1,3-Dimethyl-2-ethoxycarbonyl-1-(trifluoromethyl)cyclohex-4-ene is prepared by the cycloadditionof 1,1,1-trifluoro-2-methyl-2-butenoic acid ethyl ester with 1,3-pentadiene.The dienophile is prepared by the reaction of CF3C(O)CH3 with BrCH2C(O)OC2H5 in thepresence of (C6H5)3Sb or (C6H5)3As. An extension of this procedure to hexafluoroacetonehas provided 1,1,1-trifluoro-2-hydroxy-2-(trifluoromethyl)-4-butanoic
通过将1,1,1-三
氟-
2-甲基-2-丁烯酸乙酯与1,3-
戊二烯环加成来制备1,3-二甲基-2-乙氧基羰基-1-(三
氟甲基)环己-4-烯。通过在(C 6 H 5)3 Sb或(C 6 H 5)3 As存在下CF 3 C(O)CH 3与BrCH 2 C(O)OC 2 H 5反应制备亲二烯体。将该方法扩展为
六氟丙酮,得到了1,1,1-三
氟-2-羟基-2-(三
氟甲基)-4-
丁酸乙酯。