Preparation of β-Substituted γ-Keto Esters by the Grignard Reaction on N-Acylpyrazoles
                                
                                    
                                        作者:Choji Kashima、Yoshie Shirahata、Yoshihiro Tsukamoto                                    
                                    
                                        DOI:10.3987/com-00-s(i)37
                                    
                                    
                                        日期:——
                                    
                                    Various gamma -keto esters were prepared by either the alcoholysis of N-(4-oxoalkcanoyl)pyrazoles or the Grignard replacement of pyrazole moiety of 4-(N-pyrazolyl)-4-oxoalkanoic esters. By using 3-phenyl-l-menthopyrazole as a chiral auxiliary, beta -substituted gamma -keto esters were enantioselectively obtained.