We have previously shown that some ellagitannins are potent inhibitors
of protein kinase C (PKC). On the basis of this finding, several seri
es of hexahydroxybiphenyl derivatives of ellagic acid were synthesized
as simple analogs of these ellagitannins and were evaluated for their
inhibitory effect against PKC. Compounds 23 and 26 were found to be p
otent inhibitors of PKC, while hexakis(benzyloxy)biphenyl derivatives
exhibited weak anti-PKC activity.