名称:
                                Preparation of methylenedifluorocyclopropanes via cyclopropyl anion promoted β-elimination
                             
                            
                                摘要:
                                Preparation of methylenedifluorocyclopropanes 2 through the beta-elimination reaction promoted by difluorocyclopropyl anion formed by cleavage of C-Si bond with TBAF is described. Base-catalyzed isomerization of 2 to difluorocyclopropene 11 shows the latter structure thermodynamically more stable in contrast to non-fluorinated cases. Application of this method to the synthesis of methylenedifluorocyclopropylglycine (F(2)MCPG) derivative 17 is also presented. (C) 1999 Elsevier Science Ltd. All rights resented.
                             
                                                            
                                    DOI:
                                    10.1016/s0040-4020(99)00588-8