Abstract
AbstractThe first stereoselective syntheses of doubly linked (A‐type) oligocatechins, (+)‐procyanidin A2 and (+)‐cinnamtannin B1, have been achieved. Ethylenedioxy‐bridged flavans served as excellent platforms, thus allowing annulation with nucleophilic catechin units in a stereoselective manner. An additional key was the new synthetic approach to selectively protected nucleophilic catechin, thus enabling regioselective construction of the key dioxabicyclo skeleton of the A‐type oligocatechins.
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