Regioselective reaction of fluorinated aryllithium reagents and carbon disulfide in cyclopentyl methyl ether: Efficient synthesis of dithioesters and liquid crystal compounds having a difluoromethyleneoxy moiety
Regioselective reaction (carbophilic over thiophilic attack) of several (o-fluorophenyl)lithium reagents with carbon disulfide was achieved to furnish dithioesters in good yields after alkylation, which are useful precursors of liquid crystal compounds having a difluoromethyleneoxy (-CF2O-) group. Running the reaction in the presence of a copper(I) salt catalyst and cyclopentyl methyl ether as a solvent