Topic
Benzopyran
About: Benzopyran is a research topic. Over the lifetime, 1889 publications have been published within this topic receiving 15235 citations.
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TL;DR: The reaction of aromatic aldehyde, malononitrile and 1,3-cyclohexanediones in water in the presence of triethylbenzyl-ammonium chloride (TEBA) provides an efficient access to 3-cyano-substituted 2-...
Abstract: The reaction of aromatic aldehyde, malononitrile and 1,3-cyclohexanediones in water in the presence of triethylbenzyl-ammonium chloride (TEBA) provides an efficient access to 3-cyano-substituted 2-...
5 citations
TL;DR: Some compounds 2 and 4 showed a strong local anesthetic activity in mice and a platelet antiaggregating activity in vitro comparable to that of acetylsalicylic acid, as well as moderate analgesic, antiinflammatory and antiarrhythmic activities in rats and mice.
Abstract: The synthesis of ethyl or methyl 6-substituted 3-(benzoylamino)-2-oxo-2H-pyran-5-carboxylates 2 and 3-(benzoylamino)-7,8-dihydro-2H-1-benzopyran-2,5(6H)-diones 4 by reaction of hippuric acid in acetic anhydride with ethyl or methyl 2-dimethylaminomethylene-3-oxoalkanoates and 2-dimethylaminomethylene-1,3-cyclohexanediones, respectively, is described. Some compounds 2 and 4 showed a strong local anesthetic activity in mice and a platelet antiaggregating activity in vitro comparable to that of acetylsalicylic acid, as well as moderate analgesic, antiinflammatory and antiarrhythmic activities in rats and mice.
5 citations
TL;DR: In this paper, a series of photochromic diaryl benzopyrans fused with benzofuran have been prepared and tested for photo-chromic performance, showing bathochromic shifts in the UV and broad bands in the visible spectra.
Abstract: A series of photochromic diaryl benzopyrans fused with benzofuran have been prepared and tested for photochromic performance The four isomeric hydroxydibenzofurans were coupled with (un)substituted 1,1-diphenyl propargyl alcohols The resulting photochromic products show bathochromic shifts in the UV and broad bands in the visible spectra compared to 2,2-diaryl benzopyrans (2,2-diarylchromenes) It has also been found that the position of the benzofuran fusion has a profound effect on the visible spectrum and fade rate In addition to structure-property relationships, the synthesis of these compounds is discussed
5 citations
TL;DR: The 3,4-dibromo-2,2,6,8-tetramethyl-2H-[1]benzopyran with either organolithium reagents or magnesium generates the novel aryne as discussed by the authors.
5 citations
TL;DR: The review presents an overall survey of the synthesis, chemical reactivity, and biological activities of 4-oxo-4H-1-benzopyran-3-carboxaldehydes and some of its derivatives.
5 citations