Add time:07/13/2019         Source:sciencedirect.com

The regioselective reductive demethylation of the O-methyldiosphenol functionality in the A ring of quassin (3) with chlorotrimethylsilane and sodium iodide furnished picrasin B (1). Swern oxidation of 1 furnished Δ2-picrasin B (2), and O-methylation of 2 regenerated quassin (3).

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