Chemical and biochemical characterization of lignan analogs as novel PAF receptor antagonists

Various derivatives and isosteres of neolignans of the 2,5-diaryl tetrahydrofuran type have been synthesized as antagonists of platelet-activating factor (PAF). A detailed analysis of their structure-activity relationship (SAR) has revealed a clear preference for an asymmetrical molecular configuration with a high degree of stereo and chiral specificity associated with greater potency. Thetrans-2S,5S enantiomers are generally 10–200 times more potentin vitro than their correspondingcis ortrans-2R,5R isomers. A similar stereochemical preference is indicated by the recently reported PAF antagonist MK-287 which has undergone clinical evaluation. An azido derivative L-662,025 has been characterized as a photolabile irreversible antagonist of PAF for the investigation of solubilized and partially purified PAF binding proteins from cell membranes. The biological justification for concomitant inhibition of both PAF receptor and 5-lipoxygenase in inflammation is well recognized. The feasibility of developing such dual-functional agents has been demonstrated by a group of dithiolane analogs of neolignans and several derivatives of futoenone. Based on a paper presented at the Third International Conference on Platelet-Activating Factor and Structurally Related Alkyl Ether Lipids, Tokyo, Japan, May 1989.