Cu(ii)-catalyzed C–H (SP3) oxidation and C–N cleavage: base-switched methylenation and formylation using tetramethylethylenediamine as a carbon source
作者:Lei Zhang、Chen Peng、Dan Zhao、Yue Wang、Hai-Jian Fu、Qi Shen、Jian-Xin Li
DOI:10.1039/c2cc32009f
日期:——
Base-switched methylenation and formylation using tetramethylethylenediamine (TMEDA) as a carbon source have been achieved under mild conditions, catalyzed by CuCl(2), with atmospheric oxygen as oxidant. Bisindolylmethanes, diphenylmethanes and 3-formylindoles were synthesized with excellent regioselectivity and good yield.
Copper(ii)-catalyzed C–H (sp3) oxidation and C–N cleavage: synthesis of methylene-bridged compounds using TMEDA as a carbon source in water
作者:Dan Zhao、Yue Wang、Min-Xue Zhu、Qi Shen、Lei Zhang、Yun Du、Jian-Xin Li
DOI:10.1039/c3ra40695d
日期:——
A green, simple, and efficient protocol for the selective methylenation via CuCl2/oxygen-mediated CâH (sp3) oxidation and CâN cleavage using tetramethylethylenediamine (TMEDA) as a carbon source has been developed. The reactions were achieved in green solvent water under atmospheric conditions. The protocol exhibited a broad substrate scope including indoles, anilines, pyrroles and 1,3-dicarbonyls. Furthermore, two key intermediates of the reaction were successfully identified and the mechanism was explored.
A novel, green and efficient method is developed for the synthesis of methylene bridged bis(indolyl)methanes in good to excellent yields. The reaction employs methyl tert-butyl ether (MTBE) as the methylene source and selectfluor as an oxidizing agent. The scope and versatility of the methods have been successfully demonstrated with 48 examples. The metal-free transformation process is suitable for