Benzopyrans

About: Benzopyrans is a research topic. Over the lifetime, 694 publications have been published within this topic receiving 8830 citations.

Triton-B-Catalyzed, Efficient, Solvent-Free Synthesis of Benzopyrans

Abstract: A convenient and microwave-promoted novel protocol for the syntheses of diverse kinds of substituted benzopyrans from the corresponding variety of substituted hydroxy acetophenones and keto compounds using benzyltrimethylammonium hydroxide (Triton-B) under solvent-free conditions has been developed. This protocol is mild and efficient than the other reported methods.

Unprecedented Intramolecular Nucleophilic Aromatic Additions of Allyloxy Anions to Diphenylphosphinoyl-Substituted Benzene Rings: A Facile Method for Preparing Multisubstituted Benzopyrans

Abstract: A new synthetic method for the preparation of multisubstituted benzopyrans that involves an intramolecular conjugate addition of allyloxy anions to diphenylphosphinoyl-substituted benzene rings is described. The intermediate anion is trapped with electrophiles providing benzopyrans that are readily oxidized with O 2 to intermediates containing a peroxide that is easily converted into benzopyran-2-ones (i.e. coumarins).

Diastereoselective [4+2] reactions of o-quinone methides with a chiral enol ether: Asymmetric synthesis of (+)-R-mimosifoliol

Abstract: The first examples of enantioselective [4+2] cycloadditions of o-quinone methides (o-QMs) are reported. Their cycloaddition with trans-2-phenyl-1-cyclohexanol derived vinyl ether produces chiral benzopyrans. This procedure offers access to chiral aliphatic benzylic carbons and is applied to the synthesis of (+)-R-mimosifoliol.

Method of using benzopyrans as antiparasitic agents

Abstract: This invention relates to a method for the control of helminths in homothermic domestic and farm animals by administering to said animals on anthelmintically effective amount of a benzopyran compound.