self-condensation of glycolaldehyde mainly yielding 2-keto-hexoses (sorbose and tagatose) and tetrulose also provides a basis for understanding the effect of carbonyl migrations on the product distribution in plausible prebiotic scenarios.
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