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.
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.