Synthon chemistry: theoretical study on the formation of proline, phenylanaline and tyrosine

Gheorghe Surpateanu1, Ana-Maria Georgescu2, Ileana-Denisa Nistor2, Neculai Catalin Lungu3

1 Academy of Romanian Scientists (ARS), 3 Ilfov Street, District 5, Bucharest, Romania
2 Vasile Alecsandri University of Bacau, Department of Chemical and Food Engineering, 157 Calea Marasesti, 600115, Bacau, Romania
3 Al.I. Cuza University of Iasi, Faculty of Chemistry, Department of Organic Chemistry and Biochemistry, 11 Carol I Blvd., 700506, Iasi, Romania

Abstract


According to the "synthon theory" on the formation of the first proteinogenic amino acids from three synthons: methylene, nitrene and carbon monoxide, at low temperatures, aziridinone would have formed. This, in contact with the same three synthons, forms the precursors of the 20 proteinogenic amino acids. These precursors, on contact with the components of the primary atmosphere, formed the first proteinogenic amino acids. The aim of this paper is to find the interradical reactions, which would have formed the precursors of proline, phenylalanine and tyrosine. The paper is a continuation of other studies on obtaining these amino acids in order to correlate them with their essential and non-essential character. As procedure, the quantitative results: enthalpies of formation, enthalpies of reaction, free energies, profile of reaction pathways were obtained by DFT calculations (B88-LYP).

Keywords


aziridinone; aziridinone radicals; phenylalanine; proline; tyrosine

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