Abstract
The condensation of acetylsalicylchloride with the morpholine enamine of cyclohexanone in the presence of triethylamine gave an adduct which was converted into tetrahydroxanthone (X) by treating with aqueous pyridine containing piperidine. The reaction was applied to condensation of the pyrrolidine enamine (VI) of 6,7-dimethoxychroman-3-one with acetyl tubaic acid chloride to afford dehydrorotenone (II).
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