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Highly regioselective removal of the 7-O-acyl groups of the peracylated flavones, isoflavones, and flavonols (PhSH, imidazole, NMP) followed by effective glycosylation with glycosyl trifluoroacetimidates (BF(3).Et(2)O) and cautious deprotection of the acyl groups under basic conditions afforded the desired 7-O-flavonoid glycosides in satisfactory yields.
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Li et al. (2003) studied this question.
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