α-diazo pyrazoleamides with thioketones is presented, catalyzed by chiral N,N′-dioxide/CoΙΙ complexes. This method provides a rapid and facile access to a series of optically active tetrasubstituted thiiranes with good outcomes (up to 99 % yield, 97 % ee). The origin of stereoselectivity was well elucidated by DFT calculations.
介绍了 α-重氮
吡唑酰胺与
硫酮的催化对映选择性 (2+1) 环加成的第一个例子,由手性N,N'-二氧化物/Co III配合物催化。该方法提供了一种快速、方便地获得一系列具有良好结果的光学活性四取代
硫杂丙环(高达 99% 的产率,97% ee)。DFT 计算很好地阐明了立体选择性的起源。