Asymmetric Total Synthesis of 19,20-Epoxydocosapentaenoic Acid, a Bioactive Metabolite of Docosahexaenoic Acid
作者:Maris A. Cinelli、Kin Sing Stephen Lee
DOI:10.1021/acs.joc.9b02378
日期:2019.12.6
In this study, we report the first asymmetric totalsynthesis of 19,20-epoxydocosapentaenoic acid (19,20-EDP), a naturally occurring bioactive cytochrome P450 metabolite of docosahexaenoic acid, a major constituent of fish oil. Our strategy involves direct asymmetric epoxidation to produce an enantiopure β-epoxyaldehyde that can be appended to the rest of the skipped polyene core by Wittig condensation
Endocannabinoids are endogenous polyunsaturated fatty acids involved in a multitude of health and disease processes. Recently, several lines of evidence suggest the presence of a novel non-CB1/CB2 anandamide receptor in endothelial cells. Thus, we synthesized two types of photoaffinity probes that contain either an arylazide group or a diazirin moiety, together with a fluorescent analogue. The key steps rely on selective hydrogenation of skipped tetrayne backbones and on copper-mediated cross-coupling reactions between diynic precursors. Three synthetic routes were investigated. In biological functional assays, we found that both the arylazide and the fluorescent probes induced robust increases in matrix metalloprotease activity and produced positive angiogenic responses in in vitro endothelial cell tube formation assays. Irradiation of the arylazide probe nicely enhanced this effect in both HUVEC and CBI-KO HUVEC. These results suggest that the arylazide and the fluorescent probes can be used to identify "non-C131/CB2 anandamide receptor" from endothelial cells.