3546-50-7Relevant articles and documents
Access to azolopyrimidine-6,7-diamines as a valuable “building-blocks” to develop new fused heteroaromatic systems
Gazizov, Denis A.,Fedotov, Victor V.,Chistyakov, Konstantin A.,Gorbunov, Evgeny B.,Rusinov, Gennady L.,Charushin, Valery N.
, (2021)
A simple and convenient approach for the synthesis of new azolopyrimidine-6,7-diamines has been developed by the method of reductive cleavage of azo-group in series 6-[2-(4-methylphenyl)diazenyl]azolo[1,5-a]pyrimidine-7-amines, which was obtained by the interaction of aminoazoles with [2-(4-methylphenyl)hydrazinylidene]-3-oxo-propionitrile. The proposed approach allows to use a wide range of aminoazoles as a starting reagent and it also distinguishes itself by the simplicity of isolation and purification of products. The synthetic potential of presented diamines was demonstrated by the reaction of obtaining azolo[a]annulated pteridines.
Prebiotic Origin of Pre-RNA Building Blocks in a Urea “Warm Little Pond” Scenario
Menor Salván,Bouza, Marcos,Fialho, David M.,Burcar, Bradley T.,Fernández, Facundo M.,Hud, Nicholas V.
, p. 3504 - 3510 (2020/10/02)
Urea appears to be a key intermediate of important prebiotic synthetic pathways. Concentrated pools of urea likely existed on the surface of the early Earth, as urea is synthesized in significant quantities from hydrogen cyanide or cyanamide (widely accepted prebiotic molecules), it has extremely high water solubility, and it can concentrate to form eutectics from aqueous solutions. We propose a model for the origin of a variety of canonical and non-canonical nucleobases, including some known to form supramolecular assemblies that contain Watson-Crick-like base pairs.The dual nucleophilic-electrophilic character of urea makes it an ideal precursor for the formation of nitrogenous heterocycles. We propose a model for the origin of a variety of canonical and noncanonical nucleobases, including some known to form supramolecular assemblies that contain Watson-Crick-like base pairs. These reactions involve urea condensation with other prebiotic molecules (e. g., malonic acid) that could be driven by environmental cycles (e. g., freezing/thawing, drying/wetting). The resulting heterocycle assemblies are compatible with the formation of nucleosides and, possibly, the chemical evolution of molecular precursors to RNA. We show that urea eutectics at moderate temperature represent a robust prebiotic source of nitrogenous heterocycles. The simplicity of these pathways, and their independence from specific or rare geological events, support the idea of urea being of fundamental importance to the prebiotic chemistry that gave rise to life on Earth.
Mapping the landscape of potentially primordial informational oligomers: Oligodipeptides tagged with 2,4-disubstituted 5-aminopyrimidines as recognition elements
Mittapalli, Gopi Kumar,Osornio, Yazmin M.,Guerrero, Miguel A.,Reddy, Kondreddi Ravinder,Krishnamurthy, Ramanarayanan,Eschenmoser, Albert
, p. 2478 - 2484 (2008/03/11)
(Chemical Equation Presented) Bit different: 2,4-Dioxo- and 2,4-diamino-5-aminopyrimidine nuclei attached to an oligodipeptide backbone display a disparity in their base-pairing strength which is opposite to that shown by corresponding triazines. This behavior points to a remarkable correlation between pairing strength and ΔpKa values of pairs of complementary bases.