Asymmetry induction on the [4C(4π)+3C(2π)] cycloaddition reaction of C2-functionalized furans: influence of the chiral auxiliary nature
                                
                                    
                                        作者:Angel M Montaña、Pedro M Grima                                    
                                    
                                        DOI:10.1016/s0040-4020(02)00452-0
                                    
                                    
                                        日期:2002.6
                                    
                                    The study of the pi-facial diastereoselectivity in the [4+3] cycloaddition reaction of thirteen different chiral 2-substituted furans with oxyallyl cations, under sonochemical and/or thermal conditions, is presented. In almost all studied furans, a cis diastereoselectivity and a high endo diastereoselectivity is observed. Decreasing the distance between the closest stereocenter of the chiral auxiliary and the reactive C2-carbon of the furan ring, increases the pi-facial diastereoselectivity, especially by using chiral furyl-sulfoxides. (C) 2002 Elsevier Science Ltd. All rights reserved.