Abstract
Cationic metallocene species, generated from Cp 2MCl 2 and AgClO 4 (M=Zr, Hf), were used for the glycosylation of catechin derivative 2 , enabling a concise synthesis of a glycosyl flavonoid, astilbin ( 1 ). Further study revealed the efficiency of this Lewis acidic species for S N1-type activation of the C(4) position of catechin derivative 11 , enabling selective substitution with various nucleophiles.
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