In this paper is proposed a new theory concerning the formation of the first proteinogenic amino acids and their corresponding polypeptides starting of three syntones: methylene, nitrene and carbon monoxide. First, at low temperature in nitrogen, these three syntones form aziridinone, an asimetric compound in special conditions. Next, by a series of radical chain, izomerization, cyclization, elimination and polymerization reactions, apparently without a well defined transition states are formed a series of precursor syntones. Finally, these more structured syntones at the contract with the components of primary atmosphere, especially with water, ammonia, hydrogen sulphide, even with carbon dioxide and methane offer the first proteinogenic amino acids and their first corresponding polypeptides. As a very important aspect, the aziridinone cycle furnish the backbone of proteinogenic amino acids. The formation of each proteinogenic amino acid moiety also as its participation to construction of polypeptide structures were estimated by two parameters: (1) the complex structural factor, F
e and (2) the participation coefficient, C
p respectively. Dominantly, the quantitative results given in this paper were acquired by structural, thermodynamical and reactivity studies using DGauss with the B88-LYP GGA energy functional with high integral accuracy. Finally, an experimental assembly for obtention of amino acids and polypeptides is proposed. Brief, the three initial syntones: CH2, NH and CO, in nitrogen form aziridinone. That, in reactions with the same three syntones form, the more structured syntone precursors of proteinogenic amino acids and polypeptides. At the contact with primary atmosphere components are formed the first proteinogenic amino acids and polypeptides. The first polypeptides appear from polypeptide precursors and not from proteinogenic amino acids.