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Chemical modification and structure-activity relationships of pyripyropenes. 2. 1,11-Cyclic analogs
1Research Center for Biological Function, Kitasato Institute, Kitasato University, Tokyo, Japan.
The Journal of Antibiotics
|November 1, 1996
Abstract:
A series of 1,11-cyclic analogs of pyripyropene A were prepared. Replacement of the 1,11-acyl groups of pyripyropenes with 1,11-cyclic acetals effectively improved in vitro acyl CoA:cholesterol acyltransferase (ACAT) inhibitory activity. Especially noteworthy is benzylidene acetal analog 35, the most potent inhibitor (IC50 = 5.6 nM) among the derivatives prepared so far, which showed 16 times more potent inhibitory activity than pyripyropene A.