Oxazolidinone/enamine ratios in the reactions of α-silyloxy and α-alkoxy aldehydes with proline
                                
                                    
                                        作者:Dani Sánchez、Alejandro Castro-Alvarez、Jaume Vilarrasa                                    
                                    
                                        DOI:10.1016/j.tetlet.2013.09.073
                                    
                                    
                                        日期:2013.11
                                    
                                    alpha-Silyloxy and alpha-alkoxy aldehydes (propanal derivatives 1-4), when treated with proline in DMSO-d(6), give oxazolidinones rather than enamines. In fact, the relative trend is much stronger than that of all other carbonyl compounds examined, including simple aldehydes, alpha-branched aldehydes, alpha-(alkylthio)aldehydes, and standard ketones. For 1-4, the high prevalence of oxazolidinones prevents or delays the partial racemization of the alpha-stereocenters. (C) 2013 Elsevier Ltd. All rights reserved.