Heck-type 5-endo-trig cyclizations promoted by vinylic fluorines: Ring-fluorinated indene and 3H-pyrrole syntheses from 1,1-difluoro-1-alkenes
摘要:
Arylpalladium or aminopalladium species bearing a 2,2-difluorovinyl group undergo an unusual 5-endo alkene insertion followed by beta-fluorine elimination. These processes provide a facile access to ring-fluorinated five-membered carbocyclic and heterocyclic compounds starting from an o-(3,3-difluoroallyl)phenyl trifluoromethanesulfonate and 3,3-difluoroallyl ketone O-pentafluorobenzoyloximes. In both systems, the two vinylic fluorine atoms are essential for Heck-type 5-endo-trig cyclizations. (C) 2006 Elsevier B.V All rights reserved.
Heck-type 5-endo-trig cyclizations promoted by vinylic fluorines: Ring-fluorinated indene and 3H-pyrrole syntheses from 1,1-difluoro-1-alkenes
摘要:
Arylpalladium or aminopalladium species bearing a 2,2-difluorovinyl group undergo an unusual 5-endo alkene insertion followed by beta-fluorine elimination. These processes provide a facile access to ring-fluorinated five-membered carbocyclic and heterocyclic compounds starting from an o-(3,3-difluoroallyl)phenyl trifluoromethanesulfonate and 3,3-difluoroallyl ketone O-pentafluorobenzoyloximes. In both systems, the two vinylic fluorine atoms are essential for Heck-type 5-endo-trig cyclizations. (C) 2006 Elsevier B.V All rights reserved.
Heck-type 5-endo-trig cyclizations promoted by vinylic fluorines: Ring-fluorinated indene and 3H-pyrrole syntheses from 1,1-difluoro-1-alkenes
作者:Junji Ichikawa、Kotaro Sakoda、Jun Mihara、Naotaka Ito
DOI:10.1016/j.jfluchem.2005.12.023
日期:2006.5
Arylpalladium or aminopalladium species bearing a 2,2-difluorovinyl group undergo an unusual 5-endo alkene insertion followed by beta-fluorine elimination. These processes provide a facile access to ring-fluorinated five-membered carbocyclic and heterocyclic compounds starting from an o-(3,3-difluoroallyl)phenyl trifluoromethanesulfonate and 3,3-difluoroallyl ketone O-pentafluorobenzoyloximes. In both systems, the two vinylic fluorine atoms are essential for Heck-type 5-endo-trig cyclizations. (C) 2006 Elsevier B.V All rights reserved.