Benzopyran

About: Benzopyran is a research topic. Over the lifetime, 1889 publications have been published within this topic receiving 15235 citations.

Preparation of 3,4-dihydro-2h-benzopyran derivative

Abstract: PURPOSE:To obtain the titled compound especially useful as a stabilizer for synthetic resins using inexpensive raw materials easily, by reacting a pyran derivative with an acid derivative in the presence of Lewis acid to give an alkene derivative, reacting it with a hydroquinone derivative in the presence of Lewis acid CONSTITUTION:A pyran derivative shown by the formula I (one of X and Z is H and the other together with Y forms a bond) is reacted with an acid derivative shown by the formula II (R is organic group; Q is halogen, or R COO; R is organic group) in the presence of Lewis acid to give an alkene derivative shown by the formula III, which is reacted with a hydroquinone shown by the formula IV (R is H or protecting group; R is H or lower alkyl; R and R are H, lower alkoxy of lower alkyl; R and R form CH=CHCH=CH) in the presence of Lewis acid to give a 3,4-dihydro-2H-benzopyran derivative shown by the formula V, which is prepared easily from the easily and inexpensively obtainable compound shown by the formula I

Method for coloring organic high-molecular material using benzopyran compound

Abstract: PURPOSE:To color an organic high-molecular material so as to provide a colored high-molecular material having vivid red color tone and excellent in coloring force and fastness by using a specific benzopyran-based compound. CONSTITUTION:The objective material is colored using a benzopyran-based compound of formula I (R and R are respectively H or a 1-4C alkyl; X is an imino or O atom; Y is H, an alkyl, alkoxy, halogen, cyano or nitro). Furthermore, this compound is preferably obtained by reacting, e.g. iminocumarins of formula II with malonic dinitrile of formula III in an organic solvent at 50-200 deg.C and, if necessary, hydrolyzing the reaction product in water or an orgnic solent in the presence of an acid.

3,4-dihydro-2h-1-benzopyran-derivatives

Abstract: The compound 6-acetyl-7-[5-(4-acetyl-3-hydroxy-2-propylphenoxy)pentyloxy]-3,4-dihyd ro-24-1-benzopyran-2-carboxylic acid, as well as its enantiomers, salts and lower alkyl esters, are useful in topically administrable dosage forms for the treatment of leukotriene-mediated dermal inflammations, such as psoriasis These compounds can be formulated into creams, ointments, lotions, gels and other types of compositions suitable for applying on the skin

(1R,3S)-1-(Aminomethyl)-3,4-dihydro-5,6-dihydroxy-3-phenyl-1H-2- benzopyran: A Potent and Selective D1 Agonist.

Abstract: Le compose du titre est un agoniste puissant et selectif du recepteur de la dopamine D1, in vitro et in vivo. On montre egalement une activite dopaminergique dans l'enantiomere 1R*,3S*. Ces composes peuvent aussi etre utilises comme sondes pour les recepteurs D1

Benzopyran-4-on derivatives and their production

Abstract: Novel benzopyran-4-on derivatives of the formula wherein R1 is hydrogen or hydroxy and R2 is lower alkyl and production theirof.