Radical cyclisation onto C-3 of 1,6-anhydro-β-d-mannopyranose derivatives. Application to the formation of the C8a centre of (−)-tetrodotoxin
                                
                                    
                                        作者:Beatriz Noya、Ricardo Alonso                                    
                                    
                                        DOI:10.1016/s0040-4039(97)00460-7
                                    
                                    
                                        日期:1997.4
                                    
                                    Starting from 1,6-anhydro-beta-D-mannopyranose, compounds 7a-d, which have a ketoxime ether at C3 and a carbon radical precursor tethered to the hydroxyl group at position 2, were efficiently prepared. While alkyl pi-radicals derived from 7a and 7b failed to cyclize, the vinyl sigma-radicals derived from 7c and 7d underwent the desired 1,5-exo cyclization, affording advanced precursors of (-)-tetrodotoxin. This type of transformation should be useful for the formation of sterically crowded nitrogen-bearing carbon centers in carbohydrate-derived substrates. (C) 1997 Elsevier Science Ltd.