Catalytic Oxidative Carbonylation of Arylamines to Ureas with W(CO)6/I2 as Catalyst
作者:Li Zhang、Ampofo K. Darko、Jennifer I. Johns、Lisa McElwee-White
DOI:10.1002/ejoc.201100657
日期:2011.11
was carried out by using W(CO)6 as the catalyst, I2 as the oxidant, CO as the carbonyl source and 4-(dimethylamino)pyridine (DMAP) as base. The reaction conditions were optimized with respect to different bases, molar ratio of DMAP/iodine, temperature, time, and CO pressure. Various p-substituted arylamines can be converted into the respective symmetrical and unsymmetrical N,N′-disubstituted ureas in
以W(CO)6为催化剂,I2为氧化剂,CO为羰基源,4-(二甲氨基)吡啶(DMAP)为碱,苯胺氧化羰基化为N,N'-二苯基脲。针对不同的碱、DMAP/碘的摩尔比、温度、时间和CO压力优化反应条件。各种对位取代的芳胺可以以中等至良好的产率转化为相应的对称和不对称 N,N'-二取代脲。该反应表现出广泛的功能耐受性。