Ligand-Free, Quinoline N-Assisted Copper-Catalyzed Nitrene Transfer Reaction To Synthesize 8-Quinolylsulfimides
作者:Xinsheng Xiao、Sanping Huang、Shanshan Tang、Guokai Jia、Guangchuan Ou、Yangyan Li
DOI:10.1021/acs.joc.9b00281
日期:2019.6.21
An efficient copper-catalyzed, quinolyl N-directed nitrene transferreaction to 8-quinolylsulfides was described. A variety of 8-quinolylsulfimides with different functional groups were synthesized in moderate to high yields. The obtained 8-quinolylsulfimides were proved to be promising novel type of bidentate ligands in Pd(II)-catalyzed allylic alkylation.
We first report the direct ortho C–Hamidation of arenes with azides by using a novel and inexpensive RuHCl(CO)(PPh3)3 catalyst. The reaction proceeds efficiently in high yield over a broad range of substrates without requirement of any additional silver salt or additive.
Cobalt (II) complexes of porphyrins are effective catalysts for intramolecular nitrene insertion of C—H bonds with arylsulfonyl azides. The cobalt-catalyzed process can proceed efficiently under mild and neutral conditions in low catalyst loading without the need of other reagents or additives, generating nitrogen gas as the only byproduct. Using the simple tetraphenylporphyrin (TPP) as the ligand, the cobalt-catalyzed intramolecular amidation can be applied to primary, secondary, and tertiary C—H bonds and suitable for a broad range of arylsulfonyl azides, leading to the syntheses of various benzosultam derivatives in excellent yields