Three syntheses of 3, 8-dimethyl-1 H-pyrano [4, 3-b][1] benzopyran-10-one, a model for the synthesis of the fungal metabolite, fulvic acid

FM Dean, M Al-Sattar, DA Smith

文献索引：Dean, Francis M.; Al-Sattar, Mohammad; Smith, Dennis A. Journal of the Chemical Society, Chemical Communications, 1983 , # 9 p. 535 - 536

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摘要

Compouds with the 1H-pyrano [4, 3-b][1] benzopyran-10-one nucleus characteristic of fulvic acid have been prepared by three methods from chromone precursors; the characteristic steps are (i) the acetylation of the 2-methyl group of 3-methoxymethyl-2, 6- dimethylchromone by acetyl chloride and lithium di-isopropylamide at–70° C,(ii) the acetylation of the 2-methyl group of 3-chloromethyl-2, 6-dimethylchromone by N, N- ...