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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Coumarin occurs naturally in a variety of plants, such as lentils, sweet sawdust, vanilla grass, and sweet grass. Coumarin has a simple structure, benzopyrone, associated with different reaction centers. Coumarins are further subdivided into different classes: simple coumarins, pyranocoumarins, furanocoumarins, dicoumarins and isocoumarins. Coumarin derivatives are an important class of natural plant metabolites with various biological activities. They can also be synthesized artificially, and various synthetic coumarin derivatives (azoles, sulfonyls, furans, pyrazoles, etc.) have shown good anticancer, antitumor and antiproliferative activities. Coumarin derivatives are not only effective anticancer agents, but also possess minimum side effects. Based on different substitution patterns, these potential active substances show a great ability to modulate potential anticancer activities.
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