Purines are heterocyclic aromatic compounds composed of linked pyrimidine and imidazole rings. In mammals, purines are most commonly expressed in DNA and RNA (including the purines adenine and guanine), as well as single-molecule nucleotides (adenosine triphosphate (ATP), adenosine diphosphate (ADP), adenosine monophosphate (AMP), cyclic AMP, and to a lesser extent guanosine triphosphate (GTP) and cyclic guanosine monophosphate (cGMP). Purines are also key elements of the following energy metabolism molecules: reduced nicotinamide adenine dinucleotide, nicotinamide adenine dinucleotide phosphate (NADPH), and coenzyme Q. Purines can also act as direct neurotransmitters; for example, adenosine may interact with receptors to modulate cardiovascular and central nervous system (CNS) function.
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Azetidines are an important class of saturated four-membered nitrogen-containing heterocyclic compounds. The research hotspots related to this structure mainly focus on two aspects: one is the research of pharmaceutical chemistry; the other is related to chiral azetidines, using rigid azetidine compounds as chiral ligands for asymmetric catalytic reactions. Many nitrogen-containing heterocycles play important roles in drug structures, and in many cases small structural changes can improve ligand selectivity and pharmacokinetic properties.
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