Studies on Stable Diazoalkanes as Potential Fluorogenic Reagents. I. 7-Substituted 4-Diazomethylcoumarins

概要

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As a new type of stable diazoalkane, 4-diazomethylcoumarins (4) bearing various 7-substituents were prepared for potential use in introducing fluorophores into acidic substances. Selenium dioxide oxidation of 4-methylcoumarins to the corresponding coumarin-4-carbaldehydes followed by triethylamine-mediated Bamford-Stevens reaction of their tosylhydrazones readily gave 4 as excellently stable and almost non-fluorescent crystals, exhibiting characteristic diazomethyl ^1H- and ^<13>C-nuclear magnetic resonance signals. Labeling reactions of carboxylic acids using 4 in refluxing chloroform in the presence of silica gel catalyst gave excellent yields of fluorescent coumarin-4-ylmethyl esters. In view of their stability, accessibility and fluorogenicity, these compounds (4), especially those bearing 7-methoxy and 7-acetyloxy substituents, should be practically useful fluorogenic reagents for carboxylic acids.
社団法人日本薬学会の論文
1983-09-25