photoredox‐mediated C(sp3)−H activation through radical translocation can be combined with asymmetric catalysis. Upon irradiation with visible light, α,β‐unsaturated N‐acylpyrazoles react with N‐alkoxyphthalimides in the presence of a rhodium‐based chiral Lewis acid catalyst and the photosensitizer fac‐[Ir(ppy)3] to provide a C−C bond‐formation product with high enantioselectivity (up to 97 % ee) and, where applicable
这项工作证明了光氧化还原介导的C(sp 3)-H通过自由基易位活化可以与不对称催化结合。在可见光照射下,在
铑基手性
路易斯酸催化剂和光敏剂fac- [Ir(ppy)3 ]存在下,α,β-不饱和N-酰基
吡唑与N-烷氧基邻苯二甲
酰亚胺反应以提供C-C键具有高对映选择性(高达97%ee)和适度非对映选择性(3.0:1 dr)的形成产物。从机理上讲,合成策略利用了从氧中心到碳中心的自由基的易位(1,5-氢转移),以及随后的立体控制的自由基烯烃的加成。