Enantioselective Organo-Photocatalysis Mediated by Atropisomeric Thiourea Derivatives
作者:Nandini Vallavoju、Sermadurai Selvakumar、Steffen Jockusch、Mukund P. Sibi、Jayaraman Sivaguru
DOI:10.1002/anie.201310940
日期:2014.5.26
this, organo‐photocatalysts that are based on atropisomeric thioureas and display lower excited‐state energies than the reactive substrates have been developed. These photocatalysts were found to be efficient in promoting the [2+2] photocycloaddition of 4‐alkenyl‐substituted coumarins, which led to the corresponding products with high enantioselectivity (77–96 % ee) at low catalyst loading (1–10 mol %)
可以在没有电子或能量转移的情况下进行光催化吗?为了解决这个问题,已经开发了基于对映异构体硫脲的有机光催化剂,并且其激发态能量比反应性底物低。这些光催化剂被发现可以有效地促进4-烯基取代的香豆素的[2 + 2]光环加成反应,从而导致相应的产物在低催化剂负载量(1-10 mol%)下具有高对映选择性(77-96% ee)。 )。通过形成静态和动态配合物(激态配合物)来进行能量共享,从而进行光催化循环,这借助氢键来实现。