Phosphorylation of nucleosides by P-N bond species generated from prebiotic reduced phosphorus sources.

P-N species e.g., amidophosphates readily phosphorylate organics, thereby overcoming the so-called 'Phosphate Problem'. However, the formation of amidophosphates by plausible early Earth geochemical pathways is limited. We herein show that ammonolysis of the prebiotically plausible dimer of phosphite, pyrophosphite, readily affords amidophosphite, the monomeric P-N derivative of phosphite. Amidophosphite then undergoes spontaneous oxidation to form monoamidophosphate (MAP) and diamidophosphate (DAP) at room temperature (yields of the inorganic P-N species up to 48%). Oxidation of amidophosphite is promoted by O, HO, ClO⁻ and by UV light irradiation (365 nm). Both amidophosphite and MAP and the crude reaction mixture react with nucleosides to form nucleotides with both phosphate and H-phosphonate (yields up to 65%) at 80 °C in the presence of urea, showing that monoamidated phosphorus compounds also willingly promote prebiotic reactions. This observation expands the range of P-N phosphorylating agents that can play a role in the chemical evolution of prebiotic molecules on the early Earth.