DABCO-Catalyzed Double Cascade Cycloaddition of Maleimides with Bisarylhydrazones: Access to Fused Pyrazolo[5,1-<i>c</i>
][1,2,4]triazole Derivatives
作者:Jia-Nan Zhu、Zhen-Hua Yang、Ming Qi、Sheng-Yin Zhao
DOI:10.1002/adsc.201801260
日期:2019.2.19
A DABCO‐catalyzed double cascade cycloaddition reaction of diverse maleimides with bisarylhydrazones has been developed for the synthesis of a variety of synthetically challenging pyrazolo[5,1‐c][1,2,4]triazole derivatives. Dioxygen gas is employed as the sole oxidant in this transformation. It proceeds with high step‐ and atom‐efficiency and shows a broad substrate scope and functional group tolerance
已经开发了DABCO催化的各种马来酰亚胺与双芳基hydr酮的双级联双环加成反应,用于合成多种具有合成挑战性的吡唑并[5,1– c ] [1,2,4]三唑衍生物。在该转化中,将氧气用作唯一的氧化剂。它具有较高的步长和原子效率,并显示出广泛的底物范围和官能团耐受性,使其成为制备完全取代的吡唑并[5,1– c ] [1,2,4]三唑衍生物的实用方法。