Trifluoromethanesulfonic anhydride → Ethyl 2-ethoxy-4'-fluoro-6-(((trifluoromethyl)sulfonyl)oxy)biphenyl-4-carboxylate
Reaction equation
FC(F)(F)S([O:6][S:7]([C:10]([F:13])([F:12])[F:11])(=[O:9])=[O:8])(=O)=O.[CH2:16]([O:18][C:19]1[CH:24]=[C:23]([C:25]([O:27][CH2:28][CH3:29])=[O:26])[CH:22]=[C:21](O)[C:20]=1[C:31]1[CH:36]=[CH:35][C:34]([F:37])=[CH:33][CH:32]=1)[CH3:17]>N1C=CC=CC=1>[CH2:16]([O:18][C:19]1[CH:24]=[C:23]([C:25]([O:27][CH2:28][CH3:29])=[O:26])[CH:22]=[C:21]([O:6][S:7]([C:10]([F:11])([F:12])[F:13])(=[O:8])=[O:9])[C:20]=1[C:31]1[CH:36]=[CH:35][C:34]([F:37])=[CH:33][CH:32]=1)[CH3:17]Participants
4
Procedure
Trifluoromethanesulfonic anhydride (8.66 mL) was added at 0° C. to a mixture of ethyl 2-ethoxy-4′-fluoro-6-hydroxybiphenyl-4-carboxylate (13.0 g) and pyridine (80 mL), and the resultant mixture was stirred at the same temperature as above for 20 minutes. The reaction mixture was passed through a short silica gel (NH) column, and the solvent was distilled off under reduced pressure. The obtained residue was purified by silica gel column chromatography (hexane/ethyl acetate) to obtain the title compound (15.6 g).