Ruthenium(ii)-catalyzed synthesis of indazolone-fused cinnolines via C-H coupling with diazo compounds.
Authors of this article are:
Su L Yu Z Ren P Luo Z Hou W Xu H.
A summary of the article is shown below:
A robust, efficient and scalable method for the synthesis of 12H-indazolo[2,1-a]cinnolin-12-ones was developed. Significantly, a less developed cationic complex [Ru(p-cymene)(MeCN)3(SbF6)2] was found to be effective for this transformation. In this reaction, a tandem pathway of C-H ruthenation, Ru(ii)-carbene formation, migratory insertion and condensation was involved. The results of a primary mechanistic study suggested that the C-H activation process might follow an electrophilic-type metalation/deprotonation mechanism.
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