Trimethylsilyl Trifluoromethanesulfonate as a Metal-Free, Homogeneous and Strong Lewis Acid Catalyst for Efficient One-Pot Synthesis of α-Aminonitriles and Their Fluorinated Analogues
Trimethylsilyl Trifluoromethanesulfonate as a Metal-Free, Homogeneous and Strong Lewis Acid Catalyst for Efficient One-Pot Synthesis of α-Aminonitriles and Their Fluorinated Analogues
One-pot three-component Strecker reaction of ketones/fluorinated ketones for the preparation of α-aminonitriles/fluorinated α-aminonitriles has been achieved using trimethylsilyl trifluoromethanesulfonate [(CH3)3SiOSO2CF3, TMSOTf)] as a metal-free strong Lewis acid catalyst. These reactions are simple and clean, giving the products in high yield and high purity. α-Aminonitriles and their fluorinated analogues are important classes of compounds, which show interesting pharmaceutical and biological properties. Presence of fluorine atom increases their biological activities significantly.
Nafion–Fe: A New Efficient “Green” Lewis Acid Catalyst for the Ketonic Strecker Reaction
作者:G. K. Surya Prakash、Inessa Bychinskaya、Eric R. Marinez、Thomas Mathew、George A. Olah
DOI:10.1007/s10562-012-0958-2
日期:2013.4
yields and high purity by the Streckerreaction from ketones, aliphatic/aromatic amines and TMSCN using a new “green” Lewis acid catalyst, Nafion–Fe (iron Nafionate, Fe(III) salt of Nafion–H, a solid polymeric perfluoroalkanesulfonic acid) under conventional thermal as well as microwave conditions. Microwave and solvent-free conditions applied in this method shorten the reaction times, improve the yields