Asymmetric hetero-Diels–Alder reactions. Reactions of oxazolo[3,2- c ]pyrimidines
                                
                                    
                                        作者:Mark C Elliott、Elbertus Kruiswijk、David J Willock                                    
                                    
                                        DOI:10.1016/s0040-4020(01)01032-8
                                    
                                    
                                        日期:2001.12
                                    
                                    Diastereomerically pure oxazolo[3,2-c]pyrimidines can be readily prepared by the reaction of alkenyloxazolines with isocyanates. The mechanism of this transformation has been investigated computationally. These compounds undergo epimerisation upon prolonged heating, a reaction which is consistent with the proposed stepwise mechanism. Hydrolysis reactions of these compounds have been investigated. (C) 2001 Elsevier Science Ltd. All rights reserved.