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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 first synthesis of 4,10-dihydro-3-hydroxy-3,methyl-1H,3H-pyrano[4,3-b][1]benzopyran-10-one, the basic skeleton in fulvic acid, was achieved by sequential cyclization, which involved hydrogenation of the boron complex of the dione as mentioned in this paper.
Abstract: The first synthesis of 4,10-dihydro-3-hydroxy-3-methyl-1H,3H-pyrano[4,3-b][1]benzopyran-10-one, the basic skeleton in fulvic acid, was achieved by sequential cyclization, which involved hydrogenation of the boron complex of the dione (5) obtained by regioselective cyclization of the acetal (4) with HCl in tetrahydrofuran.
2 citations
Patent•
25 Nov 1995
TL;DR: The use of benzopyran dyes for dyeing or printing synthetic materials was discussed in this article, with the use of iminocoumarins as their intermediates.
Abstract: Disclosed are benzopyran dyes of formula (I), wherein n is 1 or 2; X1 is oxygen or imino; X2 is cyano or carbamoyl; R?1 and R2? are C?1?-C13 alkyl, where the sum of the carbon atoms in R?1 and R2? must be at least 10, and R3 is hydrogen, C?1?-C6-alkyl, C1-C6 alkoxy, halogen, cyano, nitro, carbamoyl, C1-C4 mono- or dialkyl carbamoyl, sulfamoyl or C1-C4 mono- or dialkyl sulfamoyl. Disclosed also are iminocoumarins as their intermediates and the use of the new dyes for dyeing or printing synthetic materials.
2 citations
2 citations
2 citations
TL;DR: A series of twelve benzopyran linked pyrrolo[2,1-c][1,4]benzodiazepines (PBDs) have been synthesized and exhibit significant DNA-binding activity and excellent cytotoxic activity against various human cancer cell lines.
Abstract: A series of twelve benzopyran linked pyrrolo[2,1-c][1,4]benzodiazepines (PBDs) have been synthesized. They exhibit significant DNA-binding activity and excellent cytotoxic activity against various human cancer cell lines.
2 citations