Practical Demethylation of Podophyllotoxin and Efficient Preparation of 4‐Amino‐4‐deoxy‐4′‐demethylepipodophyllotoxin.

2012 
The regioselective demethylation of podophyllotoxin (I) is smoothly achieved using methionine and methylsulfonic acid in TFA or in acetone/water.
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