A rapid and effective approach to 4-tosyl-4,5-dihydropyrazolo[1,5-a]pyrimidines via copper-catalyzed one-pot cascade transformation of N-propargylic sulfonylhydrazones with sulfonyl azides under mild conditions has been developed. This process relies on the copper-catalyzed azide-alkyne cycloaddition (CuAAC) and intramolecular [4+2] cycloaddition of α,β-unsaturated hydrazone with the in situ generated
一种快速和有效的方法,以4-
甲苯磺酰基-4,5-
二氢吡唑并[1,5-一个]
嘧啶通过
铜催化一锅级联的变换Ñ与温和的条件下
叠氮化物磺酰-propargylic sulfonylhydrazones已经研制成功。此过程依赖于
铜催化的
叠氮化物-
炔烃环加成(Cu
AAC)和α,β-不饱和的分子内[4 + 2]环加成与原位生成的酮
亚胺中间体,从而高效提供有用的双环化产物。