New Analogs of the Pyripyropene Family of ACAT Inhibitors via<i>α</i>-Pyrone Fragmentation and<i>γ</i>-Acylation/Cyclization
作者:Rika Obata、Toshiaki Sunazuka、Zhiming Tian、Hiroshi Tomoda、Yoshihiro Harigaya、Satoshi Omura、Amos B. Smith, III
DOI:10.1246/cl.1997.935
日期:1997.9
The pyridine moiety of pyripyropene A was replaced with other aromatic and heteroaromatic substituents via α-pyrone degradation followed by dienolate γ-acylation and in situ cyclization.
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 γ-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.
研究了pyripyropene A (1) 中吡啶-吡喃酮部分的结构-活性关系,pyripyropene A (1) 是一种有效的酰基辅酶A:真菌来源的胆固醇酰基转移酶 (ACAT) 抑制剂。利用独特的降解反应,然后进行γ-酰化,合成了吡啶部分的几种芳香族或杂环取代基。所有六种合成的类似物均降低了抑制活性,IC50值比1大20至200倍。此外,吡啶-吡喃酮取代基也显着降低了抑制活性。因此,吡啶-吡喃酮部分对于引发有效的 ACAT 抑制非常重要。