An efficient Lewis base catalytic protocol to biologically important trifluoromethylated pyrazolines and pyrazoles is developed through [3+2] triazene-heterocycilc alkene cycloaddition reactions of an array of oxa-/aza-benzonorbornadienes and coumarins with CF3CHN2. This approach features good functional group tolerance and scaffold diversity. Synthetic utility of the protocol is highlighted by late-stage
通过一系列氧杂-/氮杂-苯并降
冰片二烯和
香豆素与CF 3 CHN 2 的[3+2] 三氮杂-杂环烯烃环加成反应,开发了一种对
生物学上重要的三
氟甲基化
吡唑啉和
吡唑的有效路易斯碱催化方案。这种方法具有良好的官能团耐受性和支架多样性。已知
天然产物的后期功能化突出了该协议的合成效用。