The irradiation of chromone-2-carboxylic esters resulted in the stereo- and regioselective formation of C(2) chiral anti-HH dimers from the triplet excited state. On the contrary, photolysis in the solid-state gave anti-HT dimers exclusively controlled by molecular arrangement in the crystal.
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http://dx.doi.org/10.1021/ol101734k | DOI Listing |
Molecules
November 2019
CIQUP/Department of Chemistry and Biochemistry, Faculty of Sciences, University of Porto, Rua do Campo Alegre, 4169-007 Porto, Portugal.
6-Bromochromone-2-carboxylic acid () was synthesized by a microwave-assisted process. The optimization of the reaction was performed varying parameters, such as type of base/number of reagent equivalents, solvent, temperature and reaction time. The yield of the reaction was improved to 87%.
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October 2010
Department of Applied Chemistry and Biotechnology, Graduate School of Engineering, Chiba University, Yayoi-cho, Inage-ku, Chiba 263-8522, Japan.
Chirality
September 1993
Department of Pharmacology and Toxicology, St Mary's Hospital Medical School, Imperial College of Science, Technology and Medicine, London, England.
Following administration of 6-n-propylchromone-2-carboxylic acid (6-n-PCCA) (500 mumol/kg) to male rats, three metabolic products were detected and isolated from the 0-24 h urine. All were identified as resulting from oxidation exclusively along the 6-n-propyl moiety. Some 66% of the dose was excreted in the 0-24 h urine, 55% of which was 6-PCCA, with 15% as (6-1'-hydroxypropyl)chromone-2-carboxylic acid (6-1'-HPCCA), 22% as 6-(2'-hydroxypropyl)chromone-2-carboxylic acid (6-2'-HPCCA), and 4% as 6-3'-carboxypropyl)chromone-2-carboxylic acid (6-3'-CPCCA).
View Article and Find Full Text PDFChirality
September 1992
Department of Pharmacology and Toxicology, St. Mary's Hospital Medical School, Imperial College of Science, Technology and Medicine, London, United Kingdom.
6-n-Alkylchromone-2-carboxylic acids are metabolized solely by aliphatic oxidation. In the rabbit, the 6-n-propyl congener (PCCA) undergoes omega-1 hydroxylation exclusively. Following administration of PCCA to female Dutch rabbits (500 mumol/kg), some 77% of the dose was excreted in the urine, 41% as PCCA and 36% as 6-(2'-hydroxy-n-propyl)chromone-2-carboxylic acid.
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