The regio-and stereoselective addition of carbon nucleophiles to trifluoromethyl phenylsulfanyl acetylene: a novel and expeditious approach to 3-trifluoromethyl furans
A convenient generation of trifluoromethyl phenylsulfanyl acetylene was realized from 2- bromo-1-phenylsulfanyl-3, 3, 3-trifluoropropene. The reagent was reacted with carbanions to give (1E, 3E)-2-trifluoromethylbutadienyl phenyl sulfides regio-and stereoselectively, which underwent intramolecular cyclization in decalin at 190° C or in acetic acid with 1, 4- benzoquinone and sodium acetate to afford 3-trifluoromethyl-substituted furans in high ...