Pyrans are an important class of six-membered heterocyclic compounds, non-aromatic rings, composed of five carbon atoms and one oxygen atom, and contain two double bonds. The molecular formula of pyran is C5H6O, and there are two isomers. Pyrans, together with benzo derivatives, form scaffolds for a variety of drug applications, many of which are approved and promising candidates in clinical trials and recently isolated bioactive natural products.
Boronic acids and boronate esters are commonly used reagents in Suzuki–Miyaura coupling chemistry. Organoboron derivatives are common reagents for C–C bond formation, either through classical palladium-mediated transformations or through other newer coupling methods. Boronic esters and acids are potential intermediates in the manufacture of many active pharmaceutical ingredients (API).
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