The nucleophilic 5-endo-trig cyclization of gem-difluoroolefins with homoallylic functional groups: syntheses of ring-fluorinated dihydroheteroaromatics
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