Michael Addition and Oxidative Cross‐Coupling Reaction of α‐Oxo Ketene Dithioacetals and Maleimides: Switchable Synthesis of 3‐Alkenyl Succinimides and Maleimides
Haifeng Yu, Jian Mo, Xue-Min Niu, Dashuang Luo, guangbo che
Abstract
Abstract Switchable synthesis of 3‐alkenyl succinimides and maleimides has been achieved via Michael addition and oxidative cross‐coupling reaction of α‐oxo ketene dithioacetals and maleimides by switching different reaction conditions. In the presence of 30 mol% of CH 3 SO 3 H in DCE at 120 °C, Michael addition reaction of α‐oxo ketene dithioacetals and maleimides occurred to afford 3‐alkenyl succinimides in 40–90% yields, whereas in the presence of 30 mol% of Pd(OAc) 2 in DMF at 20 °C, 3‐alkenyl maleimides were obtained in 40–80% yields from the oxidative cross‐coupling reaction of α‐oxo ketene dithioacetals with maleimides. The presupposition of directing groups onto the substrates is not required in the Michael addition reaction. The method can be extended to gram scale.