DMSO as a C<sub>1</sub> Source for [2 + 2 + 1] Pyrazole Ring Construction via Metal-Free Annulation with Enaminones and Hydrazines
作者:Haijin Guo、Lihong Tian、Yunyun Liu、Jie-Ping Wan
DOI:10.1021/acs.orglett.1c03879
日期:2022.1.14
between enaminones, hydrazines, and dimethyl sulfoxide (DMSO) for the synthesis of 1,4-disubstituted pyrazoles catalyzed by molecular iodine in the presence of Selectfluor has been realized. DMSO plays a dual role as the C1 source and the reaction medium. In addition, the synthesis of 1,3,4-trisubstituted pyrazoles using aldehydes as alternative C1 building blocks has also been achieved.
已经实现了烯胺酮、肼和二甲亚砜 (DMSO) 之间的级联反应,用于在 Selectfluor 存在下由分子碘催化合成 1,4-二取代吡唑。DMSO作为C 1源和反应介质发挥双重作用。此外,还实现了使用醛作为替代 C 1结构单元的 1,3,4-三取代吡唑的合成。