squaramide catalysts (8–15) were synthesized, and their catalytic efficiency in the enantioselective conjugate addition of pyrazolones to nitroalkenes was described. This protocol provides excellent chemical yields (up to 93%) of chiral 5‐methyl‐4‐(2‐nitro‐1‐arylethyl)pyrazol‐3‐ol derivatives with high enantioselectivities (up to 97% ee).
合成了手性方酰胺催化剂(8-15),并描述了它们在
吡唑酮对硝基烯烃的对映选择性共轭加成中的催化效率。该方案可提供具有高对映选择性(高达97%ee)的手性5-甲基-4-(2-硝基-1-芳基乙基)
吡唑-3-醇衍
生物,
化学产率高(高达93%)。