Abstract
Although the lithio derivative of the dimethylchromone 6c could be condensed with reactive organic electrophilic species and iodine to give, respectively, homologated at C-1′ (stigmatellin numeration) chromones and the iodide 6a, it proved impossible to convert efficiently either 6a or 6c into stigmatellin 1a by an anionic alkylation process.
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