reported here the low loading porphyrin-inspired high-valent manganese (IV)-oxo complex was applied in oxidative kineticresolution (OKR) of racemic heterocyclic sulfoxides using the environmentally benign hydrogen peroxide for the first time. This approach allows for rapid OKR (0.5 h) of a variety of racemic sulfoxides (including pyridine, pyrimidine, pyrazine, thiazole, benzothiazole, thiophene) in
manganese-catalyzed sulfoxidation. On the basis of the theoretical study, the coupled high-valent manganese(IV)–oxo cationradical species, which bears obvious similarities with that of reactive intermediates in the catalytic oxygenation reactions based on the cytochrome P450 and metalloporphyrin models, has been proposed as the reactive oxidant in the non-heme manganese catalyst system.
锰复合物与卟啉样配体,其催化的杂芳硫化物,包括咪唑,苯并咪唑,吲哚,吡啶,嘧啶,吡嗪,的高度化学选择性和对映选择性氧化符号嗪,噻吩,噻唑,苯并噻唑,苯并恶唑和,与过氧化氢如描述的那样,在短的反应时间(0.5h)内以良好至优异的产率和对映选择性(高达90%产率和高达> 99%ee)提供相应的亚砜。该方法的实际实用性已在克规模的手性亚砜的合成中得到证明。用18 O标记水(H 2 18 O),过氧化氢(H 2 18 O 2)和氢过氧化枯基表明,通过羧酸协助的O-O键杂化作用,生成了高价的锰-氧代氧离子作为氧原子传递剂。还进行了密度泛函理论(DFT)计算,以进一步了解锰催化的硫氧化机理。在理论研究的基础上,提出了基于细胞色素P450和金属卟啉模型的高价锰(IV)-氧代阳离子自由基与催化氧化反应中的反应中间体具有明显相似性的化合物。非血红素锰催化剂体系中的活性氧化剂。