Abstract
TMSOTf-catalyzed intramolecular condensation for catechin and epicatechin units are described. A potential electrophile and a nucleophile were connected with diester linkers and TMSOTf-catalyzed condensation was examined. In comparison with intermolecular catechin and catechin condensation, the intramolecular condensation required high reaction temperature and reversed 3,4- cis product was obtained. The condensed product was transformed into the natural 3,4- cis (+)-catechin-(4β→8)-(+)-catechin dimer.
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