Abstract
A new approach to (+)-cacospongionolide was developed to access conformationally restricted variants of the natural product. The flexible aliphatic region between the decalin and side chain portion of the natural product was replaced with alkenyl and alkynyl linkers to probe the influence of structural rigidity in the inhibition of secretary phospholipase A2 (sPLA2). It was found that when the aliphatic section is replaced with a Z-olefin or an alkyne, sPLA2 inhibitory activity suffered relative to the natural product; however, an E-olefin-containing analogue led to an enhanced activity. These results suggest that preferred sPLA2 binding conformation of the natural product is similar to the geometry of the E-olefin-containing analogue.
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