SYNTHESIS OF PROCYANIDINS C2 AND C1 USING LEWIS ACID MEDIATED EQUIMOLAR CONDENSATION

[摘要]：Synthesis of procyanidins C2 and C1 was achieved via a stereoselective intermolecular condensation of equimolar amount of dimeric catechin or epicatechin nucleophile and monomeric catechin or epicatechin electrophile using Lewis acid. In the case of synthesis of procyanidin C2, AgBF4 and AgOTf afforded condensed product in excellent yield. As to the synthesis of procyanidin C1, Yb(OTf)(3) was effective for equimolar condensation.

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