Efficient palladium‐catalyzedcross‐coupling reactions of the internal olefinsα‐cyanoketenedithioacetals with a variety of olefins were achieved in dioxane/HOAc/DMSO (9:3:1 v/v/v) under air atmosphere or by means of AgOAc as the terminal oxidant. Electron‐deficient terminal olefins reacted to form the linear diene derivatives with air as the oxidant. Styrenes underwent the cross‐coupling to give both
在二恶烷/ HOAc / DMSO(9:3:1 v / v / v)中或在空气中或通过AgOAc的方式,在内部空气中钯催化的α-氰基碳烯二硫缩醛与各种烯烃的高效交叉偶联反应得以实现。 终端氧化剂。缺电子的末端烯烃与空气反应形成线性二烯衍生物。当使用AgOAc作为氧化剂时,苯乙烯会进行交叉偶联,以生成直链和支链的二烯。未活化的环状和线性内烯烃底物都在空气中催化量的苯醌存在下反应,生成跳过的二烯。X射线晶体学在结构上证实了典型产品。
Experimental and theoretical study of I<sub>2</sub>-catalyzed dialkenyl oxindoles synthesis from isatins and α-cyano ketene ethylene dithioacetal
synthesis of dialkenyl oxindoles from isatins and α-cyano ketene ethylene dithioacetal is described. Both electron-withdrawing groups (EWGs) and alkylthio groups exert effects on the reactivities of ketenedithioacetals. Density functional theory (DFT) calculations suggested that the highest negative charge density on the α-carbon of α-cyano ketene ethylene dithioacetal and the largest positive charge