Benzofurans and benzothiophenes have been efficiently employed as substrates in an enantioselective intramolecular hydroacylation. Breaking aromaticity in a 5-exo-trig cyclization of easily accessible heteroarenes by NHC-catalyzed hydroacylation gives access to a simple class of mainly unexplored spirocycles with up to 99% enantiomeric excess (ee). The formed product class bears interesting three-dimensional
苯并呋喃和
苯并噻吩已有效地用作对映选择性分子内加氢酰化的底物。在5-断裂芳香外型-三角函数通过NHC催化加氢酰化方便杂
芳烃环化给出了高达99%的对映体过量(获得一个简单的类主要未知螺环的EE)。所形成的产物类别具有有趣的三维伪轴手性,并显示出典型的酮反应性。密度泛函理论(DFT)计算通过带有异质Wheland中间体的逐步机理揭示了ee的腐蚀。理论数据与
氘标记研究以及电子学(σ)和ee之间的线性相关性一致。