The Nucleophilic 5-endo-trig Cyclization of 1,1-Difluoro-1-alkenes: Ring-Fluorinated
Hetero- and Carbocycle Synthesis and Remarkable Effect of
the Vinylic Fluorines on the Disfavored Process
The Nucleophilic 5-endo-trig Cyclization of 1,1-Difluoro-1-alkenes: Ring-Fluorinated
Hetero- and Carbocycle Synthesis and Remarkable Effect of
the Vinylic Fluorines on the Disfavored Process
β,β-Difluorostyrenes bearing tosylamido, hydroxy
ormethylsulfinyl groups at the o-position undergo intramol-ecular
substitution of the nitrogen, oxygen or sulfur withloss of fluorine
via a 5-endo-trigonal process leading to2-fluorinated
heterocyclic systems in high yields.