Michael Addition and Oxidative Cross‐Coupling Reaction of α‐Oxo Ketene Dithioacetals and Maleimides: Switchable Synthesis of 3‐Alkenyl Succinimides and Maleimides
作者:Haifeng Yu、Jian Mo、Xuemin Niu、Dashuang Luo、Guangbo Che
DOI:10.1002/adsc.202300559
日期:2023.9.19
Switchable synthesis of 3-alkenyl succinimides and maleimides has been achieved via Michaeladdition and oxidative cross-coupling reaction of α-oxo ketene dithioacetals and maleimides by switching different reaction conditions. In the presence of 30 mol% of CH3SO3H in DCE at 120 °C, Michaeladdition reaction of α-oxo ketene dithioacetals and maleimides occurred to afford 3-alkenyl succinimides in 40–90%
通过切换不同的反应条件,通过迈克尔加成以及α-氧乙烯酮二硫缩醛和马来酰亚胺的氧化交叉偶联反应,实现了3-烯基琥珀酰亚胺和马来酰亚胺的切换合成。在 120 °C 的 DCE 中,存在 30 mol% CH 3 SO 3 H 的情况下,α-氧乙烯酮二硫缩醛和马来酰亚胺发生迈克尔加成反应,生成 3-烯基琥珀酰亚胺,产率为 40-90%,而在30 mol% Pd(OAc) 2在 20 °C 的 DMF 中,α-氧乙烯酮二硫缩醛与马来酰亚胺发生氧化交叉偶联反应,得到 3-烯基马来酰亚胺,产率为 40-80%。在迈克尔加成反应中不需要将基团引导至底物上的预设。该方法可以扩展到克级。
Alternative Palladium-Catalyzed Vinylic C−H Difluoroalkylation of Ketene Dithioacetals Using Bromodifluoroacetate Derivatives
作者:Shuangquan Tian、Xiaoning Song、Dongsheng Zhu、Mang Wang
DOI:10.1002/adsc.201701554
日期:2018.4.3
A palladium‐catalyzedcross‐coupling of α‐oxo ketene dithioacetals and bromodifluoroacetate derivatives has been developed for the synthesis of a class of CF2‐containing tetra‐substituted olefins, which has potential to extend to drug design and material application. The process is proposed to involve two single electron transfer processes accompanied by an alternative loop from palladium(0) to palladium(I)
Annulations of α-Carbamoyl Ketene Dithioacetals with Dicarboxylic Acid Dichlorides: Synthesis of Functionalized Pyrrolidinetriones and Piperidinetriones
作者:Ying Dong、Yaru Guo、Jun Liu、Gang Zheng、Mang Wang
DOI:10.1002/ejoc.201301227
日期:2014.2
annulation strategy based on ketenedithioacetals is described. Under very mild conditions, a number of pyrrolidinetriones 2 and piperidinetriones 3 have been synthesized by the cycloaddition reaction of α-carbamoyl ketenedithioacetals 1 with di-carboxylic acid dichlorides in good to excellent yields. Further application of this protocol is highlighted by the synthesis of a set of fused pyrimidine