Abstract Alkyl 2-mercaptophenyl ketones react with trifluoroacetic anhydride in the presence of triethylamine to give 2-(trifluoromethyl)-4H-thiochromen-4-ones, which are transformed into the corresponding pyrazoles by treatment with hydrazine hydrate and into 1,1-dioxides by oxidation with H2O2 in AcOH.
摘要 烷基 2-巯基苯基酮在
三乙胺存在下与
三氟乙酸酐反应生成 2-(三
氟甲基)-4H-thiochromen-4-ones,再经
水合
肼处理转化为相应的
吡唑类化合物和 1,1-二氧化物。用
H2O2 在 AcOH 中氧化。