Chemical modification and structure-activity relationships of pyripyropenes. 3. Synthetic conversion of pyridine-pyrone moiety
Structure-activity relationships of the pyridine-pyrone moiety in pyripyropene A (1), a potent acyl-CoA : cholesterol acyltransferase (ACAT) inhibitor of fungal origin, were studied. Several kinds of aromatic or hetero ring substituents for the pyridine moiety were synthesized using unique degradation reaction, following by gamma-acylation. All the six synthesized analogs decreased the inhibitory activity with 20 to 200 times larger IC50 values than that of 1. Furthermore, the pyridine-pyrone substituent also dramatically decrease the inhibitory activity. Thus, the pyridine-pyrone moiety is important for eliciting potent ACAT inhibition.
Obata
R
Research Center for Biological Function, Kitasato Institute, Kitasato University, Tokyo, Japan.
Sunazuka
T
Tian
Z
Tomoda
H
Harigaya
Y
Omura
S