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.
Four palladium(II) complexes [PdX2(L-N,S)] (X = Cl, Br; L: BzSq = benzyl 8-quinolyl sulfide, PheneSq = phenethyl 8-quinolyl sulfide) were prepared. The crystal structure of [PdCl2(BzSq-N,S)] revealed the presence of an intraligand stacking between the phenyl and quinolyl groups of BzSq. This stacking interaction was confirmed even in Me2SO, MeCN and MeNO2. On the other hand, [PdCl2(PheneSq-N,S)] did not show such an intraligand stacking both in the solid and in solutions. (C) 2002 Published by Elsevier Science Ltd.