Design and synthesis of benzo-lipoxin A4 analogs with enhanced stability and potent anti-inflammatory properties
摘要:
A new class of chemically and metabolically stable lipoxin analogs featuring a replacement of the tetraene unit of native LXA(4) with a substituted benzo-fused ring system have been designed and studied. These molecules were readily synthesized via a convergent synthetic route involving iterative palladium-mediated cross-coupling, and exhibit enhanced chemical stability, as well as resistance to metabolic inactivation via eicosanoid oxido-reductase. These new LX analogs were evaluated in a model of acute inflammation and were shown to exhibit potent anti-inflammatory properties, significantly decreasing neutrophil infiltration in vivo. The most potent among these was compound 9 (o-[9,12]-benzo-15-epi-LXA(4) methyl ester. Taken together, these findings help identify a new class of stable and easily prepared LX analogs that may serve as novel tools and as promising leads for new anti-inflammatory agents with improved therapeutic pro. le. (c) 2008 Elsevier Ltd. All rights reserved.
strategies were necessary to bring the individual members of the aspercyclide family into reach. Whereas the strained eleven‐membered ring of aspercyclide C (see figure) could be closed by RCM, it required the power of organochromium chemistry (Nozaki–Hiyama–Kishi reaction) to forge the frame of its sterically even more hindered congener aspercyclide B.