Silver-catalysed intramolecular hydroamination of alkynes with trichloroacetimidates
作者:Valerie H. L. Wong、T. S. Andy Hor、King Kuok (Mimi) Hii
DOI:10.1039/c3cc45500a
日期:——
Silver(I) complexes catalyse the intramolecular addition of trichloroacetimidates to alkynes. In the absence of a ligand, the selectivity of the reaction is dependent upon the nature of the counter-anion and solvent. The introduction of non-chelating nitrogeneous ligands suppresses competitive Brønsted acid catalysis, improving the yield and selectivity of the reaction.
Ligand Effect and Control of<i>E</i>- and<i>Z</i>-Selectivity in the Silver-Catalyzed Synthesis of 4-Bromooxazolines
作者:Valerie H. L. Wong、Andrew J. P. White、T. S. Andy Hor、King Kuok Mimi Hii
DOI:10.1002/adsc.201500157
日期:2015.8.10
The stereospecific intramolecular hydroamination of alkynyl trichloroacetimidates catalyzed by bis(pyridyl)silver(I) complexes to form 1,3‐oxazolines and oxazines has been investigated in greater detail. The rate of the reaction is profoundly influenced by the electronic character of the pyridyl ligand; leading to optimized conditions whereby reactions can be completed at ambient temperature with catalyst