Scope and limitations of the alkylidene carbene 1,5-CH insertion reactions of α-amino acid-derived substrates
                                
                                    
                                        作者:Renameditswe Mapitse、Christopher J Hayes                                    
                                    
                                        DOI:10.1016/s0040-4039(02)00585-3
                                    
                                    
                                        日期:2002.5
                                    
                                    A range of alpha-amino acid-derived cyclisation precursors were synthesised from suitably protected alpha-amino esters, via a Dibal-H/Wittig/catalytic hydrogenation strategy and each of these was subjected to alkylidene carbene-forming conditions (lithio(trimethylsilyl)diazomethane, THF). The cyclisations proceeded in poor to good yield, with the best cyclisations occurring to produce spirocyclic products. (C) 2002 Published by Elsevier Science Ltd.