Treatment of the salt CF3CCLi with alkyl chloroformates affords the compounds CF3CCCO2R (R Et and CH2Ph) in relatively low yield and with gaseous carbon dioxide yields the acid CF3CCCO2H. Reaction of the acid with diazomethane gives the methyl ester which, with an excess of the reagent, undergoes regiospecific 1,3-dipolar cycloaddition to produce 3-carbomethoxy-4- trifluoromethylpyrazole and hence
该盐的治疗CF 3 CCLi与
氯甲酸烷基
酯,得到化合物CF 3 CCCO 2 - [R(R的Et和CH 2 PH)在相对低的产率和用气态
二氧化碳产生的酸CF 3 CCCO 2 ħ酸与
重氮甲烷反应生成甲
酯,该甲
酯与过量的试剂进行区域特异性的1,3-偶极环加成反应,生成3-carbomethoxy-4-trifluoromethylpyrazole,从而生成3-carbomethoxy-4-trifluoromethylpyrazole,从而生成3-和5-carbomethoxy-1-methyl -4-三
氟甲基吡唑。醇CF
氧化3 CCCH(OH)Ph(上活性的MnO 2)提供了70:23的3-
苯甲酰基-
2,4-双(三
氟甲基)-2-羟基-6-
苯基-α-
吡喃和E-1,3-二
苯甲酰基-2-三
氟甲基丙烯的混合物(通过
酮CF 3 CC
COPh)。