A convenient approach to δ-amino-β-ketoesters by vinylogous Mannich reaction of masked acetoacetates
                                
                                    
                                        作者:Rosaria Villano、Maria Rosaria Acocella、Antonio Massa、Laura Palombi、Arrigo Scettri                                    
                                    
                                        DOI:10.1016/j.tet.2007.09.073
                                    
                                    
                                        日期:2007.12
                                    
                                    SiCl4 is an efficient and selective catalyst for the vinylogous Mannich reaction of linear and cyclic synthetic equivalents of acetoacetate dianion, leading to delta-amino-beta-ketoesters in moderate to high yields and complete gamma-selectivity; anti-diastereoselectivity was observed by using a gamma-methyl-substituted cyclic silyloxydiene. (c) 2007 Elsevier Ltd. All rights reserved.