Harnessing sulfur and nitrogen in the cobalt(<scp>iii</scp>)-catalyzed unsymmetrical double annulation of thioamides: probing the origin of chemo- and regio-selectivity
作者:Majji Shankar、Arijit Saha、Somratan Sau、Arghadip Ghosh、Vincent Gandon、Akhila K. Sahoo
DOI:10.1039/d1sc00765c
日期:——
a concept which is uncovered for the first time. The power of the N-masked methyl phenyl sulfoximine (MPS) directing group in this annulation sequence is established. The transformation is successfully developed, building a novel chemical space of structural diversity (56 examples). In addition, the late-stage annulation of biologically relevant motifs and drug candidates is disclosed (17 examples)
提出了一种非常规的钴( III )催化的芳基硫代酰胺与未活化的炔烃的一锅多米诺骨牌双环化反应。芳基硫代酰胺的硫 (S)、氮 (N) 和o , o '-C-H 键参与该反应,从而能够获得稀有的 6,6-稠合硫代吡喃并异喹啉衍生物。硫代酰胺与助催化剂的更传统“N”配位相比,反向“S”配位专门调节了四个[C-C和C-S]键的形成,然后是C-N和C-C]键的形成单一操作,这是首次提出的概念。在此环化序列中,N-掩蔽的甲基苯基亚磺酰亚胺 (MPS) 导向基团的力量已确定。该转化已成功开发,构建了结构多样性的新型化学空间(56 个实例)。此外,还公开了生物学相关基序和候选药物的后期成环(17 个例子)。讨论了吡喃并异喹啉衍生物的初步光物理性质。密度泛函理论 (DFT) 研究证实了 7 元 S 螯合钴环的独特 6π 电环化参与环化过程。