摘要:
                                A novel glycosphingolipid, P-D-GalNAcp(l -> 4)[alpha-D- Fucp(1 -> 3)]-beta-D-GIcNAcp(1 -> 3)Cer(1), isolated from the marine sponge Aplysinella rhax, has a unique structure, with D-fucose and N-acetyl-D-galactosamine attached to a reducing-end N-acetyl-D-glucosamine through an alpha 1 -> 3 and beta 1 -> 4 linkage, respectively. We synthesized glycolipid analogues carrying a 2-branched fatty alkyl residue or a 2-trimethylsilyl ethyl residue in place of ceramide (2 and 3), non-natural type trisaccharide analogue containing an L-fucose residue (4), and other analogues (5 and 6). Among these prepared compounds, 2 showed the most potent nitric oxide (NO) production inhibitory activity against LPS-activated J774.1 cells. In addition, their structure-activity relationships were established. (c) 2007 Elsevier Ltd. All rights reserved.