Pinpoint-fluorinated phenanthrene synthesis based on CF bond activation of difluoroalkenes
摘要:
Treatment with a cationic palladium(II) catalyst promoted the Friedel-Crafts-type cyclization of 1,1-difluoro-1-alkenes bearing a biphenyl skeleton to afford regioselectively fluorinated (pinpoint-fluorinated) phenanthrenes via C-F bond activation. The obtained pinpoint-fluorinated phenanthrenes were observed to be organized by pi-pi and C-H center dot center dot center dot F interactions to exhibit columnar and layer structures in the solid state. (C) 2015 Elsevier B.V. All rights reserved.
achieved in high yields via the reaction with difluorocarbene. When aryl or alkyl dithiocarboxylates were treated with trimethylsilyl 2,2-difluoro-2-fluorosulfonylacetate in the presence of 5 mol % of a Proton Sponge catalyst, the in situ generated difluorocarbene reacted with the dithioesters to afford 2-sulfanylated 1,1-difluoro-1-alkenes via difluorothiiranes. This reaction can be considered as an electrophilic
Treatment with a cationic palladium(II) catalyst promoted the Friedel-Crafts-type cyclization of 1,1-difluoro-1-alkenes bearing a biphenyl skeleton to afford regioselectively fluorinated (pinpoint-fluorinated) phenanthrenes via C-F bond activation. The obtained pinpoint-fluorinated phenanthrenes were observed to be organized by pi-pi and C-H center dot center dot center dot F interactions to exhibit columnar and layer structures in the solid state. (C) 2015 Elsevier B.V. All rights reserved.
Nucleophilic reactions of trivalent phosphorus compounds. Synthesis of stable difluoromethylenephosphorane analogs.