Strecker reactions with hexacyanoferrates as non-toxic cyanide sources
作者:Caroline Grundke、Till Opatz
DOI:10.1039/c9gc00720b
日期:——
The Strecker reaction is the most widely applied three-component reaction. Although highly useful for the preparation of α-amino nitriles, α-amino acids, hydantoins and numerous related compounds, the need for the application of toxic sources of HCN limits its application in both academic and industrial settings. Here, we present a facile protocol for Strecker reactions using a mixture of potassium
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.
An in-based 3D metal-organic framework as heterogeneous Lewis acid catalyst for multi-component Strecker reactions
作者:Juan Chai、Ping Zhang、Jianing Xu、Hui Qi、Jing Sun、Shubo Jing、Xiaodong Chen、Yong Fan、Li Wang
DOI:10.1016/j.ica.2018.04.037
日期:2018.7
A novel three-dimensional metal-organic framework (MOF) [In3(NIPH)(3) (HNIPH)(OH)(2)].4H(2)O}(n) (1) (H2NIPH = 5-nitroisophthalic acid) with one-dimensional channels was synthesized and structurally characterized. Importantly, it demonstrates excellent catalytic activity for the Strecker reactions of two or three components under mild conditions. Moreover, the catalytic recycling of 1 as a representative example was explored. It can be easily separated and reused for no less than five runs with more than 80% conversion yield in catalytic ability.