Mild Synthesis of Asymmetric 2‘-Carboxyethyl-Substituted Fluoresceins
JOURNAL OF ORGANIC CHEMISTRY(2008)
摘要
Asymmetric fluoresceins bearing a carboxyethyl group in the chromophoric portion of the dyes were prepared by a reaction of substituted phthalic anhydride with a carboxyethyl substituted resorcinol analogue followed by a condensation with a second resorcinol analogue. In order to avoid an accumulation of symmetric side products, the second step was performed in two substeps: acid-catalyzed formation of a triphenylmethyl intermediate followed by base-catalyzed cyclization which furnished the desired dyes.
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关键词
Photochemical Synthesis
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