Nature 对氢化酶活性位点的设计指导了限制或逆转空气敏感、贱金属催化剂在与外来 O2 接触时析氢/氧化反应的降解的策略。[NiFeS]-H2ase 中的氧对硫的亲和力和 [NiFeSe]-H2ase 中的硒在有氧条件下产生含氧硫属元素,并通过维持活性位点的 NiFe 核心结构来延迟对金属的不可逆氧损伤。在试图确定 S 位氧吸收的控制特征时,相关的 Ni(µ-EPhX)(µ-S'N2)Fe (E = S 或 Se, Fe = (η5-C5H5)FeII(CO)) 配合物是通过苯环上的对位取代基(X = CF3、Cl、H、OMe、NMe2)进行电子调节,并在 Ni 和 Fe 之间的通讯、氧化还原电位和化学反应性方面进行了比较。O2 对 S-和 Se-氧化的研究发现硫属元素的单和双 O 原子吸收导致 4 元核 Ni(µ-EPhX)(µ-S'N2)Fe 转化为5 元 Ni-OE-Fe-S' 排列,其中
Iron-catalyzed tandem reaction of C–Se bond coupling/selenosulfonation of indols with benzeneselenols
作者:Senling Guan、Yue Chen、Hongjie Wu、Runsheng Xu
DOI:10.1039/d0ra05922f
日期:——
An iron-catalyzed tandem reaction of C–Se bond coupling/selenosulfonation was developed. Starting from sample indols and benzeneselenols versatile biologically active 2-benzeneselenonyl-1H-indoles derivatives were efficiently synthesized. The reaction mechanism was studied by the deuterium isotope study and in situ ESI-MS experiments. This protocol features mild reaction conditions, wider substrate
Diselenide-Mediated Catalytic Functionalization of Hydrophosphoryl Compounds
作者:Handoko、Zacharia Benslimane、Paramjit S. Arora
DOI:10.1021/acs.orglett.0c01858
日期:2020.8.7
We report a diaryldiselenide catalyst for cross-dehydrogenative nucleophilic functionalization of hydrophosphoryl compounds. The proposed organocatalytic cycle closely resembles the mechanism of the Atherton–Todd reaction, with the catalyst serving as a recyclable analogue of the halogenating agent employed in the named reaction. Phosphorus and selenium NMR studies reveal the existence of a P–Se bond