Synthesis of α-aminonitriles under mild catalytic, metal-free conditions
作者:Baskar Nammalwar、Chelsea Fortenberry、Richard A. Bunce
DOI:10.1016/j.tetlet.2013.11.035
日期:2014.1
alpha-Aminonitriles have been synthesized by a Strecker synthesis from aldehydes and ketones under mild catalytic, metal-free conditions. Aromatic aldehydes (1 equiv) were reacted with TMSCN (1 equiv) and aromatic and 1 degrees or 2 degrees aliphatic amines (1 equiv) in EtOH containing 3 mol % of NH4Cl to give high yields of alpha-aminonitriles. An alternative to adding NH4Cl as a catalyst involved the use of excess TMSCN (1.2 equiv) to promote the process. The reaction was also successful under microwave conditions using excess TMSCN with no solvent. Ketones similarly reacted with aromatic amines and excess TMSCN under conventional and microwave heating, but 30 mol % of added NH4Cl was required for optimum conversion. (C) 2013 Elsevier Ltd. All rights reserved.
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