A metal-free and mild approach to 1,3,4-oxadiazol-2(3<i>H</i>)-ones <i>via</i> oxidative C–C bond cleavage using molecular oxygen
作者:Bumhee Lim、Seunggun Park、Jae Hyun Park、Jongsik Gam、Sanghee Kim、Jung Woon Yang、Jeeyeon Lee
DOI:10.1039/c7ob03188b
日期:——
A mild metal-free approach to 1,3,4-oxadiazol-2(3H)-ones via 1,3,4-oxadiazin-5(6H)-ones is described. This novel transformation, promoted by the electron-withdrawing p-substituents on the phenyl group at the α-carbonyl position, features a tandem reaction consisting of oxidative hydroxylation and C–C bond cleavage using molecular oxygen. The method utilizes K2CO3 in CH3CN without any oxidants, transition
描述了一种经由1,3,4-恶二嗪-5(6 H)-酮的温和的不含金属的方法制备1,3,4-恶二唑-2(3 H)-酮。这种新颖的转变是由α-羰基位置的苯基上的吸电子对位取代基促进的,具有串联反应,该串联反应由氧化性羟基化和使用分子氧进行的CC键断裂组成。该方法利用CH 3 CN中的K 2 CO 3而不使用任何氧化剂,过渡金属或添加剂,从而可调谐合成1,3,4-恶二嗪-5(6 H)-ones ,1,3,4-恶二唑- 2(3 H)-ones和α-酮酰胺在温和的有氧条件下。