R. Obata et al., NEW ANALOGS OF THE PYRIPYROPENE FAMILY OF ACAT INHIBITORS VIA ALPHA-PYRONE FRAGMENTATION AND GAMMA-ACYLATION CYCLIZATION/, Chemistry Letters, (9), 1997, pp. 935-936
The pyridine moiety of pyripyropene A was replaced with other aromatic
and heteroaromatic substituents via alpha-pyrone degradation followed
by dienolate gamma-acylation and in site cyclization.