An efficient coversion of catechine into 3,4-trans-leucocyanidin
Catechine was efficiently converted into 3,4-trans-leococyanidin by seven steps involving an acetoxylation at the benzylic position of catechine pentabenzyl ether, followed by hydrolysis, oxidation, deprotection, and stereoselective reduction, successively.
Stereoselective substitution of flavan skeletons: Synthesis of dryopteric acid
The C(4) acetoxylated catechin and epicatechin derivatives, 4 and 5, smoothly react with various nucleophiles under Lewis acidic conditions, giving C(4)-elaborated flavan-3-ols. Facile synthesis of dryopteric acid (3) was achieved.
Ohmori, Ken,Ushimaru, Naoko,Suzuki, Keisuke
p. 7753 - 7756
(2007/10/03)
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