Ghosh B, Bera S, Ghosh P, Samanta R. Rh(III)-Catalyzed mild straightforward synthesis of quinoline-braced cyclophane macrocycles
via migratory insertion.
Chem Commun (Camb) 2021;
57:13134-13137. [PMID:
34807203 DOI:
10.1039/d1cc04418d]
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Abstract
An efficient Rh(III)-catalyzed straightforward strategy is developed for the synthesis of quinoline braced cyclophane macrocycles via methyl (sp3) C-H functionalization. The method is mild, simple and regioselective with various ring sizes and has good functional group tolerance. The method proceeds via C8-methyl metalation, metal-carbene formation and a subsequent migratory insertion. High dilution is not necessary for this macrocyclization and the only byproduct is nitrogen. A preliminary investigation shows that the C-H metalation step is the rate-determining step.
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