Topic
Benzopyran
About: Benzopyran is a research topic. Over the lifetime, 1889 publications have been published within this topic receiving 15235 citations.
Papers published on a yearly basis
Papers
More filters
••
TL;DR: The synthesis of the novel 3-amino-4-(diphenylamino)-1H-2-benzopyran-1-one is reported using a two-step methodology with a new mechanistic proposal to explain the formation of the latter based on previously reported precursors and the established conditions.
Abstract: Various synthetic methodologies to obtain 3,4-diaminoisocumarin nucleus have been reported and described. However, mechanistic analysis based on experimental evidence is lacking. Herein, we report the synthesis of the novel 3-amino-4-(diphenylamino)-1H-2-benzopyran-1-one using a two-step methodology with a new mechanistic proposal to explain the formation of the latter based on previously reported precursors and the established conditions. This compound was afforded in 80% yield.
••
TL;DR: In this paper, a series of new N-chlorobenzopyran-2-imines were prepared in moderate to good yields, by reacting sodium hypochlorite in an acidic medium with benzopyrin-2imines obtained via the Knoevenagel condensation.
Abstract: A series of new N-chlorobenzopyran-2-imines were prepared in moderate to good yields, by reacting sodium hypochlorite in an acidic medium with benzopyran-2-imines obtained via the Knoevenagel condensation. Some of the N-chlorobenzopyran-2-imines obtained are potential antiproliferating agents.
01 Jan 2012
TL;DR: In this article, the copper (II) complex of 4-methoxyphenyl benzopyran has been synthesized using microwave irradiation and characterized by different tools such as IR, electronic spectroscopy, elemental analysis, thermal analysis, and ESR analysis.
Abstract: The copper (II) complex of 4-methoxyphenyl benzopyran has been synthesized using microwave irradiation and characterized by different tools such as IR, electronic spectroscopy, elemental analysis, thermal analysis, and ESR spectroscopy. The mode of metal binding shows that the copper binds with the ligand through the nitrogen atoms of the amino and cyanide groups. The copper complex (Cu L (AC)2.2H2O) has been used in the homogenous oxidation of polyphenol 1,2,3-trihydroxybenzene in presence of H2O2 as a green oxidant to produce a first-order rate constant kcat = 3.45× 10 -3 s -1 and dissociation constant K' = 32.0 mM. The catalysis shows 1.4× 10 3 times rate enhancement in terms of the first-order rate constant compared to the uncatalyzed reaction under the same reaction conditions. The oxidation
••
TL;DR: The chiral benzopyran ((S)-(−)-I) represents a key intermediate for the synthesis of α-tocopherol and α -tocotrienol as mentioned in this paper.
Abstract: The chiral benzopyran ((S)-(—)-I) represents a key intermediate for the synthesis of α-tocopherol and α-tocotrienol.
••
TL;DR: In this article, it was shown that refluxing in chlorobenzene, ethyl benzene, or xylene, gave exclusively 1-(p-tolyloxymethyl)pyrano[2,3-c][1]benzopyran-5(3H)-one (2), whereas through an ionic or radical pathway 2-methyl-1-to-loxyloxybut-2-ynyloxy(2, 3-c)furo[2.5]-pyrone-4-one (3
Abstract: 3-(4-p-Tolyloxybut-2-ynyloxy)[1]benzopyran-2-one (1), when refluxed in chlorobenzene, ethyl benzene, or xylene, gave exclusively 1-(p-tolyloxymethyl)pyrano[2,3-c][1]benzopyran-5(3H)-one (2), whereas through an ionic or radical pathway 2-methyl-1-(p-tolyloxymethyl)furo[2,3-c][1]benzopyran-4-one (3) was the exclusive product.